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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
RR MBTA Massachusetts Fair 1900 126 5,560
WATER CHARLES RIVER Massachusetts Fair 1900 126 51,270
RR CSX Massachusetts Fair 1900 126 3,600
RR PWRR Massachusetts Good 1900 126 14,986
RR HRR Massachusetts Poor 1900 126 21,457
RR CSX Massachusetts Fair 1900 126 29,800
WATER HOUSATONIC RIVER Massachusetts Fair 1900 126 23,286
WATER CATACUNEMAUG BROOK Massachusetts Good 1900 126 8,180
RR CSX Massachusetts Good 1900 126 4,503
RR MBTA/CSX Massachusetts Good 1900 126 900
WATER SANDERSDALE CANAL Massachusetts Fair 1900 126 13,189
WATER ELIZABETH BROOK Massachusetts Poor 1900 126 10
WATER HOP BROOK Massachusetts Fair 1900 126 9,379
WATER MUMFORD RIVER Massachusetts Good 1900 126 12,888
WATER BLACKSTONE RIVER Massachusetts Good 1900 126 7,627
RR MBTA/CSX Massachusetts Fair 1900 126 22,500
WATER WEWEANTIC RIVER Massachusetts Poor 1900 126 9,300
WATER FLAT BROOK Massachusetts Fair 1900 126 2,948
RR MBTA/CSX Massachusetts Fair 1900 126 11,236
WATER WHITMAN RIVER Massachusetts Fair 1900 126 400
RR PWRR/BMRR Massachusetts Fair 1900 126 7,280
HIGH BANK CREEK Michigan Poor 1900 126 197
HIGHBANK CREEK Michigan Fair 1900 126 133
BETSIE RIVER Michigan Poor 1900 126 95
BETSIE RIVER Michigan Poor 1900 126 32
TEKONSHA CREEK&POWERS Michigan Poor 1900 126 30
COLDWATER RIVER Michigan Poor 1900 126 111
STURGEON RIVER Michigan Poor 1900 126 3
STURGEON RIVER Michigan Poor 1900 126 25
AU SABLE RIVER Michigan Fair 1900 126 560
RIVER STYX DRAIN Michigan Fair 1900 126 111
BOVEE DRAIN Michigan Poor 1900 126 56
TRAPROCK RIVER Michigan Poor 1900 126 80
WEST CEDAR DRAIN Michigan Poor 1900 126 250
CHICAGON CREEK Michigan Poor 1900 126 142
BETSIE RIVER Michigan Poor 1900 126 100
BASS LAKE OUTLET Michigan Fair 1900 126 1,000
SWAN CREEK Michigan Fair 1900 126 2,200
S BR PERE MARQUETTE RIVR Michigan Poor 1900 126 100
CARR CREEK Michigan Fair 1900 126 300
BIG SABLE RIVER Michigan Poor 1900 126 200
N BR CHIPPEWA RIVER Michigan Fair 1900 126 67
TITTABAWASSEE RIVER Michigan Fair 1900 126 4,550
OTTAWA LAKE DRAIN Michigan Poor 1900 126 480
NORRIS CREEK Michigan Fair 1900 126 2,310
SADONY BAYOU Michigan Poor 1900 126 440
RUDDIMAN CREEK Michigan Good 1900 126 12,520
C O RAILROAD Michigan Poor 1900 126 1,972
SYLVAN LAKE Michigan Fair 1900 126 180
MONTELLO PARK DRAIN Michigan Poor 1900 126 1,920

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