Scour Critical Bridges in South Dakota

207 bridges in South Dakota 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 207 bridges in South Dakota have been identified as vulnerable to scour damage.

Clear

Bridge	State	Scour Status	Condition	Year Built	ADT
CHOTEAU CREEK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1955	564
REDSTONE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1978	557
PEASE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1954	553
VERMILLION RV	South Dakota	Scour Critical — Countermeasures Installed	Good	1968	550
WEST BR BULL CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1971	540
CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1955	502
FIRESTEEL CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1952	500
BOXELDER CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1974	500
SPLIT ROCK CREEK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1966	500
EMANUEL CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1966	492
NORTH BR TWELVE MILE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1958	481
BIG SIOUX RV	South Dakota	Scour Critical — Countermeasures Installed	Poor	1971	468
JAMES RV	South Dakota	Scour Critical — Countermeasures Installed	Good	1975	466
NORTH DEER CK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1925	462
JAMES RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1961	460
HAY CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1962	424
CK	South Dakota	Scour Critical — Countermeasures Installed	Good	1980	420
WEST UNION CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1969	406
HERMAPHRODITE CK	South Dakota	Scour Critical — Countermeasures Installed	Good	1981	405
CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1935	403
CHOTEAU CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1960	387
WILLOW CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1957	386
WHETSTONE RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1959	374
CK	South Dakota	Scour Critical — Countermeasures Installed	Good	1962	364
NORTH FORK GRAND RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1966	364
SPRING CREEK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1950	361
WOLF CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1957	361
MOREAU RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1964	356
BIG SLOUGH CK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1955	354
MARNE CREEK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1984	343
WILLOW CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1950	340
BIG SIOUX RIVER	South Dakota	Scour Critical — Countermeasures Installed	Fair	1964	324
EAST FORK VERMILLION RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1967	308
BLACK PIPE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1987	302
NORTH WOLF CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1966	301
VERMILLION RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1973	297
TURKEY RIDGE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1968	293
CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1968	293
MAPLE RIVER	South Dakota	Scour Critical — Countermeasures Installed	Fair	1981	267
COFFEE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1934	257
MEDICINE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1941	251
OKOBOJO CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1936	250
CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1956	244
TURTLE CREEK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1970	239
CROW CREEK DITCH	South Dakota	Scour Critical — Countermeasures Installed	Fair	1950	234
CAIN CREEK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1952	233
WEST ELM CK	South Dakota	Scour Critical — Countermeasures Installed	Good	1975	233
CK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1932	220
STRAY HORSE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1961	218
MOCCASIN CREEK	South Dakota	Scour Critical — Countermeasures Installed	Fair	2008	214

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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