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Historic Bridges in California

4,414 bridges built before 1951 in California still in service today.

Bridges Built Before 1951

The United States has 4,414 bridges in California 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.

Clear
Bridge State Condition Year Built Age (Years) ADT
MORMON SLOUGH California Fair 1915 111 2,700
YOUNGS CREEK California Fair 1915 111 379
DEER CREEK California Fair 1915 111 120
WOODS CREEK California Fair 1915 111 130
SAN LORENZO CREEK California Fair 1915 111 3,500
CORDILLERAS CREEK California Fair 1915 111 25,000
BEAN CREEK California Fair 1915 111 1,000
BEAN CREEK California Good 1915 111 500
CASSERLY CREEK TRIB NO 1 California Poor 1915 111 500
SAN TOMAS CREEK California Poor 1915 111 6,740
SAN TOMAS CREEK California Fair 1915 111 6,740
LITTLE LLAGAS CRK California Good 1915 111 2,410
RED FOX CREEK California Good 1915 111 1,690
CHURCH CREEK California Good 1915 111 1,070
PENITENCIA CREEK California Good 1915 111 1,500
M.I.D. MAIN CANAL California Fair 1915 111 20,200
M.I.D. CANAL California Fair 1915 111 20,200
SALADO CREEK California Fair 1915 111 6,450
BLITZ CREEK California Good 1915 111 12,000
OUTSIDE CANAL California Fair 1915 111 344
SALINAS RIVER California Poor 1915 111 530
LITTLE CHOLAME CREEK California Fair 1915 111 240
ALTA CANAL California Fair 1915 111 100
CAMERON CREEK California Fair 1915 111 70
E BR SAN LUIS OBISPO CRK California Fair 1915 111 4,717
ATASCADERO CREEK California Good 1915 111 20,000
KERN ISLAND CNL CNTRL BR California Fair 1915 111 4,016
KERN ISLAND CANAL California Fair 1915 111 4,016
SAN YSIDRO CREEK California Fair 1915 111 76,000
ROMERO CREEK California Fair 1915 111 76,000
RINCON CREEK California Fair 1915 111 191
MISSION CREEK California Fair 1915 111 3,200
ELLSWORTH BARRANCA California Good 1915 111 1,500
GOPHER CANYON CREEK California Good 1915 111 1,430
STATE ROUTE 163 California Good 1915 111 3,539
REDWOOD CREEK California Fair 1916 110 78
CAMPBELL SLOUGH California Fair 1916 110 1,500
S FK WILLOW CREEK California Fair 1916 110 46
LITTLE CHICO CREEK California Fair 1916 110 5,200
BEAR R CAMP FARWEST WIER California Fair 1916 110 540
QUAKER DRAW California Good 1916 110 1,000
SMITH CREEK California Fair 1916 110 1,500
UNION SCHOOL SLOUGH California Fair 1916 110 115
SACRAMENTO BYPASS (WEIR) California Fair 1916 110 2,889
RILEY RAVINE California Fair 1916 110 1,000
ARCADE CREEK California Good 1916 110 17,544
ARROYO CALERO California Fair 1916 110 3,760
WATERFORD CANAL California Fair 1916 110 9,100
TUOLUMNE RIVER California Fair 1916 110 16,815
GASBURG CREEK California Fair 1916 110 1,724

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