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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
EAST DEER CR Washington Scour Critical — Countermeasures Installed Fair 1900 645
LAKE CR. Washington Scour Critical — Countermeasures Installed Fair 1960 642
SHEEP CREEK Washington Scour Critical — Countermeasures Installed Fair 1937 624
OLEQUA CREEK Washington Scour Critical — Countermeasures Installed Good 1972 621
MOX CHEHALIS CREEK Washington Scour Critical — Countermeasures Installed Fair 1964 605
MOX CHEHALIS CREEK Washington Scour Critical — Countermeasures Installed Fair 1965 573
SINCLAIR INLET Washington Scour Critical — Countermeasures Installed Fair 1961 560
CAMPBELL CREEK Washington Scour Critical — Countermeasures Installed Good 1960 541
CLOQUALLUM CREEK Washington Scour Critical — Countermeasures Installed Good 1985 527
BIG CREEK Washington Scour Critical — Countermeasures Installed Fair 1960 519
EDITH CREEK Washington Scour Critical — Countermeasures Installed Fair 1926 500
ASOTIN CREEK Washington Scour Critical — Countermeasures Installed Fair 1920 500
LITTLE WHITE SALMON RIVE Washington Scour Critical — Countermeasures Installed Fair 1957 476
ROCK CREEK Washington Scour Critical — Countermeasures Installed Fair 1971 475
STEARNS CREEK Washington Scour Critical — Countermeasures Installed Good 1975 474
DRY RUN Washington Scour Critical — Countermeasures Installed Fair 1947 472
WILDCAT CREEK Washington Scour Critical — Countermeasures Installed Good 1966 461
MASON CREEK Washington Scour Critical — Countermeasures Installed Fair 1959 446
STEVENS CREEK Washington Scour Critical — Countermeasures Installed Fair 1961 439
CAMP CREEK Washington Scour Critical — Countermeasures Installed Poor 1971 437
DRY CREEK Washington Scour Critical — Countermeasures Installed Fair 1921 429
SPRING VALLEY BRANCH Washington Scour Critical — Countermeasures Installed Good 1921 429
PILCHUCK RIVER Washington Scour Critical — Countermeasures Installed Fair 1924 421
MILL CREEK Washington Scour Critical — Countermeasures Installed Poor 1960 420
ELLIOTT BAY Washington Scour Critical — Countermeasures Installed Fair 1964 412
UNION FLAT CREEK Washington Scour Critical — Countermeasures Installed Good 1973 407
CLALLAM SLOUGH Washington Scour Critical — Countermeasures Installed Poor 1959 400
EVANS CREEK Washington Scour Critical — Countermeasures Installed Fair 1913 397
COWICHE CREEK Washington Scour Critical — Countermeasures Installed Fair 1950 393
CASE INLET Washington Scour Critical — Countermeasures Installed Fair 1920 385
MILL CREEK Washington Scour Critical — Countermeasures Installed Poor 1981 380
EAST FORK SATSOP RIVER Washington Scour Critical — Countermeasures Installed Good 1993 376
DRY GULCH Washington Scour Critical — Countermeasures Installed Fair 1952 366
ROUNDTOP CREEK Washington Scour Critical — Countermeasures Installed Good 1967 364
GRAYS RIVER Washington Scour Critical — Countermeasures Installed Good 1989 361
LITTLE BOULDER CR Washington Scour Critical — Countermeasures Installed Fair 1900 358
DRY CREEK Washington Scour Critical — Countermeasures Installed Fair 1977 347
S FORK SKYKOMISH RIVER Washington Scour Critical — Countermeasures Installed Fair 1957 343
UNION FLAT CREEK Washington Scour Critical — Countermeasures Installed Fair 1969 314
BLIND BAY Washington Scour Critical — Countermeasures Installed Fair 2004 308
OVERFLOW CHANNEL Washington Scour Critical — Countermeasures Installed Fair 1924 301
REBEL FLAT CREEK Washington Scour Critical — Countermeasures Installed Good 1964 300
PINE CREEK Washington Scour Critical — Countermeasures Installed Fair 1971 300
BLACK CREEK Washington Scour Critical — Countermeasures Installed Good 1958 290
S.FORK CHEHALIS RIVER Washington Scour Critical — Countermeasures Installed Fair 1955 284
N.FK. NEWAUKUM RIVER Washington Scour Critical — Countermeasures Installed Good 1962 274
SINKING CREEK Washington Scour Critical — Countermeasures Installed Poor 1950 267
LINCOLN CREEK Washington Scour Critical — Countermeasures Installed Fair 1977 266
COULEE CREEK Washington Scour Critical — Countermeasures Installed Fair 1923 266
ENTIAT RIVER Washington Scour Critical — Countermeasures Installed Poor 1957 246

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