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Historic Bridges

94,381 bridges built before 1951 across the United States still in service today.

Bridges Built Before 1951

The United States has 94,381 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
W.BR.CONOCOCHEAGUE CREEK Pennsylvania Fair 1825 201 609
CONODOGUINET CREEK Pennsylvania Poor 1825 201 609
CONOCOCHEAGUE CREEK W.BR Pennsylvania Fair 1825 201 250
WATER PASKAMANSETT RIVER Massachusetts Fair 1826 200 9,957
NOCKAMIXON CREEK Pennsylvania Fair 1826 200 100
W.BR.BRANDYWINE CREEK Pennsylvania Fair 1826 200 4,084
INDIAN CREEK Pennsylvania Poor 1826 200 100
BIG SEWICKLEY CREEK Pennsylvania Fair 1827 199 2,000
TRIB CONODOGUINET CR Pennsylvania Fair 1827 199 702
CONODOGUINET CREEK Pennsylvania Fair 1827 199 956
SALT FORK (S BRIDGE) Ohio Poor 1828 198 50
CONOCOCHEAGUE CREEK Pennsylvania Fair 1828 198 3,700
LITTLE LEHIGH CREEK Pennsylvania Poor 1828 198 1,000
SOUTHAMPTON CREEK Pennsylvania Fair 1828 198 11,488
CONOCOCHEAGUE CREEK Maryland Fair 1829 197 4,532
CONOCOCHEAGUE CREEK Maryland Good 1829 197 265
GROVE CREEK Maryland Fair 1830 196 194
ANTIETAM CREEK Maryland Fair 1830 196 1,173
VALLEY RUN Ohio Poor 1830 196 209
DELAWARE CANAL Pennsylvania Poor 1830 196 —
BRANCH SKIPPACK CREEK Pennsylvania Poor 1830 196 2,907
CHILLISQUAQUE CREEK Pennsylvania Fair 1830 196 100
C&O CANAL District of Columbia Fair 1831 195 800
WATER WESTERN CANAL Massachusetts Fair 1831 195 17,900
MAHONING RIVER E BRANCH Ohio Fair 1831 195 2,000
SR 598 WHITEHEAD HIGHWAY Connecticut Fair 1832 194 12,900
ANTIETAM CREEK Maryland Fair 1832 194 720
LITTLE ANTIETAM CREEK Maryland Good 1832 194 362
AMMONOOSUC R NHRR(ABD) New Hampshire Fair 1832 194 96
ASHUELOT RIVER New Hampshire Fair 1832 194 2,191
JACOBS CREEK New Jersey Fair 1832 194 13,858
DELAWARE CANAL Pennsylvania Fair 1832 194 660
DELAWARE CANAL Pennsylvania Fair 1832 194 10
DELAWARE CANAL Pennsylvania Poor 1832 194 40
DELAWARE CANAL Pennsylvania Poor 1832 194 4
DELAWARE CANAL Pennsylvania Fair 1832 194 60
DELAWARE CANAL Pennsylvania Poor 1832 194 380
DELAWARE CANAL Pennsylvania Fair 1832 194 15
DELAWARE CANAL Pennsylvania Poor 1832 194 20
DELAWARE CANAL Pennsylvania Fair 1832 194 10
DELAWARE CANAL Pennsylvania Poor 1832 194 6
DELAWARE CANAL Pennsylvania Poor 1832 194 30
DELAWARE CANAL Pennsylvania Poor 1832 194 60
DELAWARE CANAL Pennsylvania Poor 1832 194 200
LAUREL RUN Pennsylvania Poor 1832 194 500
Delaware Canal Pennsylvania Good 1832 194 20
ANTIETAM CREEK Maryland Fair 1833 193 2,592
ANTIETAM CREEK Maryland Good 1833 193 12,292
WATER IPSWICH RIVER Massachusetts Fair 1833 193 4,100
WATER WESTERN CANAL Massachusetts Fair 1833 193 6,600

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
Virgin Islands 5 1904 112 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