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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
M.I.D. LATERAL #6 California Fair 1925 101 72
M.I.D. LATERAL #6 California Fair 1925 101 154
M.I.D. LATERAL #6 California Fair 1925 101 159
T.I.D. UPPER LATERAL #2 California Fair 1925 101 317
M.I.D. LATERAL #6 California Fair 1925 101 2,284
T.I.D. UPPER LATERAL #2 California Poor 1925 101 7,057
MARIPOSA CREEK California Fair 1925 101 7,700
OWENS CREEK California Fair 1925 101 7,700
LE GRAND CANAL California Good 1925 101 218
CCID MAIN CANAL California Fair 1925 101 120
LATERAL #6 California Good 1925 101 2,325
HIGH LINE CANAL California Fair 1925 101 948
ALVES DRAIN California Good 1925 101 61
WARTHAN CREEK California Good 1925 101 1,200
FOWLER SWITCH CANAL California Fair 1925 101 13,400
FANCHER CREEK CANAL California Fair 1925 101 7,100
HERNDON CANAL California Fair 1925 101 13,654
ENTERPRISE CANAL California Fair 1925 101 7,000
WATTS CREEK California Fair 1925 101 100
BURREL DITCH California Fair 1925 101 5,600
LIBERTY DITCH California Fair 1925 101 1,900
FOWLER SWITCH CANAL California Fair 1925 101 2,300
TRAVERS CREEK California Good 1925 101 6,100
GOULD CANAL California Fair 1925 101 2,000
REDBANK SLOUGH California Good 1925 101 2,800
HOUGHTON CANAL California Fair 1925 101 3,015
HERNDON CANAL California Poor 1925 101 9,815
WAHTOKE CREEK California Fair 1925 101 350
DRY CREEK California Fair 1925 101 450
DRY CREEK California Fair 1925 101 1,600
DRY CREEK California Good 1925 101 1,600
DRY CREEK California Fair 1925 101 600
LITTLE DRY CREEK California Good 1925 101 5,000
NORTH FORK LITTLE DRY CR California Good 1925 101 600
LITTLE DRY CREEK California Good 1925 101 600
LITTLE DRY CREEK California Fair 1925 101 400
LITTLE DRY CREEK California Poor 1925 101 400
ALTA MAIN CANAL California Fair 1925 101 1,080
MURPHY SLOUGH California Fair 1925 101 500
2ND LIFT CANAL California Fair 1925 101 225
ENTERPRISE CANAL California Fair 1925 101 3,000
HARLAN STEVENS DITCH California Fair 1925 101 200
GRANT CANAL (E DITCH) California Fair 1925 101 50
ENTERPRISE CANAL California Fair 1925 101 350
CROSSCUT CANAL California Fair 1925 101 2,100
TRAVERS CREEK California Fair 1925 101 1,200
CALIFORNIA VINYARD DITCH California Fair 1925 101 1,300
COLE SLOUGH CANAL California Fair 1925 101 300
COLE SLOUGH CANAL California Fair 1925 101 3,000
COLE SLOUGH CANAL California Fair 1925 101 1,400

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