List of Historic Civil Engineering Landmarks

The following is a list of Historic Civil Engineering Landmarks as designated by the American Society of Civil Engineers since it began the program in 1964. The designation is granted to projects, structures, and sites in the United States (National Historic Civil Engineering Landmarks) and the rest of the world (International Historic Civil Engineering Landmarks). As of 2019, there are over 280 landmarks that have been approved by the ASCE Board of Direction.^[1]^[2]^[3]^[4] Sections or chapters of the American Society of Civil Engineers may also designate state or local landmarks within their areas; those landmarks are not listed here.

Ref#	Year designated	Name	Built	Location Coordinates	Region/state	Country	Category
1	1966	Bollman Truss Bridge	1869	Savage 39°8′5.4″N 76°49′30.3″W / 39.134833°N 76.825083°W / 39.134833; -76.825083 (Bollman Truss Bridge)	Maryland	United States	bridges
2	1967	Bidwell Bar Bridge	1856	Oroville 39°32′14.8″N 121°27′15.6″W / 39.537444°N 121.454333°W / 39.537444; -121.454333 (Bidwell Bar Bridge)	California	United States	bridges
3	1967	Erie Canal	1825	Hudson River to Lake Erie 43°2′35.6″N 76°1′20.2″W / 43.043222°N 76.022278°W / 43.043222; -76.022278 (Erie Canal)	New York	United States	water transportation
4	1967	Middlesex Canal	1803	Middlesex County 42°30′21.4″N 71°9′25.8″W / 42.505944°N 71.157167°W / 42.505944; -71.157167 (Middlesex Canal)	Massachusetts	United States	water transportation
5	1968	Central Pacific Railroad	1863–1869	Sacramento eastward 38°34′57″N 121°30′22.8″W / 38.58250°N 121.506333°W / 38.58250; -121.506333 (Central Pacific Railroad)	California	United States	roads & rails
6	1968	Durango-Silverton Branch of the D&RGW RR	1882	Durango 37°35′27.7″N 107°46′41.6″W / 37.591028°N 107.778222°W / 37.591028; -107.778222	Colorado	United States	roads & rails
7	1968	Ellicott's Stone	1799	Mobile 30°59′52″N 88°1′21.1″W / 30.99778°N 88.022528°W / 30.99778; -88.022528 (Ellicott's Stone)	Alabama	United States	surveys & maps
8	1968	Acequias of San Antonio	1718	San Antonio 29°19′57.1″N 98°27′41.1″W / 29.332528°N 98.461417°W / 29.332528; -98.461417 (Acequias of San Antonio)	Texas	United States	water supply & control
9	1968	Joining of the Rails - Transcontinental Railroad	1869	Promontory 41°37′4.7″N 112°33′5.8″W / 41.617972°N 112.551611°W / 41.617972; -112.551611	Utah	United States	roads & rails
10	1968	Wheeling Suspension Bridge	1849	Wheeling 40°4′12.8″N 80°43′36.7″W / 40.070222°N 80.726861°W / 40.070222; -80.726861 (Wheeling Suspension Bridge)	West Virginia	United States	bridges
11	1969	Alvord Lake Bridge	1889	San Francisco 37°46′8.4″N 122°27′17.6″W / 37.769000°N 122.454889°W / 37.769000; -122.454889 (Alvord Lake Bridge)	California	United States	bridges
12	1969	Charleston - Hamburg Railroad	1833	Charleston to Hamburg 32°47′22.9″N 79°56′15.8″W / 32.789694°N 79.937722°W / 32.789694; -79.937722 (Charleston - Hamburg Railroad)	South Carolina	United States	roads & rails
13	1970	Ascutney Mill Dam	1834	Windsor 43°28′35″N 72°23′44.5″W / 43.47639°N 72.395694°W / 43.47639; -72.395694 (Ascutney Mill Dam)	Vermont	United States	dams
14	1970	Bridgeport Covered Bridge	1862	Nevada County 39°17′34.2″N 121°11′41.7″W / 39.292833°N 121.194917°W / 39.292833; -121.194917 (Bridgeport Covered Bridge)	California	United States	bridges
15	1970	Cornish–Windsor Covered Bridge	1866, rebuilt 1988	Windsor to Cornish 43°28′25.3″N 72°23′2.1″W / 43.473694°N 72.383917°W / 43.473694; -72.383917 (Cornish–Windsor Covered Bridge)	Vermont and New Hampshire	United States	bridges
16	1970	Frankford Avenue Bridge	1697	Philadelphia 40°2′36.7″N 75°1′14″W / 40.043528°N 75.02056°W / 40.043528; -75.02056 (Frankford Avenue Bridge)	Pennsylvania	United States	bridges
17	1970	Potowmack Canal and Locks	1799	Great Falls 38°59′25.3″N 77°14′58.1″W / 38.990361°N 77.249472°W / 38.990361; -77.249472 (Potowmack Canal and Locks)	Virginia	United States	water transportation
18	1970	Theodore Roosevelt Dam & Salt River Project	1911	33°40′17.9″N 111°9′40.8″W / 33.671639°N 111.161333°W / 33.671639; -111.161333	Arizona	United States	water supply & control
19	1970	Union Canal Tunnel	1828	Lebanon 40°20′58.5″N 76°27′41″W / 40.349583°N 76.46139°W / 40.349583; -76.46139 (Union Canal Tunnel)	Pennsylvania	United States	water transportation
20	1971	Bethlehem Waterworks	1761	Bethlehem 40°37′8.7″N 75°22′58.2″W / 40.619083°N 75.382833°W / 40.619083; -75.382833 (Bethlehem Waterworks)	Pennsylvania	United States	water supply & control
21	1971	Druid Lake Dam	1871	Baltimore 39°19′7″N 76°37′53″W / 39.31861°N 76.63139°W / 39.31861; -76.63139 (Druid Lake Dam)	Maryland	United States	dams
22	1971	Eads Bridge	1874	St. Louis 38°37′44″N 90°10′43.3″W / 38.62889°N 90.178694°W / 38.62889; -90.178694 (Eads Bridge)	Missouri	United States	bridges
23	1971	First Owens River - Los Angeles Aqueduct	1913	Owens Valley 36°58′32.4″N 118°12′38″W / 36.975667°N 118.21056°W / 36.975667; -118.21056	California	United States	water supply & control
24	1971	Mormon Tabernacle	1867	Salt Lake City 40°46′13.6″N 111°53′35.3″W / 40.770444°N 111.893139°W / 40.770444; -111.893139 (Mormon Tabernacle)	Utah	United States	buildings
25	1972	Cabin John Aqueduct	1863	Cabin John 38°58′22″N 77°8′54.9″W / 38.97278°N 77.148583°W / 38.97278; -77.148583 (Cabin John Aqueduct)	Maryland	United States	water supply & control
26	1972	Chesbroughs Water Supply System Chicago	1869	Chicago 41°53′49.8″N 87°37′27.9″W / 41.897167°N 87.624417°W / 41.897167; -87.624417	Illinois	United States	water supply & control
27	1972	Brooklyn Bridge	1883	New York City 40°42′22″N 73°59′48.8″W / 40.70611°N 73.996889°W / 40.70611; -73.996889 (Brooklyn Bridge)	New York	United States	bridges
28	1972	Gunnison Tunnel	1909	Montrose 38°29′36″N 107°43′17″W / 38.49333°N 107.72139°W / 38.49333; -107.72139 (Gunnison Tunnel)	Colorado	United States	tunnels
29	1972	Roebling's Delaware Aqueduct of the Delaware & Hudson Canal	1848, restored 1983	Lackawaxen to Minisink Ford 41°28′57.5″N 74°59′4.1″W / 41.482639°N 74.984472°W / 41.482639; -74.984472	Pennsylvania & New York	United States	water transportation
30	1972	Miami Conservancy District	1922	near Dayton 39°45′49.2″N 84°11′29.2″W / 39.763667°N 84.191444°W / 39.763667; -84.191444 (Miami Conservancy District)	Ohio	United States	water supply & control
31	1973	Buffalo Bill Dam	1910	Cody 44°30′5.3″N 109°10′59.4″W / 44.501472°N 109.183167°W / 44.501472; -109.183167 (Buffalo Bill Dam)	Wyoming	United States	dams
32	1973	Cheesman Reservoir	1905	Southwest of Denver 39°12′27″N 105°16′20.1″W / 39.20750°N 105.272250°W / 39.20750; -105.272250 (Cheesman Reservoir)	Colorado	United States	dams
33	1973	Embudo Stream Gauging Station	1889	Embudo 36°12′18.4″N 105°57′49.2″W / 36.205111°N 105.963667°W / 36.205111; -105.963667 (Embudo Stream Gauging Station)	New Mexico	United States	water supply & control
34	1973	Ingalls Building	1903	Cincinnati 39°6′1″N 84°30′45.1″W / 39.10028°N 84.512528°W / 39.10028; -84.512528 (Ingalls Building)	Ohio	United States	buildings
35	1973	Pelton Impulse Water Wheel	1878	Camptonville 39°27′7″N 121°2′55″W / 39.45194°N 121.04861°W / 39.45194; -121.04861 (Pelton Impulse Water Wheel)	California	United States	power generation
36	1973	Starrucca Viaduct	1848	Lanesboro 41°57′51.3″N 75°35′0.6″W / 41.964250°N 75.583500°W / 41.964250; -75.583500 (Starrucca Viaduct)	Pennsylvania	United States	bridges
37	1974	Kansas City Park and Boulevard System	1893 to 1915	Kansas City 39°4′57″N 94°33′18″W / 39.08250°N 94.55500°W / 39.08250; -94.55500	Missouri	United States	surveys & maps
38	1974	Milwaukee Metropolitan Sewage Treatment Plant, home of Milorganite^[5]	1919	Milwaukee 43°1′21.3″N 87°53′57.3″W / 43.022583°N 87.899250°W / 43.022583; -87.899250	Wisconsin	United States	water supply & control
39	1974	Philadelphia Municipal Water Supply	1801	Philadelphia 39°57′56″N 75°10′51″W / 39.96556°N 75.18083°W / 39.96556; -75.18083	Pennsylvania	United States	water supply & control
40	1974	Stone Arch Bridge	1883	Minneapolis 44°58′50.8″N 93°15′12.3″W / 44.980778°N 93.253417°W / 44.980778; -93.253417 (Stone Arch Bridge)	Minnesota	United States	bridges
41	1975	Castillo de San Marcos	1695	St. Augustine 29°53′52″N 81°18′41″W / 29.89778°N 81.31139°W / 29.89778; -81.31139 (Castillo de San Marcos)	Florida	United States	buildings
42	1975	Croton Water Supply System	1842	New York City 41°0′42.5″N 73°52′36.4″W / 41.011806°N 73.876778°W / 41.011806; -73.876778 (Croton Water Supply System)	New York	United States	water supply & control
43	1975	Folsom Hydroelectric Power System	1895	Folsom 38°40′46.6″N 121°10′37.2″W / 38.679611°N 121.177000°W / 38.679611; -121.177000 (Folsom Hydroelectric Power System)	California	United States	power generation
44	1975	Granite Railway	1826	Quincy 42°14′44.6″N 71°2′9″W / 42.245722°N 71.03583°W / 42.245722; -71.03583 (Granite Railway)	Massachusetts	United States	roads & rails
45	1975	Hoosac Tunnel	1875	Berkshire County 42°40′31.1″N 73°2′45.1″W / 42.675306°N 73.045861°W / 42.675306; -73.045861 (Hoosac Tunnel)	Massachusetts	United States	tunnels
46	1975	Lawrence Experiment Station	1886	Lawrence 42°41′53.8″N 71°9′55.7″W / 42.698278°N 71.165472°W / 42.698278; -71.165472 (Lawrence Experiment Station)	Massachusetts	United States	research & educational
47	1975	Marlette Lake Water System	1873 to 1887	Virginia City 39°13′9.5″N 119°47′20.1″W / 39.219306°N 119.788917°W / 39.219306; -119.788917 (Marlette Lake Water System)	Nevada	United States	water supply & control
48	1975	Mount Washington Cog Railway	1869	Mount Washington 44°16′26″N 71°19′55″W / 44.27389°N 71.33194°W / 44.27389; -71.33194 (Mount Washington Cog Railway)	New Hampshire	United States	roads & rails
49	1975	Smithfield Street Bridge	1883	Pittsburgh 40°26′5.4″N 80°0′7.7″W / 40.434833°N 80.002139°W / 40.434833; -80.002139 (Smithfield Street Bridge)	Pennsylvania	United States	bridges
50	1975	Tunkhannock Viaduct	1915	Nicholson 41°37′34.2″N 75°46′34.4″W / 41.626167°N 75.776222°W / 41.626167; -75.776222 (Tunkhannock Viaduct)	Pennsylvania	United States	bridges
51	1976	Crozet's Blue Ridge Tunnel	1858	Waynesboro 38°2′3.1″N 78°51′28.4″W / 38.034194°N 78.857889°W / 38.034194; -78.857889 (Crozet's Blue Ridge Tunnel)	Virginia	United States	tunnels
52	1976	Cumbres and Toltec Scenic Railroad	1880	Chama to Antonito 36°59′42″N 106°17′51.1″W / 36.99500°N 106.297528°W / 36.99500; -106.297528	New Mexico and Colorado	United States	roads & rails
53	1976	Elephant Butte Dam	1916	Truth or Consequences 33°9′14.9″N 107°11′31.3″W / 33.154139°N 107.192028°W / 33.154139; -107.192028 (Elephant Butte Dam)	New Mexico	United States	dams
54	1976	First Concrete Pavement	1893	Bellefontaine 40°21′37.5″N 83°45′33.6″W / 40.360417°N 83.759333°W / 40.360417; -83.759333 (First Concrete Pavement)	Ohio	United States	roads & rails
55	1976	International Boundary Marker No. 1^[6]	1855	Doña Ana County 31°47′2″N 106°31′47.1″W / 31.78389°N 106.529750°W / 31.78389; -106.529750	New Mexico	United States	surveys & maps
56	1976	King's Road	1766 to 1775	New Smyrna 29°38′23.4″N 81°16′50.3″W / 29.639833°N 81.280639°W / 29.639833; -81.280639 (King's Road)	Florida	United States	roads & rails
57	1976	National Road	1811–1839	Cumberland to Vandalia 39°57′38.7″N 82°27′2″W / 39.960750°N 82.45056°W / 39.960750; -82.45056 (National Road)	Maryland to Illinois	United States	roads & rails
58	1977	Charlestown Naval Dry Dock	1833	Boston 42°22′23.7″N 71°3′19.3″W / 42.373250°N 71.055361°W / 42.373250; -71.055361 (Charlestown Naval Dry Dock)	Massachusetts	United States	water transportation
59	1977	City Plan of Savannah	1733	Savannah 32°4′32″N 81°5′31″W / 32.07556°N 81.09194°W / 32.07556; -81.09194 (City Plan of Savannah)	Georgia	United States	surveys & maps
60	1977	Great Falls Raceway and Power System	1800	Paterson 40°54′55.1″N 74°10′52.1″W / 40.915306°N 74.181139°W / 40.915306; -74.181139	New Jersey	United States	power generation
61	1977	First New York Subway	1904	New York City 40°42′45.3″N 74°0′24.2″W / 40.712583°N 74.006722°W / 40.712583; -74.006722 (First New York Subway)	New York	United States	roads & rails
62	1977	Mason–Dixon line	1767	39°43′16.1″N 80°7′5.3″W / 39.721139°N 80.118139°W / 39.721139; -80.118139 (Mason–Dixon line)	Maryland & Pennsylvania	United States	surveys & maps
63	1977	Minot's Ledge Lighthouse	1860	off Scituate 42°16′11″N 70°45′32.9″W / 42.26972°N 70.759139°W / 42.26972; -70.759139 (Minot's Ledge Lighthouse)	Massachusetts	United States	water transportation
64	1977	Mullan Road	1862	Walla Walla 46°46′8.3″N 118°12′22.6″W / 46.768972°N 118.206278°W / 46.768972; -118.206278 (Mullan Road)	Washington	United States	roads & rails
65	1977	Dry Dock No 1 Norfolk Naval Shipyard	1833	Portsmouth 36°49′14″N 76°17′35″W / 36.82056°N 76.29306°W / 36.82056; -76.29306 (Gosport Naval Dry Docks)	Virginia	United States	water transportation
66	1977	Reversal of the Chicago River	1900	Chicago 41°42′18″N 87°56′2″W / 41.70500°N 87.93389°W / 41.70500; -87.93389 (Reversal of the Chicago River)	Illinois	United States	water transportation
67	1977	Vulcan Street Plant	1882	Appleton 44°15′29.2″N 88°23′50.2″W / 44.258111°N 88.397278°W / 44.258111; -88.397278 (Vulcan Street Plant)	Wisconsin	United States	power generation
68	1977	William E. Ward House	1876	Rye Brook 41°1′32.5″N 73°40′3.1″W / 41.025694°N 73.667528°W / 41.025694; -73.667528 (William E. Ward House)	New York	United States	buildings
69	1978	Boston Subway	1897	Boston 42°21′23.8″N 71°3′43.6″W / 42.356611°N 71.062111°W / 42.356611; -71.062111 (Boston Subway)	Massachusetts	United States	roads & rails
70	1978	Dunlap's Creek Bridge	1839	Brownsville 40°1′17.2″N 79°53′17.2″W / 40.021444°N 79.888111°W / 40.021444; -79.888111 (Dunlap's Creek Bridge)	Pennsylvania	United States	bridges
71	1978	Hudson and Manhattan Railroad Tunnel	1908	Jersey City to New York City 40°43′56.7″N 74°1′11.6″W / 40.732417°N 74.019889°W / 40.732417; -74.019889	New Jersey & New York	United States	tunnels
72	1978	Newark International Airport	1928	Newark 40°41′22.2″N 74°10′28.2″W / 40.689500°N 74.174500°W / 40.689500; -74.174500 (Newark International Airport)	New Jersey	United States	aviation
73	1978	United States Military Academy	1813	West Point 41°23′34.8″N 73°57′28.8″W / 41.393000°N 73.958000°W / 41.393000; -73.958000 (United States Military Academy)	New York	United States	research & educational
74	1979	Cleveland Hopkins Airport	1925	Cleveland 41°24′45″N 81°50′53″W / 41.41250°N 81.84806°W / 41.41250; -81.84806 (Cleveland Hopkins Airport)	Ohio	United States	aviation
75	1979	Fink Deck Truss Bridge	1870	Lynchburg 37°26′24.3″N 79°9′56″W / 37.440083°N 79.16556°W / 37.440083; -79.16556 (Fink Deck Truss Bridge)	Virginia	United States	bridges
76	1979	Fink Through Truss Bridge	1858	Hamden 40°36′14.3″N 74°54′8.1″W / 40.603972°N 74.902250°W / 40.603972; -74.902250 (Fink Through Truss Bridge)	New Jersey	United States	bridges
77	1979	Iron Bridge	1779	Ironbridge 52°37′38.4″N 2°29′7.6″W / 52.627333°N 2.485444°W / 52.627333; -2.485444 (Iron Bridge)	West Midlands	England	bridges
78	1979	Moffat Tunnel	1928	Winter Park 39°53′37.5″N 105°42′41.3″W / 39.893750°N 105.711472°W / 39.893750; -105.711472 (Moffat Tunnel)	Colorado	United States	tunnels
79	1979	Rockville Bridge	1902	Harrisburg 40°19′59.9″N 76°54′38.8″W / 40.333306°N 76.910778°W / 40.333306; -76.910778 (Rockville Bridge)	Pennsylvania	United States	bridges
80	1980	Goodyear Airdock	1929	Akron 41°1′54.9″N 81°28′14.6″W / 41.031917°N 81.470722°W / 41.031917; -81.470722 (Goodyear Airdock)	Ohio	United States	aviation
81	1980	Hydraulic-Inclined Plane System of the Morris Canal	1831	Waterloo Village 40°54′55.2″N 74°21′23.8″W / 40.915333°N 74.356611°W / 40.915333; -74.356611	New Jersey	United States	water transportation
82	1981	Borden Base Line	1831	Hatfield 42°25′33.7″N 72°37′9″W / 42.426028°N 72.61917°W / 42.426028; -72.61917 (Borden Base Line)	Massachusetts	United States	surveys & maps
83	1981	Chain of Rocks Water Purification Plant	1904	St. Louis 38°45′18.5″N 90°11′11.6″W / 38.755139°N 90.186556°W / 38.755139; -90.186556	Missouri	United States	water supply & control
84	1981	Charles River Basin Project	1910	Boston 42°22′3.8″N 71°4′12.8″W / 42.367722°N 71.070222°W / 42.367722; -71.070222 (Charles River Basin Project)	Massachusetts	United States	water supply & control
85	1981	Cortland Street Drawbridge	1902	Chicago 41°55′1.1″N 87°39′51.4″W / 41.916972°N 87.664278°W / 41.916972; -87.664278 (Cortland Street Drawbridge)	Illinois	United States	bridges
86	1981	George Washington Bridge	1931	Fort Lee to New York City 40°51′6.1″N 73°57′9.7″W / 40.851694°N 73.952694°W / 40.851694; -73.952694 (George Washington Bridge)	New Jersey & New York	United States	bridges
87	1981	Louisville Water Works	1875 to 1896	Louisville 38°16′50″N 85°42′4.3″W / 38.28056°N 85.701194°W / 38.28056; -85.701194 (Louisville Water Works)	Kentucky	United States	water supply & control
88	1981	Montgomery Bell's Tunnel	1818	Cheatham County 36°8′48.5″N 87°7′19.3″W / 36.146806°N 87.122028°W / 36.146806; -87.122028 (Montgomery Bell's Tunnel)	Tennessee	United States	tunnels
89	1981	Snoqualmie Falls Cavity Generating Station	1899	Snoqualmie 47°32′39.5″N 121°50′29.3″W / 47.544306°N 121.841472°W / 47.544306; -121.841472	Washington	United States	power generation
90	1981	Union Station	1894	St. Louis 38°37′41.2″N 90°12′28.8″W / 38.628111°N 90.208000°W / 38.628111; -90.208000 (Union Station)	Missouri	United States	roads & rails
91	1981	Washington Monument	1885	Washington 38°53′22.1″N 77°2′6.9″W / 38.889472°N 77.035250°W / 38.889472; -77.035250 (Washington Monument)	District of Columbia	United States	buildings
92	1981	Whipple Truss Bridge	1855	Schenectady 42°49′5.2″N 73°55′27″W / 42.818111°N 73.92417°W / 42.818111; -73.92417 (Whipple Truss Bridge)	New York	United States	bridges
93	1982	Carrollton Viaduct	1829	Baltimore 39°16′31.5″N 76°39′18″W / 39.275417°N 76.65500°W / 39.275417; -76.65500 (Carrollton Viaduct)	Maryland	United States	bridges
94	1982	Detroit-Windsor Tunnel	1930	Detroit 42°19′28″N 83°2′25.4″W / 42.32444°N 83.040389°W / 42.32444; -83.040389 (Detroit-Windsor Tunnel)	Michigan	United States	tunnels
95	1982	Eads South Pass Navigation Works	1879	Port Eads 28°59′50″N 89°8′38″W / 28.99722°N 89.14389°W / 28.99722; -89.14389 (Eads South Pass Navigation Works)	Louisiana	United States	water transportation
96	1982	Holland Tunnel	1927	Jersey City to New York City 40°43′38.9″N 74°1′16″W / 40.727472°N 74.02111°W / 40.727472; -74.02111 (Holland Tunnel)	New Jersey & New York	United States	tunnels
97	1982	John A. Roebling Suspension Bridge	1866	Cincinnati 39°5′34.8″N 84°30′35.6″W / 39.093000°N 84.509889°W / 39.093000; -84.509889	Ohio	United States	bridges
98	1982	Kinzua Railway Viaduct	1882	McKean County 41°45′47.3″N 78°35′21.1″W / 41.763139°N 78.589194°W / 41.763139; -78.589194 (Kinzua Railway Viaduct)	Pennsylvania	United States	bridges
99	1982	Rogue River Bridge	1931	Gold Beach 42°25′40.5″N 124°24′47.5″W / 42.427917°N 124.413194°W / 42.427917; -124.413194 (Rogue River Bridge)	Oregon	United States	bridges
100	1982	Second Street Bridge	1886	Allegan 42°31′32.7″N 85°50′54.6″W / 42.525750°N 85.848500°W / 42.525750; -85.848500 (Second Street Bridge)	Michigan	United States	bridges
101	1982	Watertown Arsenal	1859	Watertown 42°21′44″N 71°9′58″W / 42.36222°N 71.16611°W / 42.36222; -71.16611 (Watertown Arsenal)	Massachusetts	United States	research & educational
102	1983	Atlantic City Convention Hall	1929	Atlantic City 39°21′18″N 74°26′19.1″W / 39.35500°N 74.438639°W / 39.35500; -74.438639 (Atlantic City Convention Hall)	New Jersey	United States	buildings
103	1983	Bailey Island Bridge	1928	Harpswell 43°44′57.1″N 69°59′19.3″W / 43.749194°N 69.988694°W / 43.749194; -69.988694 (Bailey Island Bridge)	Maine	United States	bridges
104	1983	Blenheim Bridge	1855	North Blenheim 42°28′18.4″N 74°26′29.4″W / 42.471778°N 74.441500°W / 42.471778; -74.441500 (Blenheim Bridge)	New York	United States	bridges
105	1983	Iron Building of the U.S. Army Arsenal	1859	Watervliet 42°43′5.9″N 73°42′14.5″W / 42.718306°N 73.704028°W / 42.718306; -73.704028	New York	United States	buildings
106	1983	Ohio Canal System	1848	Akron 40°52′39.2″N 81°35′1.4″W / 40.877556°N 81.583722°W / 40.877556; -81.583722 (Ohio Canal System)	Ohio	United States	water transportation
107	1983	Peavey–Haglin Experimental Concrete Grain Elevator	1900	St. Louis Park 44°56′32.7″N 93°20′42.8″W / 44.942417°N 93.345222°W / 44.942417; -93.345222	Minnesota	United States	buildings
108	1983	Sault Ste. Marie Hydroelectric Complex	1902	Sault Ste. Marie 46°29′50.8″N 84°19′55.7″W / 46.497444°N 84.332139°W / 46.497444; -84.332139	Michigan	United States	power generation
109	1983	Zuiderzee Enclosure Dam	1927 to 1932	Zaandam 52°59′37.5″N 5°9′19.1″E / 52.993750°N 5.155306°E / 52.993750; 5.155306 (Zuiderzee Enclosure Dam)	North Holland	Netherlands	water supply & control
110	1984	Columbia River Scenic Highway	1922	Portland 45°39′19.3″N 121°54′13.2″W / 45.655361°N 121.903667°W / 45.655361; -121.903667 (Columbia River Scenic Highway)	Oregon	United States	roads & rails
111	1984	Columbia-Wrightsville Bridge	1930	Columbia 40°1′42.4″N 76°31′5.6″W / 40.028444°N 76.518222°W / 40.028444; -76.518222 (Columbia-Wrightsville Bridge)	Pennsylvania	United States	bridges
112	1984	Golden Gate Bridge	1937	San Francisco 37°49′11.7″N 122°28′42.7″W / 37.819917°N 122.478528°W / 37.819917; -122.478528 (Golden Gate Bridge)	California	United States	bridges
113	1984	Hoover Dam	1935	Boulder City 36°0′57.7″N 114°44′14.8″W / 36.016028°N 114.737444°W / 36.016028; -114.737444 (Hoover Dam)	Nevada & Arizona	United States	dams
114	1984	Lowell Waterpower System	1821	Lowell 42°38′48.5″N 71°18′41.6″W / 42.646806°N 71.311556°W / 42.646806; -71.311556 (Lowell Waterpower System)	Massachusetts	United States	power generation
115	1984	Panama Canal	1914	Colón to Panama City9°7′2.2″N 79°43′7.6″W / 9.117278°N 79.718778°W / 9.117278; -79.718778 (Panama Canal)		Panama	water transportation
116	1984	Rocky River Pumped Storage Hydro-Plant	1925	New Milford 41°34′49.7″N 73°26′13.2″W / 41.580472°N 73.437000°W / 41.580472; -73.437000	Connecticut	United States	power generation
117	1985	Bayonne Bridge	1931	Bayonne to Staten Island 40°38′29.8″N 74°8′31.6″W / 40.641611°N 74.142111°W / 40.641611; -74.142111 (Bayonne Bridge)	New Jersey & New York	United States	bridges
118	1985	Beginning Point of the U.S. Public Land Survey	1785	Liverpool 40°38′19.7″N 80°31′8.4″W / 40.638806°N 80.519000°W / 40.638806; -80.519000	Ohio	United States	surveys & maps
119	1985	Cape Cod Canal	1914	Barnstable County 41°45′51.1″N 70°34′6.3″W / 41.764194°N 70.568417°W / 41.764194; -70.568417 (Cape Cod Canal)	Massachusetts	United States	water transportation
120	1985	Chesapeake and Delaware Canal	1828 (rebuilt 1927)	New Castle 39°32′34″N 75°43′14″W / 39.54278°N 75.72056°W / 39.54278; -75.72056 (Chesapeake and Delaware Canal)	Delaware	United States	water transportation
121	1985	Davis Island Lock and Dam	1885	Pittsburgh 40°29′35″N 80°3′56″W / 40.49306°N 80.06556°W / 40.49306; -80.06556 (Davis Island Lock and Dam)	Pennsylvania	United States	water transportation
122	1985	Forth Railway Bridge	1890	North Queensferry to South Queensferry 56°0′1.5″N 3°23′19.4″W / 56.000417°N 3.388722°W / 56.000417; -3.388722 (Forth Railway Bridge)		Scotland	bridges
123	1985	Going-to-the-Sun Road	1932	Glacier National Park 48°41′42″N 113°49′1.2″W / 48.69500°N 113.817000°W / 48.69500; -113.817000 (Going-to-the-Sun Road)	Montana	United States	roads & rails
124	1985	High Bridge	1877	Jessamine & Mercer Counties 37°49′1.7″N 84°43′12.4″W / 37.817139°N 84.720111°W / 37.817139; -84.720111 (High Bridge)	Kentucky	United States	bridges
125	1985	Statue of Liberty	1886	New York Harbor 40°41′21.5″N 74°2′40.4″W / 40.689306°N 74.044556°W / 40.689306; -74.044556 (Statue of Liberty)	New York^[7]	United States	buildings
126	1986	White River Concrete Arch Bridge	1930	Cotter 36°16′2″N 92°32′39″W / 36.26722°N 92.54417°W / 36.26722; -92.54417 (White River Concrete Arch Bridge)	Arkansas	United States	bridges
127	1986	Cranetown Triangulation Site	1817	Cedar Grove 40°49′43.9″N 74°13′27.1″W / 40.828861°N 74.224194°W / 40.828861; -74.224194 (Cranetown Triangulation Site)	New Jersey	United States	surveys & maps
128	1986	Eiffel Tower	1889	Paris 48°51′30.2″N 2°17′40.2″E / 48.858389°N 2.294500°E / 48.858389; 2.294500 (Eiffel Tower)	Île-de-France	France	buildings
129	1986	El Camino Real	1598-1800s	Santa Fe and Mexico City 34°3′38.7″N 106°53′36.6″W / 34.060750°N 106.893500°W / 34.060750; -106.893500 (El Camino Real)	New Mexico	United States and Mexico	roads & rails
130	1986	El Camino Real (The Royal Road) Eastern Branch	from 16th century	San Antonio 29°26′45.8″N 98°30′12.3″W / 29.446056°N 98.503417°W / 29.446056; -98.503417	Texas	United States	roads & rails
131	1986	New Castle Ice Harbor	1974	New Castle 39°39′28″N 75°33′39″W / 39.65778°N 75.56083°W / 39.65778; -75.56083 (New Castle Ice Harbor)	Delaware	United States	water transportation
132	1986	Norris Dam	1936	Knoxville 36°13′28″N 84°5′31.5″W / 36.22444°N 84.092083°W / 36.22444; -84.092083 (Norris Dam)	Tennessee	United States	dams
133	1986	San Francisco–Oakland Bay Bridge	1937	San Francisco to Oakland 37°47′53.6″N 122°22′40.7″W / 37.798222°N 122.377972°W / 37.798222; -122.377972	California	United States	bridges
134	1986	Sewall's Bridge	1761 (rebuilt 1934)	York 43°8′10.2″N 70°39′38.3″W / 43.136167°N 70.660639°W / 43.136167; -70.660639 (Sewall's Bridge)	Maine	United States	bridges
135	1986	Triborough Bridge Project	1936	New York City 40°47′26.6″N 73°55′33.2″W / 40.790722°N 73.925889°W / 40.790722; -73.925889 (Triborough Bridge Project)	New York	United States	bridges
136	1986	U.S. Army Corps of Engineers Waterways Exp. Station	1929	Vicksburg 32°18′4.2″N 90°52′18″W / 32.301167°N 90.87167°W / 32.301167; -90.87167	Mississippi	United States	research & educational
137	1986	U.S. Capitol	1793, rebuilt 1863	Washington 38°53′23″N 77°0′33″W / 38.88972°N 77.00917°W / 38.88972; -77.00917 (U.S. Capitol)	District of Columbia	United States	buildings
138	1987	Allegheny Portage Railroad	1834	Hollidaysburg 40°27′23″N 78°33′3.4″W / 40.45639°N 78.550944°W / 40.45639; -78.550944 (Allegheny Portage Railroad)	Pennsylvania	United States	roads & rails
139	1987	Bonneville Dam, Columbia River System	1937	Bonneville 45°38′39.7″N 121°56′26.7″W / 45.644361°N 121.940750°W / 45.644361; -121.940750	Oregon	United States	power generation
140	1987	Bridges of Keeseville	1843, 1878, 1888	Keeseville 44°30′13.2″N 73°28′57.3″W / 44.503667°N 73.482583°W / 44.503667; -73.482583 (Bridges of Keeseville)	New York	United States	bridges
141	1987	Dismal Swamp Canal	1805	Chesapeake to South Mills 36°35′34.1″N 76°23′5.4″W / 36.592806°N 76.384833°W / 36.592806; -76.384833 (Dismal Swamp Canal)	Virginia to North Carolina	United States	water transportation
142	1987	Houston Ship Channel	1837–present	Houston 29°44′35.8″N 95°6′16.5″W / 29.743278°N 95.104583°W / 29.743278; -95.104583 (Houston Ship Channel)	Texas	United States	water transportation
143	1987	Kamehameha V Post Office	1871	Honolulu 21°18′34.6″N 157°51′47.4″W / 21.309611°N 157.863167°W / 21.309611; -157.863167 (Kamehameha V Post Office)	Hawaii	United States	buildings
144	1987	Frisco Bridge	1892	Memphis 35°7′43.6″N 90°4′34.7″W / 35.128778°N 90.076306°W / 35.128778; -90.076306 (Frisco Bridge)	Tennessee & Arkansas	United States	bridges
145	1987	Quebec Bridge	1917	Quebec City 46°44′45.6″N 71°17′17.3″W / 46.746000°N 71.288139°W / 46.746000; -71.288139 (Quebec Bridge)	Quebec	Canada	bridges
146	1988	Belle Fourche Dam	1911	Belle Fourche 44°43′51.3″N 103°40′36.8″W / 44.730917°N 103.676889°W / 44.730917; -103.676889 (Belle Fourche Dam)	South Dakota	United States	dams
147	1988	École Nationale des Ponts et Chaussées	1747	Paris 48°51′20.9″N 2°19′49.9″E / 48.855806°N 2.330528°E / 48.855806; 2.330528	Île-de-France	France	research & educational
148	1988	Keokuk Hydro-Power System	1913	Keokuk 40°23′56.6″N 91°21′49″W / 40.399056°N 91.36361°W / 40.399056; -91.36361 (Keokuk Hydro-Power System)	Iowa	United States	power generation
149	1988	Pennsylvania Turnpike	1940	40°1′49.9″N 78°29′33.6″W / 40.030528°N 78.492667°W / 40.030528; -78.492667 (Pennsylvania Turnpike)	Pennsylvania	United States	roads & rails
150	1988	River des Peres Sewerage & Drainage Works	1924 to 1931	St. Louis 38°39′42.3″N 90°18′33.9″W / 38.661750°N 90.309417°W / 38.661750; -90.309417	Missouri	United States	water supply & control
151	1988	Sydney Harbour Bridge	1932	Sydney 33°51′8.1″S 151°12′38.6″E / 33.852250°S 151.210722°E / -33.852250; 151.210722 (Sydney Harbour Bridge)	New South Wales	Australia	bridges
152	1989	Royal Colonial Boundary of 1665	1728–1819	Middlesboro 36°36′2.9″N 83°40′31.5″W / 36.600806°N 83.675417°W / 36.600806; -83.675417 (Royal Colonial Boundary of 1665)	Kentucky	United States	surveys & maps
153	1989	Zhaozhou Bridge	605 AD	Zhaoxian 37°43′12.9″N 114°45′47.7″E / 37.720250°N 114.763250°E / 37.720250; 114.763250 (Zhaozhou Bridge)	Hebei	China	bridges
154	1990	Fort Peck Dam	1940	Fort Peck 48°0′10.1″N 106°24′58″W / 48.002806°N 106.41611°W / 48.002806; -106.41611 (Fort Peck Dam)	Montana	United States	dams
155	1990	Maria Pia Bridge	1877	Oporto 41°8′23.4″N 8°35′49.6″W / 41.139833°N 8.597111°W / 41.139833; -8.597111 (Maria Pia Bridge)	Norte	Portugal	bridges
156	1990	Salginatobel Bridge	1930	Grisons 46°58′54.4″N 9°43′5.1″E / 46.981778°N 9.718083°E / 46.981778; 9.718083 (Salginatobel Bridge)	Graubünden	Switzerland	bridges
157	1991	Eddystone Lighthouse	1882	off Plymouth 50°11′2″N 4°16′5.1″W / 50.18389°N 4.268083°W / 50.18389; -4.268083 (Eddystone Lighthouse)		England	water transportation
158	1991	Fritz Engineering Laboratory	1910	Bethlehem 40°36′28.9″N 75°22′34.3″W / 40.608028°N 75.376194°W / 40.608028; -75.376194 (Fritz Engineering Laboratory)	Pennsylvania	United States	research & educational
159	1991	St. Clair Tunnel	1891	Port Huron 42°57′32.4″N 82°25′22.2″W / 42.959000°N 82.422833°W / 42.959000; -82.422833 (St. Clair Tunnel)	Michigan	United States	tunnels
160	1991	Thames Tunnel	1843	London 51°30′12.7″N 0°3′13.3″W / 51.503528°N 0.053694°W / 51.503528; -0.053694 (Thames Tunnel)		England	tunnels
161	1992	Acquedotto Traiano-Paolo	110 AD	Rome 42°3′12.9″N 12°20′18.7″E / 42.053583°N 12.338528°E / 42.053583; 12.338528 (Acquedotto Traiano-Paolo)	Lazio	Italy	water supply & control
162	1992	Niagara Falls Suspension Bridge	1849, 1855, 1883, 1898, 1941	Niagara Gorge 43°5′24.8″N 79°4′3.4″W / 43.090222°N 79.067611°W / 43.090222; -79.067611 (Niagara Falls Suspension Bridge)	Ontario and New York	Canada and United States	bridges
163	1992	Duck Creek Aqueduct	1846	Metamora 39°26′46.1″N 85°7′48″W / 39.446139°N 85.13000°W / 39.446139; -85.13000 (Duck Creek Aqueduct)	Indiana	United States	water supply & control
164	1992	Hohokam Canal System	600 - 1450 AD	Maricopa County 33°26′43.8″N 111°48′56.2″W / 33.445500°N 111.815611°W / 33.445500; -111.815611 (Hohokam Canal System)	Arizona	United States	water supply & control
165	1992	San Jacinto Monument	1939	Houston 29°44′59.5″N 95°4′50.6″W / 29.749861°N 95.080722°W / 29.749861; -95.080722 (San Jacinto Monument)	Texas	United States	buildings
166	1993	Blimp Hangars	1942	Tustin 33°42′10.8″N 117°49′26.3″W / 33.703000°N 117.823972°W / 33.703000; -117.823972 (Blimp Hangars)	California	United States	aviation
167	1993	Denison Dam	1943	Denison 33°49′52.6″N 96°34′16″W / 33.831278°N 96.57111°W / 33.831278; -96.57111 (Denison Dam)	Texas & Oklahoma	United States	dams
168	1993	Hanford B Reactor	1944	Richland 46°37′49.1″N 119°38′50.3″W / 46.630306°N 119.647306°W / 46.630306; -119.647306 (Hanford B Reactor)	Washington	United States	power generation
169	1993	Stevens Pass Railroad Tunnels & Switchback System	1900	Stevens Pass 47°44′52.4″N 121°7′26.3″W / 47.747889°N 121.123972°W / 47.747889; -121.123972	Washington	United States	tunnels
170	1994	Colorado River Aqueduct	1933–1941	Blythe 34°17′23.6″N 114°10′19.5″W / 34.289889°N 114.172083°W / 34.289889; -114.172083 (Colorado River Aqueduct)	California	United States	water supply & control
171	1994	Kavanagh Building	1936	Buenos Aires 34°35′43.7″S 58°22′28.9″W / 34.595472°S 58.374694°W / -34.595472; -58.374694 (Kavanagh Building)		Argentina	buildings
172	1994	Missouri River Bridges	1926	Chamberlain 43°48′42.1″N 99°20′16.1″W / 43.811694°N 99.337806°W / 43.811694; -99.337806 (Missouri River Bridges)	South Dakota	United States	bridges
173	1995	Red Hill Underground Fuel Storage Facility	1943	Honolulu 21°22′18″N 157°53′44″W / 21.37167°N 157.89556°W / 21.37167; -157.89556	Hawaii	United States	tunnels
174	1994	Viaducto del Malleco	1890	Malleco River 37°57′47″S 72°26′20″W / 37.96306°S 72.43889°W / -37.96306; -72.43889 (Viaducto del Malleco)	Central Chile	Chile	bridges
175	1994	White Pass and Yukon Route	1900	Whitehorse, Yukon to Skagway, Alaska 59°37′28″N 135°8′18.3″W / 59.62444°N 135.138417°W / 59.62444; -135.138417 (White Pass and Yukon Route)	Yukon Territory to Alaska	Canada & United States	roads & rails
176	1995	Alaska Highway	1942	Dawson Creek to Delta Junction 59°54′39.6″N 131°33′20.6″W / 59.911000°N 131.555722°W / 59.911000; -131.555722 (Alaska Highway)	British Columbia to Alaska	Canada & United States	roads & rails
177	1995	Banaue Rice Terraces	100 BC	Banaue 16°55′57.4″N 121°3′30.1″E / 16.932611°N 121.058361°E / 16.932611; 121.058361 (Banaue Rice Terraces)	Ifugao	Philippines	water supply & control
178	1995	Acueducto de Queretaro	1738	Querétaro 20°35′48″N 100°22′20.6″W / 20.59667°N 100.372389°W / 20.59667; -100.372389 (Acueducto de Queretaro)		Mexico	water supply & control
179	1995	Victoria Falls Bridge	1905	Zambezi River 17°55′41.7″S 25°51′26.1″E / 17.928250°S 25.857250°E / -17.928250; 25.857250 (Victoria Falls Bridge)		Zimbabwe & Zambia	bridges
180	1996	Armour-Swift-Burlington Bridge	1912	Kansas City 39°7′0″N 94°34′47.5″W / 39.11667°N 94.579861°W / 39.11667; -94.579861 (Armour-Swift-Burlington Bridge)	Missouri	United States	bridges
181	1996	Dublin-Belfast railway line	1839	Dublin to Belfast 53°43′0″N 6°20′15″W / 53.71667°N 6.33750°W / 53.71667; -6.33750 (Dublin-Belfast railway line)		Ireland & Northern Ireland	roads & rails
182	1996	Kentucky Dam	1944	Gilbertsville 37°0′46.4″N 88°16′10.1″W / 37.012889°N 88.269472°W / 37.012889; -88.269472 (Kentucky Dam)	Kentucky	United States	dams
183	1996	Lake Moeris Quarry Road	2575-2137 BC	Lake Moeris 29°37′24.2″N 30°38′40.4″E / 29.623389°N 30.644556°E / 29.623389; 30.644556 (Lake Moeris Quarry Road)		Egypt	roads & rails
184	1996	City Plan of Philadelphia	1682	Philadelphia 39°57′28.6″N 75°10′14.2″W / 39.957944°N 75.170611°W / 39.957944; -75.170611 (City Plan of Philadelphia)	Pennsylvania	United States	surveys & maps
185	1996	San Antonio River Walk & Flood Control System	1929 to 1941	San Antonio 29°25′30.7″N 98°29′29.7″W / 29.425194°N 98.491583°W / 29.425194; -98.491583	Texas	United States	water control & supply
186	1997	Grand Coulee Dam	1941	Grand Coulee 47°57′23.8″N 118°58′51.6″W / 47.956611°N 118.981000°W / 47.956611; -118.981000 (Grand Coulee Dam)	Washington	United States	dams
187	1997	Lake Washington Ship Canal & Hiram M. Chittenden Locks	1917	Seattle 47°39′55.7″N 122°23′49.6″W / 47.665472°N 122.397111°W / 47.665472; -122.397111	Washington	United States	water transportation
188	1997	Navajo Bridge	1929	Page 36°49′3.4″N 111°37′52.3″W / 36.817611°N 111.631194°W / 36.817611; -111.631194 (Navajo Bridge)	Arizona	United States	bridges
189	1997	North Island Main Trunk Railway	1885–1908	Auckland to Wellington 39°13′39.8″S 175°23′55.5″E / 39.227722°S 175.398750°E / -39.227722; 175.398750 (North Island Main Trunk Railway)	North Island	New Zealand	roads & rails
190	1997	Northampton Street Bridge	1896	Easton to Phillipsburg 40°41′29.3″N 75°12′14.4″W / 40.691472°N 75.204000°W / 40.691472; -75.204000 (Northampton Street Bridge)	Pennsylvania & New Jersey	United States	bridges
191	1997	Snowy Mountains Scheme	1974	Snowy Mountains 35°36′40.1″S 148°17′29.8″E / 35.611139°S 148.291611°E / -35.611139; 148.291611 (Snowy Mountains Scheme)	New South Wales	Australia	power generation
192	1997	Texas Commerce Bank Building (formerly Gulf, now Chase)	1929	Houston 29°45′32″N 95°21′49.7″W / 29.75889°N 95.363806°W / 29.75889; -95.363806	Texas	United States	buildings
193	1997	Walnut Street Bridge	1890	Harrisburg 40°15′27.1″N 76°53′9.8″W / 40.257528°N 76.886056°W / 40.257528; -76.886056 (Walnut Street Bridge)	Pennsylvania	United States	bridges
194	1998	Brooks AFB, Old Hangar 9	1918	San Antonio 29°20′38.5″N 98°26′38.9″W / 29.344028°N 98.444139°W / 29.344028; -98.444139 (Brooks AFB, Old Hangar 9)	Texas	United States	aviation
195	1998	Canton Viaduct	1835	Canton 42°9′28.8″N 71°9′14.5″W / 42.158000°N 71.154028°W / 42.158000; -71.154028 (Canton Viaduct)	Massachusetts	United States	bridges
196	1998	Göta Canal	1810 to 1832	Gothenburg 58°29′53.9″N 16°10′28.9″E / 58.498306°N 16.174694°E / 58.498306; 16.174694 (Göta Canal)	Västra Götaland	Sweden	water transportation
197	1998	Moseley Wrought Iron Arch Bridge	1864	North Andover 42°40′8.6″N 71°7′21.3″W / 42.669056°N 71.122583°W / 42.669056; -71.122583 (Moseley Wrought Iron Arch Bridge)	Massachusetts	United States	bridges
198	1998	Tehachapi Pass Railroad Line	1876	Kern County 35°12′3″N 118°32′13″W / 35.20083°N 118.53694°W / 35.20083; -118.53694 (Tehachapi Pass Railroad Line)	California	United States	roads & rails
199	1999	Acueducto de Segovia	50 AD	Segovia 40°56′52.7″N 4°7′4.3″W / 40.947972°N 4.117861°W / 40.947972; -4.117861 (Acueducto de Segovia)	Castile and León	Spain	water supply & control
200	1999	Arroyo Seco Parkway	1940	Los Angeles 34°4′23″N 118°14′2″W / 34.07306°N 118.23389°W / 34.07306; -118.23389 (Arroyo Seco Parkway)	California	United States	roads & rails
201	1999	Blue Ridge Parkway	begun 1935	Shenandoah NP to Great Smokey Mountains NP 36°26′28.5″N 81°5′42.9″W / 36.441250°N 81.095250°W / 36.441250; -81.095250 (Blue Ridge Parkway)	Virginia to North Carolina	United States	roads & rails
202	1999	Cape Hatteras Lighthouse	1870	Cape Hatteras 35°15′2″N 75°31′43.7″W / 35.25056°N 75.528806°W / 35.25056; -75.528806 (Cape Hatteras Lighthouse)	North Carolina	United States	water transportation
203	1999	Maine Turnpike	1947	43°21′17.2″N 70°35′26.2″W / 43.354778°N 70.590611°W / 43.354778; -70.590611 (Maine Turnpike)	Maine	United States	roads & rails
204	1999	McNeill Street Pumping Station	1887	Shreveport 32°31′3.8″N 93°45′25.9″W / 32.517722°N 93.757194°W / 32.517722; -93.757194 (McNeill Street Pumping Station)	Louisiana	United States	water supply & control
205	2000	Cedar Falls Hydroelectric Project	1901	Seattle 47°25′9.2″N 121°46′54.4″W / 47.419222°N 121.781778°W / 47.419222; -121.781778 (Cedar Falls Hydroelectric Project)	Washington	United States	power generation
206	2000	Forth and Clyde Canal and Union Canal	1790	55°56′18″N 4°9′18.8″W / 55.93833°N 4.155222°W / 55.93833; -4.155222		Scotland	water transportation
207	2000	Hagia Sophia	537 AD	Istanbul 41°0′31.2″N 28°58′48.6″E / 41.008667°N 28.980167°E / 41.008667; 28.980167 (Hagia Sophia)	Istanbul	Turkey	buildings
208	2000	Muskingum River Navigation System	1837	Zanesville 39°43′59.5″N 81°54′29.4″W / 39.733194°N 81.908167°W / 39.733194; -81.908167 (Muskingum River Navigation System)	Ohio	United States	water transportation
209	2000	Seventh Street Improvement Arches	1909	St. Paul 44°57′23″N 93°4′38″W / 44.95639°N 93.07722°W / 44.95639; -93.07722 (Seventh Street Improvement Arches)	Minnesota	United States	bridges
210	2000	West Baden Springs Hotel	1902	West Baden Springs 38°34′1.3″N 86°37′6.6″W / 38.567028°N 86.618500°W / 38.567028; -86.618500 (West Baden Springs Hotel)	Indiana	United States	buildings
211	2001	Bunker Hill Covered Bridge	1895, rebuilt 1994	Claremont 35°43′17.5″N 81°6′54.8″W / 35.721528°N 81.115222°W / 35.721528; -81.115222 (Bunker Hill Covered Bridge)	North Carolina	United States	bridges
212	2001	Galveston Seawall and Grade Raising	1904 (expanded through 1963)	Galveston 29°18′9″N 94°46′27″W / 29.30250°N 94.77417°W / 29.30250; -94.77417	Texas	United States	water supply & control
213	2001	Baltimore & Ohio Roundhouse & Shop Complex	1842 to 1850s	Martinsburg 39°27′33″N 77°57′36″W / 39.45917°N 77.96000°W / 39.45917; -77.96000	West Virginia	United States	buildings
214	2002	Conwy Suspension Bridge	1826	Conwy 53°16′49.7″N 3°49′25.6″W / 53.280472°N 3.823778°W / 53.280472; -3.823778 (Conwy Suspension Bridge)	Conwy	Wales	bridges
215	2002	Conwy Tubular Bridge	1849	Conwy 53°16′49″N 3°49′25″W / 53.28028°N 3.82361°W / 53.28028; -3.82361 (Conwy Tubular Bridge)	Conwy	Wales	bridges
216	2002	Dorton Arena	1952	Raleigh 35°47′38.4″N 78°42′37.3″W / 35.794000°N 78.710361°W / 35.794000; -78.710361 (Dorton Arena)	North Carolina	United States	buildings
217	2002	East Maui Irrigation System	1876 to 1923	East Maui 20°52′0″N 156°13′0″W / 20.86667°N 156.21667°W / 20.86667; -156.21667 (East Maui Irrigation System)	Hawaii	United States	water supply & control
218	2002	Five Stone Arch Bridges	1830 to 1866	Hillsborough 43°7′49″N 71°56′41.1″W / 43.13028°N 71.944750°W / 43.13028; -71.944750 (Five Stone Arch Bridges)	New Hampshire	United States	bridges
219	2002	Louisville and Portland Canal Locks & Dam	1830, rebuilt 1962	Louisville 38°16′18.5″N 85°46′45.6″W / 38.271806°N 85.779333°W / 38.271806; -85.779333	Kentucky	United States	water transportation
220	2002	Marshall Building	1906	Milwaukee 43°2′0.9″N 87°54′31.2″W / 43.033583°N 87.908667°W / 43.033583; -87.908667 (Marshall Building)	Wisconsin	United States	buildings
221	2002	Menai Suspension Bridge	1826	Anglesey 53°13′13.1″N 4°9′48.1″W / 53.220306°N 4.163361°W / 53.220306; -4.163361 (Menai Suspension Bridge)		Wales	bridges
222	2002	Old Cape Henry Light,	1792, replaced 1881	Virginia Beach 36°55′32.8″N 76°0′29.3″W / 36.925778°N 76.008139°W / 36.925778; -76.008139 (Old Cape Henry Light)	Virginia	United States	water transportation
223	2002	Portland Head Light	1787	Cape Elizabeth 43°37′23.2″N 70°12′28.4″W / 43.623111°N 70.207889°W / 43.623111; -70.207889 (Portland Head Light)	Maine	United States	water transportation
224	2002	Shannon Hydroelectric Scheme	1929	52°42′20″N 8°36′46″W / 52.70556°N 8.61278°W / 52.70556; -8.61278 (Shannon Hydroelectric Scheme)		Ireland	power generation
225	2002	Waldo-Hancock Suspension Bridge	1931	Bucksport 44°33′37.6″N 68°48′5.9″W / 44.560444°N 68.801639°W / 44.560444; -68.801639 (Waldo-Hancock Suspension Bridge)	Maine	United States	bridges
226	2003	Horseshoe Curve	1854	Altoona 40°29′54″N 78°29′9.1″W / 40.49833°N 78.485861°W / 40.49833; -78.485861 (Horseshoe Curve)	Pennsylvania	United States	roads & rails
227	2003	Suez Canal	1869	Port Said to Suez 30°42′18″N 32°20′39″E / 30.70500°N 32.34417°E / 30.70500; 32.34417 (Suez Canal)		Egypt	water transportation
228	2003	Tennessee State Capitol	1845 to 1877	Nashville 36°9′57.1″N 86°47′3.4″W / 36.165861°N 86.784278°W / 36.165861; -86.784278 (Tennessee State Capitol)	Tennessee	United States	buildings
229	2004	Hwaseong Fortress	1796	Suwon 37°17′0″N 127°0′57.6″E / 37.28333°N 127.016000°E / 37.28333; 127.016000 (Hwaseong Fortress)	Gyeonggi-do	Republic of Korea	buildings
230	2004	Mesa Verde Reservoirs	750 to 1180 AD	Montezuma County 37°14′26.3″N 108°30′16.7″W / 37.240639°N 108.504639°W / 37.240639; -108.504639 (Mesa Verde Reservoirs)	Colorado	United States	water supply & control
231	2004	Northern Pacific High Line Bridge No 64	1908	Valley City 46°56′18.9″N 97°59′26.9″W / 46.938583°N 97.990806°W / 46.938583; -97.990806	North Dakota	United States	bridges
232	2004	Old Wisla Bridge		Tczew 54°5′33.7″N 18°48′22.2″E / 54.092694°N 18.806167°E / 54.092694; 18.806167 (Old Wisla Bridge)	Vistula River	Poland	bridges
233	2005	Great Western Railway	1838	51°37′16.2″N 1°21′26.8″W / 51.621167°N 1.357444°W / 51.621167; -1.357444 (Great Western Railway)		England & Wales	roads & rails
234	2005	Philadelphia City Hall	1901	Philadelphia 39°57′10.1″N 75°9′48.8″W / 39.952806°N 75.163556°W / 39.952806; -75.163556 (Philadelphia City Hall)	Pennsylvania	United States	buildings
235	2005	Sweetwater Dam	1888	Spring Valley 32°41′29.8″N 117°0′29.2″W / 32.691611°N 117.008111°W / 32.691611; -117.008111 (Sweetwater Dam)	California	United States	dams
236	2005	Stanley Hydraulics Laboratory at the University of Iowa	established 1919	Iowa City 41°39′25.8″N 91°32′29″W / 41.657167°N 91.54139°W / 41.657167; -91.54139	Iowa	United States	research & educational
237	2006	Machu Picchu	1460 AD	13°9′48″S 72°32′44″W / 13.16333°S 72.54556°W / -13.16333; -72.54556 (Machu Picchu)		Peru	urban development
238	2006	Portland Observatory	1807	Portland 43°39′55.4″N 70°14′53.7″W / 43.665389°N 70.248250°W / 43.665389; -70.248250 (Portland Observatory)	Maine	United States	water transportation
239	2006	Tipon	1200 - 1534 AD	13°34′15″S 71°46′59″W / 13.57083°S 71.78306°W / -13.57083; -71.78306 (Tipon)		Peru	water supply & control
240	2007	Caledonian Canal	1822	Great Glen 57°6′44.9″N 4°44′18.8″W / 57.112472°N 4.738556°W / 57.112472; -4.738556 (Caledonian Canal)		Scotland	water transportation
241	2007	Craigellachie Bridge Moray	1814	Strathspey 57°29′28.8″N 3°11′38″W / 57.491333°N 3.19389°W / 57.491333; -3.19389 (Craigellachie Bridge Moray)		Scotland	bridges
242	2008	Choate Bridge	1764	Ipswich 42°40′46.1″N 70°50′13.6″W / 42.679472°N 70.837111°W / 42.679472; -70.837111 (Choate Bridge)	Massachusetts	United States	bridges
243	2008	Goldfields Water Supply	1903	Kalgoorlie 31°57′36″S 116°10′16.7″E / 31.96000°S 116.171306°E / -31.96000; 116.171306 (Goldfields Water Supply)	Western Australia	Australia	water supply & control
244	2008	Lacey V. Murrow Bridge and Mount Baker Ridge Tunnels	1940	King County 47°35′23.2″N 122°16′44.3″W / 47.589778°N 122.278972°W / 47.589778; -122.278972	Washington	United States	bridges
245	2008	Woodhead Dam	1897	Cape Town 33°58′38.2″S 18°24′7.9″E / 33.977278°S 18.402194°E / -33.977278; 18.402194 (Woodhead Dam)	Western Cape	South Africa	dams
246	2009	Guayabo Ceremonial Center	300 BC - AD 1400	Turrialba 9°58′21.7″N 83°41′26.6″W / 9.972694°N 83.690722°W / 9.972694; -83.690722 (Guayabo Ceremonial Center)	Turrialba	Costa Rica	civil engineering profession
247	2009	Vancouver's Mapping of the West Coast of North America	1791–1795	45°0′0″N 124°0′43″W / 45.00000°N 124.01194°W / 45.00000; -124.01194		Canada, Mexico and United States	surveys & maps
248	2009	Poughkeepsie-Highland Bridge	1886–1888	Poughkeepsie 41°42′38.5″N 73°56′41.1″W / 41.710694°N 73.944750°W / 41.710694; -73.944750 (Poughkeepsie-Highland Bridge)	New York	United States	bridges
249	2009	Manhattan Bridge	1909	New York City 40°42′27″N 73°59′26.9″W / 40.70750°N 73.990806°W / 40.70750; -73.990806 (Manhattan Bridge)	New York	United States	bridges
250	2009	Queensboro Bridge	1909	New York City 40°45′24.2″N 73°57′15.1″W / 40.756722°N 73.954194°W / 40.756722; -73.954194 (Queensboro Bridge)	New York	United States	bridges
251	2009	Williamsburg Bridge	1903	New York City 40°42′49.2″N 73°58′20.5″W / 40.713667°N 73.972361°W / 40.713667; -73.972361 (Williamsburg Bridge)	New York	United States	bridges
252	2010	Mackinac Bridge	1958	Straits of Mackinac 45°48′48.8″N 84°43′42″W / 45.813556°N 84.72833°W / 45.813556; -84.72833 (Mackinac Bridge)	Michigan	United States	bridges
253	2010	Rensselaer Polytechnic Institute	1824	Troy 42°43′48″N 73°40′39″W / 42.73000°N 73.67750°W / 42.73000; -73.67750 (Rensselaer Polytechnic Institute)	New York	United States	research & educational
254	2010	Thomas Viaduct Railroad Bridge^[8]	1835	Elkridge and Relay 39°13′17.5″N 76°42′48.1″W / 39.221528°N 76.713361°W / 39.221528; -76.713361 (Thomas Viaduct Railroad Bridge)	Maryland	United States	bridges
255	2011	Utica Memorial Auditorium	1959	Utica 43°6′17.9″N 75°14′0.5″W / 43.104972°N 75.233472°W / 43.104972; -75.233472 (Utica Memorial Auditorium)	New York	United States	buildings
256	2011	Tacoma Narrows Bridges^[9]	1940-1950	Tacoma 47°16′8″N 122°33′3″W / 47.26889°N 122.55083°W / 47.26889; -122.55083 (Tacoma Narrows Bridges)	Washington	United States	bridges
257	2011	Flight of Five Locks	1915	Waterford 42°48′2.8″N 73°41′29.1″W / 42.800778°N 73.691417°W / 42.800778; -73.691417 (Flight of Five Locks)	New York	United States	water transportation
258	2011	Petra	309 BC	30°19′43″N 35°26′31″E / 30.32861°N 35.44194°E / 30.32861; 35.44194 (Petra)	Ma'an Governorate	Jordan	buildings
259	2012	Zion-Mount Carmel Tunnel and Highway	1930	Zion National Park 37°12′40.7″N 112°57′29.6″W / 37.211306°N 112.958222°W / 37.211306; -112.958222	Utah	United States	roads & rails
260	2012	Huey P. Long Bridge	1935	Jefferson Parish 29°56′38.8″N 90°10′7.6″W / 29.944111°N 90.168778°W / 29.944111; -90.168778 (Huey P. Long Bridge)	Louisiana	United States	bridges
261	2012	Grand Central Terminal	1913	New York City 40°45′10.3″N 73°58′37.9″W / 40.752861°N 73.977194°W / 40.752861; -73.977194 (Grand Central Terminal)	New York	United States	roads & rails
262	2013	Titan Clydebank crane	1907	Clydebank 55°53′50.5″N 4°24′31.2″W / 55.897361°N 4.408667°W / 55.897361; -4.408667 (Titan Clydebank crane)	West Dunbartonshire	Scotland	buildings
263	2013	Waterford Bridges	1909	Troy and Waterford 42°47′19.3″N 73°40′25.8″W / 42.788694°N 73.673833°W / 42.788694; -73.673833 (Waterford Bridges)	New York	United States	bridges
264	2013	Lake Pontchartrain Causeway	1956	Lake Pontchartrain 30°11′59.2″N 90°7′21.7″W / 30.199778°N 90.122694°W / 30.199778; -90.122694 (Lake Pontchartrain Causeway)	Louisiana	United States	bridges
265	2014	The Dalles Dam	1957	Columbia River 45°36′50.3″N 121°8′3″W / 45.613972°N 121.13417°W / 45.613972; -121.13417 (The Dalles Dam)	Oregon & Washington	United States	dams
266	2015	Gladesville Bridge	1964	Sydney 33°50′31.3″S 151°8′51.8″E / 33.842028°S 151.147722°E / -33.842028; 151.147722 (Gladesville Bridge)	New South Wales	Australia	bridges
267	2016	Cape Agulhas Lighthouse	1848	L'Agulhas 34°49′45.7″S 20°0′32.4″E / 34.829361°S 20.009000°E / -34.829361; 20.009000 (Cape Agulhas Lighthouse)		South Africa	water transportation
268	2016	Arrowrock Dam	1912	Boise and Elmore 43°35′43″N 115°55′21.1″W / 43.59528°N 115.922528°W / 43.59528; -115.922528 (Arrowrock Dam)	Idaho	United States	dams
269	2016	All-American Canal^[10]	1940	Imperial County 32°52′59″N 114°27′54″W / 32.88306°N 114.46500°W / 32.88306; -114.46500 (All-American Canal)	California	United States	water supply & control
270	2016	Canal du Midi^[11]	1681	Toulouse to Étang de Thau 43°12′52.9″N 2°25′49.8″E / 43.214694°N 2.430500°E / 43.214694; 2.430500 (Canal du Midi)	Occitania	France	water transportation
271	2016	Liverpool and Manchester Railway^[12]	1830	Liverpool to Manchester 53°27′10.8″N 2°36′58.6″W / 53.453000°N 2.616278°W / 53.453000; -2.616278 (Liverpool & Manchester Railway)	North West England	England	roads & rails
272	2017	Bonnet Carré Spillway	1931	St. Charles Parish 30°0′7.2″N 90°26′23.3″W / 30.002000°N 90.439806°W / 30.002000; -90.439806 (Bonnet Carré Spillway)	Louisiana	United States	dams
273	2017	Duluth Aerial Ferry/Lift Bridge^[13]	1905	Duluth 46°46′45.8″N 92°5′35.3″W / 46.779389°N 92.093139°W / 46.779389; -92.093139 (Duluth Aerial Ferry/Lift Bridge)	Minnesota	United States	bridges
274	2017	Mississippi River Basin Model^[14]	1966	Jackson 32°18′21.8″N 90°19′8.2″W / 32.306056°N 90.318944°W / 32.306056; -90.318944 (Mississippi River Basin Model)	Mississippi	United States	research & educational
275	2017	Chaffey Brothers Irrigation Works^[15]	1887	Mildura and Renmark 34°15′1.6″S 142°13′28.8″E / 34.250444°S 142.224667°E / -34.250444; 142.224667 (Chaffey Brothers Irrigation Works)	Victoria and South Australia	Australia	water supply & control
276	2017	Qhapaq Ñan: The Great Inka Road System^[16]	1000 BC - 1533 AD	13°13′0.3″S 72°23′5.2″W / 13.216750°S 72.384778°W / -13.216750; -72.384778		Colombia to Chile	roads & rails
277	2017	Tunnel of Eupalinos^[17]	520 BC	Samos 37°41′40.6″N 26°55′48″E / 37.694611°N 26.93000°E / 37.694611; 26.93000 (Tunnel of Eupalinos)	North Aegean	Greece	tunnels
278	2018	Augusta Canal and Industrial District	1845	Augusta 33°31′17.6″N 82°0′38.9″W / 33.521556°N 82.010806°W / 33.521556; -82.010806	Georgia	United States	power generation
279	2018	Old River Station^[18]	1907	Cincinnati 39°4′17″N 84°25′40″W / 39.07139°N 84.42778°W / 39.07139; -84.42778 (Old River Station)	Ohio	United States	water supply & control
280	2018	Boundary Layer Wind Tunnel Laboratory^[19]	1965	London 43°0′14″N 81°16′32.5″W / 43.00389°N 81.275694°W / 43.00389; -81.275694	Ontario	Canada	research & educational
281	2018	Institution of Civil Engineers^[20]	1818	London 51°30′4″N 0°7′44.4″W / 51.50111°N 0.129000°W / 51.50111; -0.129000 (Institution of Civil Engineers)		England	research & educational
282	2018	Union Chain Bridge^[21]	1820	Horncliffe to Fishwick 55°45′9.3″N 2°6′24.4″W / 55.752583°N 2.106778°W / 55.752583; -2.106778 (Union Chain Bridge)		England to Scotland	bridges
283	2019	Kaibab Trail Suspension Bridge^[22]	1928	Grand Canyon 36°6′53.2″N 112°5′21.1″W / 36.114778°N 112.089194°W / 36.114778; -112.089194 (Kaibab Trail Suspension Bridge)	Arizona	United States	bridges
284	2019	Union Pacific Railroad^[23]	1868	Omaha westward 41°15′0.9″N 95°55′37.4″W / 41.250250°N 95.927056°W / 41.250250; -95.927056 (Union Pacific Railroad)	Nebraska	United States	roads & rails
285	2019	Silver Bridge Collapse - Creation of National Inspection Standards^[24]	1967	Point Pleasant 38°50′42″N 82°8′28″W / 38.84500°N 82.14111°W / 38.84500; -82.14111	West Virginia	United States	bridges
286	2020	NASA Vehicle Assembly Building^[25]	1966	Titusville 28°35′11″N 80°39′5″W / 28.58639°N 80.65139°W / 28.58639; -80.65139 (NASA Vehicle Assembly Building)	Florida	United States	buildings
287	2021	Main Avenue Bridge^[26]	1939	Cleveland 41°29′55.2″N 81°42′18.5″W / 41.498667°N 81.705139°W / 41.498667; -81.705139 (Main Avenue Bridge)	Ohio	United States	bridges
288	2021	Sydney Opera House^[15]	1973	Sydney 33°51′24″S 151°12′55″E / 33.85667°S 151.21528°E / -33.85667; 151.21528 (Sydney Opera House)	New South Wales	Australia	buildings
289	2022	David Thompson's Surveying and Mapping of the Northwest of North America^[27]	1814			Canada & United States	surveys & maps
290	2022	Portage Lake Bridge^[28]	1959	Hancock and Houghton 47°7′25.9″N 88°34′26.7″W / 47.123861°N 88.574083°W / 47.123861; -88.574083 (Portage Lake Bridge)	Michigan	United States	bridges
291	2022	Salmon Creek Dam^[29]	1914	Juneau 58°20′30″N 134°24′12″W / 58.34167°N 134.40333°W / 58.34167; -134.40333 (Salmon Creek Dam)	Alaska	United States	dams