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
ASH SLOUGH	California	Scour Critical — Countermeasures Ineffective	Good	2024	1,000
TEMIESCAL WASH	California	Scour Critical — Countermeasures Ineffective	Good	2023	1,000
PLEASANT GROVE CREEK	California	Scour Critical — Countermeasures Ineffective	Good	1997	1,000
SUCKER RAVINE	California	Scour Critical — Countermeasures Ineffective	Fair	1987	1,000
TURNER CANYON CREEK	California	Scour Critical — Countermeasures Ineffective	Good	2024	150
TURNER CANYON CREEK	California	Scour Critical — Countermeasures Ineffective	Good	2024	150
LITTLE WOLF CREEK	California	Scour Critical — Countermeasures Ineffective	Good	2018	100
ROCK CREEK	California	Scour Critical — Countermeasures Ineffective	Good	2017	100
BLUE CREEK	California	Scour Critical — Countermeasures Ineffective	Fair	1981	50
SERRANO CREEK	California	Scour Critical — Countermeasures Ineffective	Good	2024	1
SLOUGH	California	Scour Critical — Countermeasures Ineffective	Poor	1945	—
SAN GABRIEL RIVER	California	Scour Critical — Countermeasures Installed	Fair	1964	255,000
RIO HONDO	California	Scour Critical — Countermeasures Installed	Fair	1966	224,000
SUISUN CREEK	California	Scour Critical — Countermeasures Installed	Poor	1932	202,000
AMERICAN RIVER	California	Scour Critical — Countermeasures Installed	Fair	1955	78,370
FEATHER RIVER K ST UP RR	California	Scour Critical — Countermeasures Installed	Fair	1947	48,000
NVRR NAPA RIVER STANLY	California	Scour Critical — Countermeasures Installed	Poor	1977	48,000
SAN GABRIEL RIVER	California	Scour Critical — Countermeasures Installed	Fair	1966	40,000
WHITEWATER RIVER	California	Scour Critical — Countermeasures Installed	Fair	1952	39,500
WHITEWATER RIVER	California	Scour Critical — Countermeasures Installed	Fair	1952	39,500
OLEARY CREEK	California	Scour Critical — Countermeasures Installed	Fair	1966	37,500
STEVENS CREEK	California	Scour Critical — Countermeasures Installed	Fair	1933	30,000
PERRIS VALLEY STORM DRN	California	Scour Critical — Countermeasures Installed	Good	1956	26,340
TECKA DITCH	California	Scour Critical — Countermeasures Installed	Fair	1967	23,100
BETA DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,100
KRUME DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,100
IROLO DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,100
KRUME DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,100
BETA DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,100
TECKA DITCH	California	Scour Critical — Countermeasures Installed	Fair	1967	23,100
ORRIS DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,100
DETERMINATION DITCH	California	Scour Critical — Countermeasures Installed	Fair	1967	23,000
DETERMINATION DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,000
AJAX DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,000
TARO DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,000
UNION DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,000
UNION DITCH	California	Scour Critical — Countermeasures Installed	Fair	1967	23,000
SHANTY DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,000
AJAX DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,000
ORRIS DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,000
TARO DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,000
BULA DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,000
BULA DITCH	California	Scour Critical — Countermeasures Installed	Good	1967	23,000
SHANTY DITCH	California	Scour Critical — Countermeasures Installed	Fair	1967	23,000
RTE 405 605 CONN RIV	California	Scour Critical — Countermeasures Installed	Fair	1966	22,800
W. LITTLE LLAGAS CREEK	California	Scour Critical — Countermeasures Installed	Good	1965	22,000
QUARTZ DITCH	California	Scour Critical — Countermeasures Installed	Good	1966	21,400
ROLLIE DITCH	California	Scour Critical — Countermeasures Installed	Good	1966	21,400
GHOST DITCH	California	Scour Critical — Countermeasures Installed	Good	1966	21,400
GHOST DITCH	California	Scour Critical — Countermeasures Installed	Good	1966	21,400

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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