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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
Baldwin Slough Alabama Fair 1900 126 —
Fish Creek Arizona Good 1900 126 30
Wash Arizona Fair 1900 126 6,735
Middle March Creek Arizona Fair 1900 126 100
Stockton Drain Arizona Fair 1900 126 700
San Jose Canal Arizona Fair 1900 126 19
Ash Creek Arizona Fair 1900 126 10
Union Canal Arizona Poor 1900 126 203
Union Canal Arizona Fair 1900 126 3,700
Stockton Drain Arizona Fair 1900 126 200
Rocky John Canyon Arizona Fair 1900 126 42
Silver Creek Arizona Fair 1900 126 400
Nogales Wash Arizona Fair 1900 126 1,000
Green Gulch Arizona Fair 1900 126 330
Small Wash Arizona Fair 1900 126 6,995
Small Wash Arizona Fair 1900 126 6,129
Casa Grande Canal Ext Arizona Poor 1900 126 450
Sand Tanks Wash Arizona Fair 1900 126 132
Concho Creek Arizona Fair 1900 126 260
Rio De Flag Arizona Fair 1900 126 1,357
Rio De Flag Arizona Fair 1900 126 310
Rio De Flag Arizona Fair 1900 126 310
Rio De Flag Arizona Fair 1900 126 2,000
Chase Creek Arizona Fair 1900 126 411
Desert Wash Arizona Fair 1900 126 2,200
Small Wash Arizona Fair 1900 126 971
Middleton Creek Arizona Fair 1900 126 148
Storm Drain Arizona Poor 1900 126 300
MIDDLE CREEK California Fair 1900 126 135
LOS MOLINOS CREEK California Fair 1900 126 6,800
STONY CREEK California Fair 1900 126 11
MUD CREEK California Fair 1900 126 744
N FK AMERICAN RIVER California Fair 1900 126 125
HEADER DRAW California Fair 1900 126 2,650
SONOMA CREEK California Good 1900 126 550
CALABAZAS CREEK California Fair 1900 126 500
LAKE CHABOT CREEK California Good 1900 126 33,600
REDWOOD RD FLD CNTRL CH California Good 1900 126 29,900
PILARCITOS CREEK California Poor 1900 126 2,350
BEAR CREEK California Fair 1900 126 500
SAN MATEO CREEK California Fair 1900 126 1,000
SAN MATEO CREEK California Fair 1900 126 1,000
LOS GATOS CREEK California Good 1900 126 43,000
T.I.D. CERES MAIN CANAL California Fair 1900 126 2,500
CENTRAL CANAL California Fair 1900 126 15,202
SAN YSIDRO DITCH California Good 1900 126 52,000
TRAMWAY California Good 1900 126 50
METRO NORTH RAILROAD Connecticut Fair 1900 126 7,100
METRO NORTH RAILROAD Connecticut Fair 1900 126 9,300
FARM RIVER Connecticut Fair 1900 126 5,500

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