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
INDIAN CR	Washington	Scour Critical — Countermeasures Installed	Fair	1927	3,200
PUGET SOUND @ EAGLE HRBR	Washington	Scour Critical — Countermeasures Installed	Fair	2006	3,052
BEAVER CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1970	3,040
DUCKABUSH RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1934	2,967
DEEP CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1958	2,901
MASHEL RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1937	2,900
NISQUALLY R OVERFLOW	Washington	Scour Critical — Countermeasures Installed	Good	1945	2,872
NASELLE R	Washington	Scour Critical — Countermeasures Installed	Good	1953	2,839
LITTLE QUILCENE RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1938	2,792
SCATTER CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1965	2,751
COWLITZ RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1948	2,712
DAVIS CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1957	2,712
COWLITZ R OVERFLOW	Washington	Scour Critical — Countermeasures Installed	Good	1958	2,712
YAKIMA RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1947	2,678
FULTON CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1926	2,667
LAKE CR	Washington	Scour Critical — Countermeasures Installed	Fair	1963	2,666
TWENTYTWO CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1952	2,662
JOHNSON CR	Washington	Scour Critical — Countermeasures Installed	Fair	1962	2,655
PUGET SOUND	Washington	Scour Critical — Countermeasures Installed	Fair	1993	2,635
BERG SLOUGH	Washington	Scour Critical — Countermeasures Installed	Poor	1964	2,622
FRIDAY HBR-SAN JUAN CHAN	Washington	Scour Critical — Countermeasures Installed	Good	2005	2,587
JONES CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1931	2,524
CHELATCHIE CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1954	2,508
COAL CREEK	Washington	Scour Critical — Countermeasures Installed	Poor	1930	2,494
ROCKY CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1947	2,492
LITTLE SPOKANE RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1961	2,456
COPALIS RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1972	2,446
TILTON RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1931	2,351
NORTH FORK ISSAQUAH CRK	Washington	Scour Critical — Countermeasures Installed	Fair	1973	2,350
PUGET SOUND	Washington	Scour Critical — Countermeasures Installed	Fair	1994	2,330
LITTLE SPOKANE RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1953	2,306
WEST FORK WILDCAT CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1921	2,267
DRAIN	Washington	Scour Critical — Countermeasures Installed	Fair	1946	2,250
COPPER CR	Washington	Scour Critical — Countermeasures Installed	Fair	1922	2,249
HUMPTULIPS OVERFLOW	Washington	Scour Critical — Countermeasures Installed	Fair	1950	2,244
NEWMAN CREEK	Washington	Scour Critical — Countermeasures Installed	Poor	1922	2,194
HARNEY CHANNEL	Washington	Scour Critical — Countermeasures Installed	Fair	1979	2,150
TOPPENISH CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1954	2,146
PILCHUCK RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1978	2,124
GOLDSBOROUGH CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1956	2,079
COOK CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1936	1,999
WILKESON CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1918	1,964
N FK NOOKSACK R WARNICK	Washington	Scour Critical — Countermeasures Installed	Fair	1931	1,951
INDIAN CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1939	1,944
CHEHALIS RIVER OVERFLOW	Washington	Scour Critical — Countermeasures Installed	Fair	1993	1,941
CHEHALIS RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1969	1,941
BLACK CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1952	1,932
DIOBSUD CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1950	1,930
GREENWATER RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1932	1,907
SLIPPERY CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1967	1,907

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.

All Bridges Poor Condition Historic Bridges Bridge Stats