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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
OVER ROSS RUN Pennsylvania Fair 1910 116 50
WEBSTER RUN Pennsylvania Fair 1910 116 59
TENMILE CREEK Pennsylvania Poor 1910 116 1
ROBERTS RUN Pennsylvania Fair 1910 116 100
CROOKED CREEK Pennsylvania Fair 1910 116 50
Richards Run Pennsylvania Fair 1910 116 150
MILL RUN Pennsylvania Fair 1910 116 50
NORFOLK AND SOUTHERN RR Pennsylvania Good 1910 116 5,419
CONOY CREEK Pennsylvania Fair 1910 116 5,680
RR ABANDONED Pennsylvania Fair 1910 116 16,440
COPLAY CREEK Pennsylvania Fair 1910 116 11,880
ONTELAUNEE CREEK Pennsylvania Poor 1910 116 200
KITCHEN CREEK Pennsylvania Fair 1910 116 55
HUNTINGTON CREEK Pennsylvania Poor 1910 116 55
MILL CREEK Pennsylvania Fair 1910 116 1,400
BENNETT BROOK Pennsylvania Fair 1910 116 4,775
W BR TUNUNGWANT CREEK Pennsylvania Poor 1910 116 150
IRISH HOLLOW CREEK Pennsylvania Fair 1910 116 200
POTATO CREEK Pennsylvania Fair 1910 116 40
OVER BIG RUN TRIB Pennsylvania Poor 1910 116 741
MUNNELL RUN Pennsylvania Poor 1910 116 951
JACKS CREEK Pennsylvania Fair 1910 116 50
POHOPOCO CREEK Pennsylvania Fair 1910 116 1,357
MCMICHAEL CREEK Pennsylvania Poor 1910 116 1,114
MARSHALL CREEK Pennsylvania Poor 1910 116 100
UNAMI CREEK Pennsylvania Fair 1910 116 320
SPROGELS RUN Pennsylvania Poor 1910 116 14,340
WISSAHICKON CREEK Pennsylvania Fair 1910 116 1,944
SAW MILL RUN Pennsylvania Fair 1910 116 3,300
SEPTA LEASED TO PN Pennsylvania Fair 1910 116 300
HOKENDAUQUA CREEK Pennsylvania Poor 1910 116 30
LITTLE BUSHKILL CREEK Pennsylvania Fair 1910 116 200
SLATEFORD CREEK Pennsylvania Fair 1910 116 200
LEHIGH CANAL + NORFORK Pennsylvania Poor 1910 116 80
MAHANOY CREEK Pennsylvania Poor 1910 116 —
SHAMOKIN CREEK Pennsylvania Fair 1910 116 2,900
LIMESTONE RUN Pennsylvania Fair 1910 116 4,900
SHERMANS CREEK Pennsylvania Poor 1910 116 117
LUDINGTON RUN Pennsylvania Fair 1910 116 92
OSWAYO CREEK Pennsylvania Good 1910 116 50
MAHANOY CREEK Pennsylvania Poor 1910 116 20
BRUSH CREEK Pennsylvania Poor 1910 116 34
LAUREL HILL CREEK Pennsylvania Good 1910 116 96
BEAVER DAM CREEK Pennsylvania Fair 1910 116 50
SANDY RUN Pennsylvania Fair 1910 116 25
EAST BR. TUNKHANNOCK CR. Pennsylvania Poor 1910 116 20
OVER LITTLE SUGAR CREEK Pennsylvania Poor 1910 116 200
OVER TIDIOUTE CREEK Pennsylvania Fair 1910 116 376
OVER CALDWELL CREEK Pennsylvania Poor 1910 116 75
OVER SPRING CREEK Pennsylvania Poor 1910 116 50

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