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Scour Critical Bridges in California

623 bridges in California at risk from water erosion around foundations.

Scour Critical Bridges

Scour is the erosion of soil and rock around a bridge's foundation caused by moving water. When foundations are exposed or undermined, a bridge can collapse even if its deck and superstructure are in good condition. Scour is the leading cause of bridge failures in the US. These 623 bridges in California have been identified as vulnerable to scour damage.

Clear
Bridge State Scour Status Condition Year Built ADT
LITTLE DRY CREEK California Scour Critical — Countermeasures Installed Fair 1928 24
SCOTT RIVER California Scour Critical — Countermeasures Installed Poor 1909 20
LITTLE CASTLE CREEK California Scour Critical — Countermeasures Installed Fair 1917 20
MILL CREEK California Scour Critical — Countermeasures Installed Fair 1960 20
DRY CREEK California Scour Critical — Countermeasures Installed Poor 1930 20
BIG CREEK California Scour Critical — Countermeasures Installed Poor 1940 20
OUTLET CREEK California Scour Critical — Countermeasures Installed Poor 1955 19
DUTCHMAN CREEK California Scour Critical — Countermeasures Installed Good 1960 16
E FK OF N FK TRINITY RIV California Scour Critical — Countermeasures Installed Fair 1938 15
SALT CREEK California Scour Critical — Countermeasures Installed Fair 1950 15
CACHE CREEK California Scour Critical — Countermeasures Installed Poor 1930 15
ORTIZ DRAIN California Scour Critical — Countermeasures Installed Fair 1950 13
FIRST GULCH California Scour Critical — Countermeasures Installed Fair 1950 10
EAST FORK MILL CREEK California Scour Critical — Countermeasures Installed Poor 1950 10
WEST BRANCH MILL CREEK California Scour Critical — Countermeasures Installed Poor 1950 10
EAST FORK MILL CREEK California Scour Critical — Countermeasures Installed Poor 1950 10
MAJORS CREEK California Scour Critical — Countermeasures Installed Poor 1970 10
HERBERT CREEK California Scour Critical — Countermeasures Installed Poor 1985 10
LE GRAND CANAL California Scour Critical — Countermeasures Installed Fair 1967 10
LIL SAN GORGONIO CREEK California Scour Critical — Countermeasures Installed Fair 1969 8
JANE CREEK California Scour Critical — Countermeasures Installed Fair 1950 5
SQUAW CREEK California Scour Critical — Countermeasures Installed Poor 1983 1
IVANPAH DITCH California Scour Critical — Countermeasures Installed Good 1963 1

Scour Critical Rating Codes

Code 2 — UnaddressedBridge is scour critical with no countermeasures installed. The foundation is vulnerable and no protective action has been taken.
Code 3 — Countermeasures InstalledProtective measures (riprap, sheet piling, etc.) have been installed to reduce scour risk, but the bridge remains classified as scour critical.
Code 6 — Countermeasures IneffectiveProtective measures were installed but have been assessed as ineffective. The bridge requires re-evaluation and additional action.

About Scour Critical Bridges

Scour critical bridges have been identified through underwater inspection or analysis as having foundations that are unstable or could become unstable during flood conditions. FHWA requires action plans for all scour critical bridges. Famous scour failures include the 1987 Schoharie Creek Bridge collapse in New York.

All Bridges Poor Condition Historic Bridges Bridge Stats