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Historic Bridges

94,376 bridges built before 1951 across the United States still in service today.

Bridges Built Before 1951

The United States has 94,376 bridges built before 1951 that remain in active service. These structures are 75+ years old — many predate modern engineering codes and were not designed for today's traffic volumes and vehicle weights. The average design life of a bridge is 50 years, making these aging structures a significant infrastructure concern.

Bridge State Condition Year Built Age (Years) ADT
WILLIMANTIC RIVER Connecticut Fair 1900 126 1,800
METRO NORTH RAILROAD Connecticut Fair 1900 126 9,000
METRO-NORTH RAILROAD Connecticut Fair 1900 126 14,800
HARBOR BROOK Connecticut Fair 1900 126 2,700
WHARTON BROOK Connecticut Fair 1900 126 4,525
FARMINGTON CANAL GREENWA Connecticut Fair 1900 126 4,200
QUINNIPIAC RIVER Connecticut Fair 1900 126 2,400
METRO NORTH RAILROAD Connecticut Fair 1900 126 1,853
METRO-NORTH RAILROAD Connecticut Fair 1900 126 3,100
METRO-NORTH RAILROAD Connecticut Fair 1900 126 1,058
RIPPOWAM RIVER Connecticut Fair 1900 126 7,750
PRIVATE ROAD Connecticut Fair 1900 126 14,100
MILL RIVER Connecticut Fair 1900 126 1,365
PEQUABUCK RIVER Connecticut Good 1900 126 12,415
PEQUABUCK RIVER Connecticut Poor 1900 126 2,805
COGINCHAUG RIVER Connecticut Fair 1900 126 1,654
MISERY BROOK Connecticut Fair 1900 126 5,826
HOCKANUM RIVER Connecticut Fair 1900 126 1,655
ROCKLEDGE BROOK Connecticut Fair 1900 126 380
LITTLE RIVER Connecticut Poor 1900 126 1,178
NATCHAUG RIVER Connecticut Fair 1900 126 398
TEN MILE RIVER Connecticut Good 1900 126 180
HOP RIVER Connecticut Good 1900 126 1,500
IRON STREAM Connecticut Fair 1900 126 258
NONEWAUG RIVER Connecticut Fair 1900 126 318
MASHAMOQUET BROOK Connecticut Fair 1900 126 118
METRO NORTH RAILROAD Connecticut Fair 1900 126 10,800
BROAD BROOK Connecticut Fair 1900 126 148
METRO NORTH RAILROAD Connecticut Fair 1900 126 3,400
METRO NORTH RAILROAD Connecticut Fair 1900 126 4,700
MASHAMOQUET BROOK Connecticut Good 1900 126 132
MASHAMOQUET BROOK Connecticut Poor 1900 126 371
CHERRY BROOK Connecticut Fair 1900 126 224
WILLIMANTIC RIVER Connecticut Fair 1900 126 527
BRANDYWINE CREEK Delaware Fair 1900 126 2,103
BRANDYWINE CREEK Delaware Fair 1900 126 9,627
CSX RAILROAD Delaware Good 1900 126 23,743
CSX RAILROAD Delaware Fair 1900 126 99
PEDESTRIAN PATH Delaware Fair 1900 126 9,804
MISPILLION RIVER Delaware Fair 1900 126 99
C&O CANAL District of Columbia Good 1900 126 2,000
C&O CANAL District of Columbia Good 1900 126 2,000
C&O CANAL District of Columbia Good 1900 126 2,000
C&O CANAL District of Columbia Good 1900 126 2,000
ROCK CREEK District of Columbia Fair 1900 126 4,000
Little Creek Florida Fair 1900 126 150
Moore Creek Florida Poor 1900 126 800
PINEY WOODS CREEK Georgia Good 1900 126 830
MAILI STREAM Hawaii Fair 1900 126 280
KAWAINUI STREAM Hawaii Poor 1900 126 400

Historic Bridges by State

States ranked by number of bridges built before 1951 still in service.

StateHistoric BridgesOldest YearAvg Age
Texas 8,191 1900 89 yrs
Pennsylvania 6,062 1697 99 yrs
Kansas 5,656 1870 93 yrs
Oklahoma 5,554 1900 89 yrs
Missouri 4,522 1874 96 yrs
California 4,414 1860 91 yrs
New York 3,831 1800 96 yrs
Ohio 3,386 1828 101 yrs
Nebraska 3,270 1888 91 yrs
Illinois 3,065 1863 99 yrs
Iowa 3,036 1876 98 yrs
Tennessee 2,857 1841 89 yrs
Alabama 2,703 1800 90 yrs
Indiana 2,682 1838 98 yrs
Virginia 2,504 1820 92 yrs
Kentucky 2,241 1835 89 yrs
Arkansas 1,932 1860 89 yrs
Georgia 1,832 1872 88 yrs
New Jersey 1,814 1792 99 yrs
Michigan 1,528 1867 94 yrs
Massachusetts 1,481 1764 107 yrs
Wisconsin 1,333 1887 92 yrs
South Carolina 1,282 1910 89 yrs
West Virginia 1,245 1817 96 yrs
North Carolina 1,203 1900 89 yrs
Arizona 1,189 1900 90 yrs
Washington 1,188 1900 92 yrs
South Dakota 1,118 1900 92 yrs
Minnesota 1,035 1884 94 yrs
Vermont 987 1824 99 yrs
Maryland 968 1809 99 yrs
Mississippi 908 1900 87 yrs
Connecticut 860 1832 96 yrs
Colorado 857 1887 89 yrs
Oregon 790 1899 92 yrs
New Mexico 719 1908 87 yrs
New Hampshire 716 1832 97 yrs
Florida 707 1900 87 yrs
North Dakota 685 1885 91 yrs
Montana 662 1881 90 yrs
Maine 630 1854 92 yrs
Louisiana 614 1908 87 yrs
Puerto Rico 463 1842 95 yrs
Hawaii 386 1900 95 yrs
Idaho 354 1908 90 yrs
Utah 217 1905 88 yrs
Wyoming 191 1908 88 yrs
Rhode Island 179 1810 107 yrs
Delaware 122 1839 99 yrs
Nevada 89 1900 89 yrs
District of Columbia 81 1831 94 yrs
Alaska 37 1910 86 yrs

About Historic Bridge Data

Bridges built before 1951 are classified as historic in this database. Many were designed to 1940s standards with lower load limits and narrower lanes. While FHWA requires regular inspections of all bridges regardless of age, older structures often require more frequent monitoring and rehabilitation investment.

All Bridges Poor Condition Scour Critical Bridge Stats