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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
SANTA ANA RIVER California Scour Critical — Countermeasures Installed Fair 1929 12,519
AUBURN RAVINE California Scour Critical — Countermeasures Installed Fair 1923 12,500
SHEEP CREEK California Scour Critical — Countermeasures Installed Good 2005 12,199
BUTTE CREEK California Scour Critical — Countermeasures Installed Fair 1949 12,054
BRUSHY CREEK California Scour Critical — Countermeasures Installed Fair 1953 12,023
GARNETT CREEK California Scour Critical — Countermeasures Installed Poor 1902 12,000
DRY CREEK California Scour Critical — Countermeasures Installed Good 1959 11,776
MCCOY WASH California Scour Critical — Countermeasures Installed Fair 1969 11,750
PALOWALLA DITCH California Scour Critical — Countermeasures Installed Good 1969 11,750
MCCOY WASH California Scour Critical — Countermeasures Installed Fair 1969 11,750
GALE DITCH California Scour Critical — Countermeasures Installed Fair 1969 11,750
PALOWALLA DITCH California Scour Critical — Countermeasures Installed Good 1969 11,750
YUBA RIVER California Scour Critical — Countermeasures Installed Poor 1957 11,630
BIG SYCAMORE CREEK California Scour Critical — Countermeasures Installed Poor 1938 11,600
HILLOCK DITCH California Scour Critical — Countermeasures Installed Good 1967 11,500
THREE STAR DITCH California Scour Critical — Countermeasures Installed Good 1967 11,500
IROLO DITCH California Scour Critical — Countermeasures Installed Good 1967 11,500
ADAIR DITCH California Scour Critical — Countermeasures Installed Good 1967 11,500
ADAIR DITCH California Scour Critical — Countermeasures Installed Good 1967 11,500
WIDE DITCH California Scour Critical — Countermeasures Installed Good 1967 11,500
HILLOCK DITCH California Scour Critical — Countermeasures Installed Good 1967 11,500
THREE STAR DITCH California Scour Critical — Countermeasures Installed Good 1967 11,500
WIDE DITCH California Scour Critical — Countermeasures Installed Good 1967 11,500
LLAGAS CREEK California Scour Critical — Countermeasures Installed Fair 1938 11,440
NOJOQUI CREEK California Scour Critical — Countermeasures Installed Poor 1956 11,000
SAN BENITO RIVER California Scour Critical — Countermeasures Installed Poor 1959 11,000
NOJOQUI CREEK California Scour Critical — Countermeasures Installed Poor 1956 11,000
SAINT HELENA CREEK California Scour Critical — Countermeasures Installed Good 1934 10,900
BEEHIVE DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
BEEHIVE DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
ARCO DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
SUTRO DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
ALTA DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
ESSO DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
OBAN DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
PALEN DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
COPA DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
AZTEC DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
ESSO DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
PALEN DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
AZTEC DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
META DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
ALTA DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
OBAN DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
META DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
WALLA DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
TARANTULA DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
MUD DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
RUBBLE DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700
MUD DITCH California Scour Critical — Countermeasures Installed Good 1966 10,700

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