S.No. Year Added Name Built Location Region/State Country
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S.No. Year added Name Built Location Region/state Country Category 1 1966 Bollman Truss Bridge 1869 Savage Maryland United States bridges 2 1967 Bidwell Bar Bridge 1856 Oroville California United States bridges 3 1967 Erie Canal 1825 Hudson River to Lake Erie New York United States water transportation 4 1967 Middlesex Canal 1803 Middlesex County Massachusetts United States water transportation 5 1968 Central Pacific Railroad 1863-1869 Sacramento eastward California United States roads & rails 6 1968 Durango-Silverton Branch of the D&RGW RR 1882 Durango Colorado United States roads & rails 7 1968 Ellicott's Stone 1799 Mobile Alabama United States boundaries & surveys 8 1968 Acequias of San Antonio 1718 San Antonio Texas United States water supply & control 9 1968 Joining of the Rails - Transcontinental Railroad 1869 Promontory Utah United States roads & rails 10 1968 Wheeling Suspension Bridge 1849 Wheeling West Virginia United States bridges 11 1969 Alvord Lake Bridge 1889 San Francisco California United States bridges 12 1969 Charleston - Hamburg Railroad 1833 Charleston South Carolina United States roads & rails 13 1970 Ascutney Mill Dam 1834 Windsor Vermont United States dams 14 1970 Bridgeport Covered Bridge 1862 Nevada County California United States bridges 15 1970 Cornish-Windsor Covered Bridge 1866, rebuilt 1988 Windsor to Cornish Vermont and New Hampshire United States bridges 16 1970 Frankford Avenue Bridge 1697 Philadelphia Pennsylvania United States bridges 17 1970 Potowmack Canal and Locks 1799 Great Falls Virginia United States water transportation 18 1970 Theodore Roosevelt Dam & Salt River Project 1911 Arizona United States water supply & control 19 1970 Union Canal Tunnel 1828 Lebanon Pennsylvania United States water transportation 20 1971 Bethlehem Waterworks 1761 Bethlehem Pennsylvania United States water supply & control 21 1971 Druid Lake Dam 1871 Baltimore Maryland United States dams 22 1971 Eads Bridge 1874 St. Louis Missouri United States bridges 23 1971 First Owens River - Los Angeles Aqueduct 1913 Owens Valley California United States water supply & control 24 1971 Mormon Tabernacle 1867 Salt Lake City Utah United States buildings 25 1972 Cabin John Aqueduct 1863 Cabin John Maryland United States water supply & control 26 1972 Chesbroughs Water Supply System Chicago 1869 Chicago Illinois United States water supply & control 27 1972 Brooklyn Bridge 1883 New York City New York United States bridges 28 1972 Gunnison Tunnel 1909 Montrose Colorado United States tunnels 1848, Pennsylvania & 29 1972 Roebling's Delaware Aqueduct of the Delaware & Hudson Canal restored 1983 Lackawaxen to Minisink Ford New York United States water transportation 30 1972 Miami Conservancy District 1922 near Dayton Ohio United States water supply & control 31 1973 Buffalo Bill Dam 1910 Cody Wyoming United States dams 32 1973 Cheesman Reservoir 1905 Southwest of Denver Colorado United States dams 33 1973 Embudo Stream Gauging Station 1889 Embudo New Mexico United States water supply & control 34 1973 Ingalls Building 1903 Cincinnati Ohio United States buildings 35 1973 Pelton Impulse Water Wheel 1878 Camptonville California United States power generation 36 1973 Starrucca Viaduct 1848 Lanesboro Pennsylvania United States bridges 1893 37 1974 Kansas City Park and Boulevard System to 1915 Kansas City Missouri United States civil engineering profession 38 1974 Milwaukee Metropolitan Sewage Treatment Plant, home of Milorganite1919 Milwaukee Wisconsin United States water supply & control 39 1974 Philadelphia Municipal Water Supply 1801 Philadelphia Pennsylvania United States water supply & control 40 1974 Stone Arch Bridge 1883 Minneapolis Minnesota United States bridges 41 1975 Castillo de San Marcos 1695 St. Augustine Florida United States buildings 42 1975 Croton Water Supply System 1842 New York City New York United States water supply & control 43 1975 Folsom Hydroelectric Power System 1895 Folsom California United States power generation 44 1975 Granite Railway 1826 Quincy Massachusetts United States roads & rails 45 1975 Hoosac Tunnel 1875 Berkshire County Massachusetts United States tunnels 46 1975 Lawrence Experiment Station 1886 Lawrence Massachusetts United States civil engineering profession 47 1975 Marlette Lake Water System 1873 to 1887 Virginia City Nevada United States water supply & control 48 1975 Mount Washington Cog Railway 1869 Mount Washington New Hampshire United States roads & rails 49 1975 Smithfield Street Bridge 1883 Pittsburgh Pennsylvania United States bridges 50 1975 Tunkhannock Viaduct 1915 Nicholson Pennsylvania United States bridges 51 1976 Crozet's Blue Ridge Tunnel 1858 Waynesboro Virginia United States tunnels New Mexico and 52 1976 Cumbres and Toltec Scenic Railroad 1880 Chama, New Mexico to Antonito, Colorado Colorado United States roads & rails 53 1976 Elephant Butte Dam 1916 Truth or Consequences New Mexico United States dams 54 1976 First Concrete Pavement 1893 Bellefontaine Ohio United States roads & rails 55 1976 International Boundary Marker No. 1 1855 Doña Ana County New Mexico United States boundaries & surveys 56 1976 King's Road 1766 to 1775 New Smyrna Florida United States roads & rails Cumberland, Maryland to 57 1976 National Road 1811-1839 Vandalia, Illinois Midwest United States roads & rails 58 1977 Charlestown Naval Dry Dock 1833 Boston Massachusetts United States water transportation 59 1977 City Plan of Savannah 1733 Savannah Georgia United States civil engineering profession 60 1977 Great Falls Raceway and Power System 1800 Paterson New Jersey United States power generation 61 1977 First New York Subway 1904 New York City New York United States roads & rails 62 1977 Mason-Dixon line 1767 Maryland & Pennsylvania United States boundaries & surveys 63 1977 Minot's Ledge Lighthouse 1860 off Scituate Massachusetts United States water transportation 64 1977 Mullan Road 1862 Walla Walla Washington United States roads & rails 65 1977 Gosport Naval Dry Docks 1833 Portsmouth Virginia United States water transportation 66 1977 Reversal of the Chicago River 1900 Chicago Illinois United States water transportation 67 1977 Vulcan Street Plant 1882 Appleton Wisconsin United States power generation 68 1977 William E. Ward House 1876 Rye New York United States buildings 69 1978 Boston Subway 1897 Boston Massachusetts United States roads & rails 70 1978 Dunlap's Creek Bridge 1839 Brownsville Pennsylvania United States bridges 71 1978 Hudson and Manhattan Railroad Tunnel 1908 Jersey City to New York City New Jersey & New York United States tunnels 72 1978 Newark International Airport 1928 Newark New Jersey United States aviation 73 1978 United States Military Academy 1813 West Point New York United States civil engineering profession 74 1979 Cleveland Hopkins Airport 1925 Cleveland Ohio United States aviation 75 1979 Fink Deck Truss Bridge 1870 Lynchburg Virginia United States bridges 76 1979 Fink Through Truss Bridge 1858 Hamden New Jersey United States bridges 77 1979 Iron Bridge 1779 Ironbridge West Midlands England bridges 78 1979 Moffat Tunnel 1928 Winter Park Colorado United States tunnels 79 1979 Rockville Bridge 1902 Harrisburg Pennsylvania United States bridges 80 1980 Goodyear Airdock 1929 Akron Ohio United States aviation 81 1980 Hydraulic-Inclined Plane System of the Morris Canal 1831 Stanhope New Jersey United States water transportation 82 1981 Borden Base Line 1831 Hatfield Massachusetts United States boundaries & surveys 83 1981 Chain of Rocks Water Purification Plant 1904 St. Louis Missouri United States water supply & control 84 1981 Charles River Basin Project 1910 Boston Massachusetts United States water supply & control 85 1981 Cortland Street Drawbridge 1902 Chicago Illinois United States bridges 86 1981 George Washington Bridge 1931 Fort Lee to New York City New Jersey & New York United States bridges 87 1981 Louisville Water Works 1875 to 1896 Louisville Kentucky United States water supply & control 88 1981 Montgomery Bell's Tunnel 1818 Cheatham County Tennessee United States tunnels 89 1981 Snoqualmie Falls Cavity Generating Station 1899 Snoqualmie Washington United States power generation 90 1981 Union Station 1894 St. Louis Missouri United States roads & rails 91 1981 Washington Monument 1885 Washington District of Columbia United States buildings 92 1981 Whipple Truss Bridge 1855 Schenectady New York United States bridges 93 1982 Carrollton Viaduct 1829 Baltimore Maryland United States bridges 94 1982 Detroit-Windsor Tunnel 1930 Detroit Michigan United States tunnels 95 1982 Eads South Pass Navigation Works 1879 Venice Louisiana United States water transportation 96 1982 Holland Tunnel 1927 Jersey City to New York City New Jersey & New York United States tunnels 97 1982 John A. Roebling Suspension Bridge 1866 Cincinnati Ohio United States bridges 98 1982 Kinzua Railway Viaduct 1882 McKean County Pennsylvania United States bridges 99 1982 Rogue River Bridge 1931 Gold Beach Oregon United States bridges 100 1982 Second Street Bridge 1886 Allegan Michigan United States bridges 101 1982 Watertown Arsenal 1859 Watertown Massachusetts United States civil engineering profession 102 1983 Atlantic City Convention Hall 1929 Atlantic City New Jersey United States buildings 103 1983 Bailey Island Bridge 1928 Harpswell Maine United States bridges 104 1983 Blenheim Bridge 1855 North Blenheim New York United States bridges 105 1983 Iron Building of the U.S. Army Arsenal 1859 Watervliet New York United States buildings 106 1983 Ohio Canal System 1848 Akron Ohio United States water