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
COXCOMB DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	21,400
ROLLIE DITCH	California	Scour Critical — Countermeasures Installed	Good	1966	21,400
QUARTZ DITCH	California	Scour Critical — Countermeasures Installed	Good	1966	21,400
COXCOMB DITCH	California	Scour Critical — Countermeasures Installed	Good	1966	21,400
MISSION CHANNEL OVERFLOW	California	Scour Critical — Countermeasures Installed	Fair	1966	20,910
MALIBU CRK	California	Scour Critical — Countermeasures Installed	Poor	1953	20,753
SAN ANTONIO CREEK	California	Scour Critical — Countermeasures Installed	Poor	1936	20,500
FORSYTHE CREEK	California	Scour Critical — Countermeasures Installed	Fair	1949	20,200
DRY CREEK CANAL	California	Scour Critical — Countermeasures Installed	Fair	1954	19,941
BLOSSOM WASH	California	Scour Critical — Countermeasures Installed	Fair	1968	19,500
BLOOM WASH	California	Scour Critical — Countermeasures Installed	Fair	1968	19,500
AIRPORT WASH	California	Scour Critical — Countermeasures Installed	Good	1968	19,500
GAS LINE WASH	California	Scour Critical — Countermeasures Installed	Fair	1968	19,500
BLOSSOM WASH	California	Scour Critical — Countermeasures Installed	Fair	1968	19,500
GAS LINE WASH	California	Scour Critical — Countermeasures Installed	Good	1968	19,500
LAVA WASH	California	Scour Critical — Countermeasures Installed	Good	1968	19,500
LAVA WASH	California	Scour Critical — Countermeasures Installed	Good	1968	19,500
AIRPORT WASH	California	Scour Critical — Countermeasures Installed	Good	1968	19,500
BLOOM WASH	California	Scour Critical — Countermeasures Installed	Fair	1968	19,500
POTRERO CREEK	California	Scour Critical — Countermeasures Installed	Fair	1926	19,252
ARROYO DEL VALLE	California	Scour Critical — Countermeasures Installed	Poor	1940	19,250
IVANPAH DITCH	California	Scour Critical — Countermeasures Installed	Good	1963	19,000
CLARK MOUNTAIN DITCH	California	Scour Critical — Countermeasures Installed	Good	1963	18,500
MESCAL DITCH	California	Scour Critical — Countermeasures Installed	Good	1963	18,500
MICRO DITCH	California	Scour Critical — Countermeasures Installed	Fair	1962	18,500
MESCAL DITCH	California	Scour Critical — Countermeasures Installed	Good	1963	18,500
MOHAWK DITCH	California	Scour Critical — Countermeasures Installed	Good	1963	18,500
WHEATON WASH	California	Scour Critical — Countermeasures Installed	Poor	1963	18,500
CLARK MOUNTAIN DITCH	California	Scour Critical — Countermeasures Installed	Good	1963	18,500
DRY CREEK	California	Scour Critical — Countermeasures Installed	Good	1928	18,000
SANTA ANA RIVER	California	Scour Critical — Countermeasures Installed	Fair	1953	17,821
TUOLUMNE RIVER	California	Scour Critical — Countermeasures Installed	Fair	1916	16,815
MARK WEST CREEK	California	Scour Critical — Countermeasures Installed	Fair	1956	16,600
BADGER WASH	California	Scour Critical — Countermeasures Installed	Fair	1972	16,500
STEVENS CREEK	California	Scour Critical — Countermeasures Installed	Fair	1922	15,041
NAPA RIVER	California	Scour Critical — Countermeasures Installed	Fair	1960	14,755
PILARCITOS CREEK	California	Scour Critical — Countermeasures Installed	Fair	1954	14,750
PILARCITOS CREEK	California	Scour Critical — Countermeasures Installed	Good	1954	14,750
TEMESCAL WASH	California	Scour Critical — Countermeasures Installed	Fair	1983	14,721
ULATIS CREEK	California	Scour Critical — Countermeasures Installed	Fair	1970	14,480
SAN DIEGUITO RIVER	California	Scour Critical — Countermeasures Installed	Poor	1932	14,027
SAN ANSELMO CREEK	California	Scour Critical — Countermeasures Installed	Fair	1940	14,000
CHUCKWALLA WASH	California	Scour Critical — Countermeasures Installed	Fair	2007	13,600
CHUCKWALLA WASH	California	Scour Critical — Countermeasures Installed	Fair	2007	13,600
HOMER WASH	California	Scour Critical — Countermeasures Installed	Fair	1971	13,600
CRESTVIEW WASH	California	Scour Critical — Countermeasures Installed	Fair	1971	13,600
HOMER WASH	California	Scour Critical — Countermeasures Installed	Fair	1971	13,600
ALAMO PINTADO CREEK	California	Scour Critical — Countermeasures Installed	Fair	1954	13,500
ARROYO DE LA LAGUNA	California	Scour Critical — Countermeasures Installed	Good	1939	13,500
SAN JOAQUIN RIVER	California	Scour Critical — Countermeasures Installed	Fair	1959	12,585

Scour Critical Rating Codes

Code 2 — Unaddressed	Bridge is scour critical with no countermeasures installed. The foundation is vulnerable and no protective action has been taken.
Code 3 — Countermeasures Installed	Protective measures (riprap, sheet piling, etc.) have been installed to reduce scour risk, but the bridge remains classified as scour critical.
Code 6 — Countermeasures Ineffective	Protective 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.

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