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
BRAWLEY WASH California Good 1950 76 3,600
PHIL WASH California Good 1950 76 3,600
CATTAIL WASH California Good 1950 76 3,600
BUG WASH California Good 1950 76 3,600
GRAVEL WASH California Good 1950 76 3,600
NILAND CREEK California Good 1950 76 3,600
SALT WASH California Good 1950 76 3,600
SKEE WASH California Good 1950 76 3,600
POLO WASH California Good 1950 76 3,600
SIGNAL WASH California Good 1950 76 3,600
SAND WASH California Good 1950 76 3,600
WISTER WASH California Good 1950 76 3,600
LEVEL WASH California Good 1950 76 3,600
BUTTER WASH California Good 1950 76 3,600
FLY WASH California Good 1950 76 3,600
ZIGZAG WASH California Good 1950 76 3,600
CEDAR WASH California Fair 1950 76 3,600
ED WASH California Good 1950 76 3,600
SY WASH California Fair 1950 76 3,600
BEE WASH California Good 1950 76 3,600
CLAM WASH California Good 1950 76 3,600
SHLITZ WASH California Good 1950 76 3,600
RAY WASH California Good 1950 76 3,600
CLAY WASH California Poor 1950 76 3,600
ALKY WASH California Fair 1950 76 3,600
REED WASH California Fair 1950 76 3,650
PIKE WASH California Fair 1950 76 3,650
WIND WASH California Fair 1950 76 3,650
OTEN WASH California Fair 1950 76 3,600
PACIFIC WASH California Good 1950 76 3,600
FRINK WASH OVERFLOW California Fair 1950 76 3,600
FRINK WASH California Poor 1950 76 3,600
LUENTO WASH California Fair 1950 76 3,600
KEN WASH California Fair 1950 76 3,600
WESTSIDE MAIN CANAL California Poor 1950 76 11,714
EAST HIGHLINE CANAL California Fair 1950 76 100
ALAMO RIVER California Good 1950 76 52
RESERVATION MAIN DRAIN California Poor 1950 76 200
WESTSIDE MAIN CANAL California Fair 1950 76 50
WESTSIDE MAIN CANAL California Fair 1950 76 25
CENTRAL MAIN CANAL California Poor 1950 76 100
EAST HIGHLINE CANAL California Fair 1950 76 50
EAST HIGHLINE CANAL California Poor 1950 76 50
ALAMO RIVER California Good 1950 76 900
WESTSIDE MAIN CANAL California Fair 1950 76 80
WESTSIDE MAIN CANAL California Fair 1950 76 66
WESTSIDE MAIN CANAL California Fair 1950 76 60
WESTSIDE MAIN CANAL California Fair 1950 76 109
WESTSIDE MAIN CANAL California Fair 1950 76 743
EAST HIGHLINE CANAL California Poor 1950 76 50

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.