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
SWALE CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1995	244
PIONEER CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1963	241
STILLWATER CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1962	239
SILVER CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1974	238
BRANCH SILVER CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1975	238
KETTLE RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1950	235
BLACK RIVER	Washington	Scour Critical — Countermeasures Installed	Good	1986	229
ANDERSON CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1965	226
PATIT CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1915	225
CARTER CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1963	219
SKIDMORE SLOUGH	Washington	Scour Critical — Countermeasures Installed	Fair	2010	218
Deep Creek	Washington	Scour Critical — Countermeasures Installed	Fair	1900	209
SILVER CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1974	201
S FK SNOQUALMIE RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1974	200
OLSEN CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	2018	200
SKAGIT RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1958	200
TUCANNON RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1965	200
TUCANNON RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1965	200
STORM BRANCH	Washington	Scour Critical — Countermeasures Installed	Good	1982	199
SAN POIL RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1931	193
HANAFORD CR.	Washington	Scour Critical — Countermeasures Installed	Fair	1955	189
CEDAR CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1971	187
BROOKS SLOUGH	Washington	Scour Critical — Countermeasures Installed	Fair	1959	187
LEWIS CREEK	Washington	Scour Critical — Countermeasures Installed	Good	2005	186
STILL CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1971	184
MARION DRAIN	Washington	Scour Critical — Countermeasures Installed	Good	1974	180
S.FORK CHEHALIS RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1970	174
ALKALI FLAT CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1940	174
DRY COULEE	Washington	Scour Critical — Countermeasures Installed	Good	1963	165
DRY COULEE	Washington	Scour Critical — Countermeasures Installed	Fair	1963	165
PORTER CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1936	162
BUNKER CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1963	159
NORTH OSTERMAN CK	Washington	Scour Critical — Countermeasures Installed	Good	2021	158
STILLMAN CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1995	157
TOUCHET RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1963	150
CLOQUALLUM CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1945	150
DRY CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1970	148
LAKE CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1960	148
MILL CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1995	143
TOPPENISH CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1948	140
ALKALI FLAT CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1977	136
ALKALI FLAT CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1981	136
TROUT CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1966	128
FALL RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1953	128
VANCE CREEK	Washington	Scour Critical — Countermeasures Installed	Poor	1971	124
THORN CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1964	121
BRANCH DRY CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1964	120
TOPPENISH CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1957	115
TROUT CREEK	Washington	Scour Critical — Countermeasures Installed	Poor	1957	110
CABBAGE CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1969	106

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