Scour Critical Bridges in Washington

516 bridges in Washington 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 516 bridges in Washington have been identified as vulnerable to scour damage.

Clear

Bridge	State	Scour Status	Condition	Year Built	ADT
COWLITZ RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1953	21,828
COWLITZ RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1953	21,828
WYNOOCHEE RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1935	21,466
PORT WASHINGTON NARROWS	Washington	Scour Critical — Countermeasures Installed	Fair	1958	21,462
NOOKSACK RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1950	21,350
SNAKE RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1939	21,000
COLUMBIA R @ LONGVIEW	Washington	Scour Critical — Countermeasures Installed	Fair	1929	20,432
SWAMP CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1935	18,981
YAKIMA RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1917	17,681
YAKIMA RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1962	17,681
KACHESS RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1958	17,108
CLE ELUM RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1949	17,089
CLE ELUM RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1962	17,089
YAKIMA RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1959	16,667
YAKIMA RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1959	16,667
STEAMBOAT SLOUGH	Washington	Scour Critical — Countermeasures Installed	Poor	1927	16,592
STEAMBOAT SLOUGH	Washington	Scour Critical — Countermeasures Installed	Fair	1954	16,592
SNOHOMISH R.	Washington	Scour Critical — Countermeasures Installed	Good	1983	16,383
SNOHOMISH RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1954	16,286
DRY CREEK	Washington	Scour Critical — Countermeasures Installed	Poor	1967	15,974
JOHNS CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1948	15,751
SNOHOMISH R & TESTER RD	Washington	Scour Critical — Countermeasures Installed	Fair	1963	15,631
HASKELL SLOUGH	Washington	Scour Critical — Countermeasures Installed	Fair	1957	15,411
SLOUGH & CNTY RD	Washington	Scour Critical — Countermeasures Installed	Fair	1947	15,105
JENKINS CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1929	15,015
SCATTER CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1926	13,337
KENNEDY CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1960	13,297
KENNEDY CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1960	13,297
SNAKE RIVER & BNRR	Washington	Scour Critical — Countermeasures Installed	Fair	1950	13,260
YAKIMA RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1932	13,121
POSSESSION SOUND	Washington	Scour Critical — Countermeasures Installed	Good	2020	13,078
NORTH CR & GILLMAN TRAIL	Washington	Scour Critical — Countermeasures Installed	Good	1967	12,517
NORTH CR & GILLMAN TRAIL	Washington	Scour Critical — Countermeasures Installed	Good	1960	12,517
DRAINAGE OVERFLOW	Washington	Scour Critical — Countermeasures Installed	Poor	1954	12,132
POSSESSION SOUND	Washington	Scour Critical — Countermeasures Installed	Fair	1987	12,000
NORTH CR & GILLMAN TRAIL	Washington	Scour Critical — Countermeasures Installed	Good	1968	11,919
HOLDER CR HOBART RD	Washington	Scour Critical — Countermeasures Installed	Good	1961	11,615
S FK SNOQUALMIE R	Washington	Scour Critical — Countermeasures Installed	Fair	1936	11,531
LACAMAS LAKE	Washington	Scour Critical — Countermeasures Installed	Poor	1930	11,155
SHERWOOD CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1952	10,739
E FK WILDCAT CR	Washington	Scour Critical — Countermeasures Installed	Good	1962	10,124
CLOQUALLUM CR	Washington	Scour Critical — Countermeasures Installed	Good	1962	10,124
CLOQUALLUM CR	Washington	Scour Critical — Countermeasures Installed	Good	1962	10,124
E FK WILDCAT CR	Washington	Scour Critical — Countermeasures Installed	Good	1962	10,124
LACAMAS CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1921	10,107
APPLE TREE COVE	Washington	Scour Critical — Countermeasures Installed	Fair	1986	10,000
WASHOUGAL RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1947	9,924
SNOQUALMIE RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1931	9,740
PUGET SOUND @ FAUNTLEROY	Washington	Scour Critical — Countermeasures Installed	Fair	1957	9,721
PUGET SOUND @ FAUNTLEROY	Washington	Scour Critical — Countermeasures Installed	Good	1984	9,721

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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