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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
FRENCH GULCH California Scour Critical — Countermeasures Installed Fair 1922 742
TISDALE RD TISDALE BYPS California Scour Critical — Countermeasures Installed Poor 1964 737
ROCK CREEK TRIBUTARY California Scour Critical — Countermeasures Installed Poor 1918 716
MAIN DRAINAGE CANAL California Scour Critical — Countermeasures Installed Fair 1934 715
MISSION CREEK California Scour Critical — Countermeasures Installed Poor 1982 700
PIRU CREEK California Scour Critical — Countermeasures Installed Good 1983 700
SALT CREEK California Scour Critical — Countermeasures Installed Good 1947 670
RAMAJAL CREEK California Scour Critical — Countermeasures Installed Fair 1951 669
MARBLE FORK KAWEAH RIVER California Scour Critical — Countermeasures Installed Fair 1930 662
KLAMATH RIVER California Scour Critical — Countermeasures Installed Fair 1953 650
HILLSIDE California Scour Critical — Countermeasures Installed Fair 1965 650
FUNKS CREEK California Scour Critical — Countermeasures Installed Good 1927 642
TEMPLE CREEK S BRANCH California Scour Critical — Countermeasures Installed Fair 1927 641
POSO CREEK California Scour Critical — Countermeasures Installed Poor 1966 640
MCCARTY CREEK California Scour Critical — Countermeasures Installed Good 1951 600
DRY CREEK California Scour Critical — Countermeasures Installed Fair 1925 600
FOWLER SWITCH CANAL California Scour Critical — Countermeasures Installed Fair 1936 600
CARPINTERIA CREEK California Scour Critical — Countermeasures Installed Fair 1973 600
GUNNING CREEK California Scour Critical — Countermeasures Installed Fair 1981 546
SOUTH FORK ANTELOPE CRK California Scour Critical — Countermeasures Installed Poor 1929 500
ARROYO MOCHO California Scour Critical — Countermeasures Installed Fair 1988 500
BIG CREEK California Scour Critical — Countermeasures Installed Poor 1950 500
LOMPICO CREEK California Scour Critical — Countermeasures Installed Poor 1940 500
SHINGLE MILL GULCH California Scour Critical — Countermeasures Installed Poor 1950 500
GREEN VALLEY CREEK California Scour Critical — Countermeasures Installed Fair 1938 500
GREEN VALLEY CREEK California Scour Critical — Countermeasures Installed Good 1941 500
SAN LORENZO RIVER California Scour Critical — Countermeasures Installed Poor 1931 500
FOWLER SWITCH CANAL California Scour Critical — Countermeasures Installed Fair 1927 500
WILSON CREEK California Scour Critical — Countermeasures Installed Good 1950 491
SOUTH FORK COTTONWOOD CR California Scour Critical — Countermeasures Installed Good 1969 470
LAKELAND CANAL California Scour Critical — Countermeasures Installed Fair 1945 470
ROCK CREEK California Scour Critical — Countermeasures Installed Fair 1937 463
STONE CORRAL CREEK California Scour Critical — Countermeasures Installed Fair 1929 459
BLOSSOM WASH California Scour Critical — Countermeasures Installed Fair 1968 450
UNNAMED SLOUGH California Scour Critical — Countermeasures Installed Fair 1930 450
MURPHY SLOUGH California Scour Critical — Countermeasures Installed Fair 1964 450
FLEENER CREEK California Scour Critical — Countermeasures Installed Fair 1952 444
HAUPT CREEK California Scour Critical — Countermeasures Installed Fair 1917 409
WINDSOR CREEK California Scour Critical — Countermeasures Installed Fair 1976 400
SAN ANSELMO CREEK California Scour Critical — Countermeasures Installed Fair 1930 400
SAN LORENZO RIVER California Scour Critical — Countermeasures Installed Fair 1950 400
SAN LORENZO RIVER California Scour Critical — Countermeasures Installed Poor 1948 400
FOWLER SWITCH CANAL California Scour Critical — Countermeasures Installed Fair 1940 400
SHASTA RIVER California Scour Critical — Countermeasures Installed Good 1969 395
GLENN-COLUSA CANAL California Scour Critical — Countermeasures Installed Fair 1940 381
LONE TREE CREEK California Scour Critical — Countermeasures Installed Fair 1926 380
MUD CREEK California Scour Critical — Countermeasures Installed Good 1930 375
TROUT CREEK California Scour Critical — Countermeasures Installed Poor 1969 371
FRANZ CREEK California Scour Critical — Countermeasures Installed Poor 1946 350
LONE TREE CREEK California Scour Critical — Countermeasures Installed Good 1918 350

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