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Infrastructure

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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
QUAKAKE CREEK Pennsylvania Poor 1913 113 100
SOUTH BR OF FRENCH CREEK Pennsylvania Poor 1913 113 73
BRANCH VALLEY CREEK Pennsylvania Poor 1913 113 140
DEER CREEK Pennsylvania Poor 1913 113 30
ROARING CREEK Pennsylvania Fair 1913 113 109
OVER MILL RUN Pennsylvania Fair 1913 113 1,500
TRIB YELLOW BREECHES CR Pennsylvania Fair 1913 113 525
OVER FOUR MILE CREEK Pennsylvania Fair 1913 113 3,114
LAMSON RUN TRIBUTARY Pennsylvania Poor 1913 113 695
LAMSON RUN Pennsylvania Poor 1913 113 610
COAL LICK RUN Pennsylvania Poor 1913 113 200
COFFEE RUN Pennsylvania Poor 1913 113 42
SANDY LICK CREEK Pennsylvania Fair 1913 113 4,430
N.S. RR Pennsylvania Fair 1913 113 1,119
OVER HETTENBAUGH RUN Pennsylvania Fair 1913 113 163
CAMP RUN Pennsylvania Fair 1913 113 50
CATASAUQUA CREEK Pennsylvania Fair 1913 113 5,758
LEHIGH CRK CITY STREETS Pennsylvania Fair 1913 113 18,800
TROUT CREEK Pennsylvania Fair 1913 113 100
RIDGE VALLEY CREEK Pennsylvania Fair 1913 113 256
LIMESTONE RUN Pennsylvania Fair 1913 113 100
HOKENDAUQUA CREEK Pennsylvania Fair 1913 113 90
ALLEGHENY CREEK Pennsylvania Fair 1913 113 450
OVER QUAKER RUN Pennsylvania Fair 1913 113 1,018
SCHWABEN CREEK Pennsylvania Good 1913 113 50
NORFOLK SOUTHERN RR Pennsylvania Fair 1913 113 68
SALT LICK CREEK Pennsylvania Poor 1913 113 100
NS R/R MON CITY ST Pennsylvania Fair 1913 113 2,889
PIKE RUN Pennsylvania Fair 1913 113 589
MONTGOMERY RUN Pennsylvania Good 1913 113 80
CHARTIERS CREEK TRIB. Pennsylvania Poor 1913 113 300
CROSS CREEK TRIB Pennsylvania Poor 1913 113 30
CROSS CREEK TRIB. Pennsylvania Poor 1913 113 30
AMTRAK (MAIN LINE)MP5.69 Pennsylvania Poor 1913 113 7,081
AMTRAK (NE Corridor) Pennsylvania Poor 1913 113 2,000
SEPTA (MAIN LINE) Pennsylvania Fair 1913 113 5,800
Conrail Pennsylvania Poor 1913 113 7,500
ELK CREEK Pennsylvania Fair 1913 113 25
ROARING BROOK Rhode Island Fair 1913 113 1,800
WOONASQUATUCKET RIVER Rhode Island Good 1913 113 14,472
PAWCATUCK RIVER Rhode Island Fair 1913 113 303
P&W RR Rhode Island Poor 1913 113 1,690
WEST RIVER Rhode Island Poor 1913 113 2,222
P&W RR Rhode Island Fair 1913 113 3,636
CSXT RR South Carolina Poor 1913 113 3,500
CK South Dakota Poor 1913 113 92
WOLF CK South Dakota Poor 1913 113 43
SNAKE CREEK South Dakota Poor 1913 113 31
MEDICINE KNOLL CK South Dakota Poor 1913 113 10
TURKEY RIDGE CK South Dakota Poor 1913 113 30

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