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
FOUR MILE CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1980	103
SALMON CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1977	103
FOUR MILE CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1976	102
PESHASTIN CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1979	100
TOUCHET RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1914	100
PATIT CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1915	100
EIGHT CR.	Washington	Scour Critical — Countermeasures Installed	Good	1983	95
STILLWATER CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1960	95
KETTLE RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1995	94
DRAGOON CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1986	92
RAINEY CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1965	83
SWALE CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1995	83
SKYKOMISH RIVER-S FORK	Washington	Scour Critical — Countermeasures Installed	Poor	1930	80
GREENWATER RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1973	80
CABBAGE CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1973	79
DEEP CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1987	77
CHAMOKANE CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1974	75
SALMON CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1980	74
DEEP CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1978	66
PUGET SND @ PT TOWNSEND	Washington	Scour Critical — Countermeasures Installed	Poor	1955	63
SOUTH FORK PALOUSE RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1975	62
PLEASANT VALLEY CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1921	60
MILL CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1974	58
SQUAW CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1979	57
CHAMOKANE CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1975	57
SO FORK NASELLE RIVER	Washington	Scour Critical — Countermeasures Installed	Good	1996	56
DEEP CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1978	55
FOUR MILE CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1975	55
LITTLE PEND OREILLE RIVE	Washington	Scour Critical — Countermeasures Installed	Fair	1975	47
LAVA CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1965	46
LUCAS CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1966	45
SOUTH FORK DEEP CREEK	Washington	Scour Critical — Countermeasures Installed	Poor	1955	40
COTTONWOOD CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1981	40
MAD RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	2001	40
LITTLE PEND OREILLE RIVE	Washington	Scour Critical — Countermeasures Installed	Fair	1960	35
LITTLE WHITE SALMON RVR.	Washington	Scour Critical — Countermeasures Installed	Good	1973	33
S.F. SAUK RIVER	Washington	Scour Critical — Countermeasures Installed	Fair	1977	31
MILL CREEK	Washington	Scour Critical — Countermeasures Installed	Good	1974	28
CLALLAM RIVER	Washington	Scour Critical — Countermeasures Installed	Poor	1969	27
PINE CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1971	26
THORN CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1963	25
UNION FLAT CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1973	25
ROBINSON FORK	Washington	Scour Critical — Countermeasures Installed	Good	1998	25
DELEZENNE CREEK	Washington	Scour Critical — Countermeasures Installed	Poor	1972	24
Little Skookum Creek	Washington	Scour Critical — Countermeasures Installed	Good	2004	22
West Canal	Washington	Scour Critical — Countermeasures Installed	Fair	2004	20
SALMON CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1960	20
OCONNER CREEK	Washington	Scour Critical — Countermeasures Installed	Good	2018	20
GALLOP CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1952	18
WILLIAMS CREEK	Washington	Scour Critical — Countermeasures Installed	Fair	1962	18

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