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
JAMES RIVER	South Dakota	Scour Critical — Unaddressed	Fair	1952	2,250
SAND CREEK	South Dakota	Scour Critical — Unaddressed	Fair	1900	156
MIDDLE PEARL CREEK	South Dakota	Scour Critical — Unaddressed	Poor	1928	56
WOUNDED KNEE CREEK	South Dakota	Scour Critical — Countermeasures Ineffective	Good	2007	600
MEADE ST. DRAINAGE	South Dakota	Scour Critical — Countermeasures Installed	Good	1964	15,500
CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1961	8,815
CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1961	8,815
LONE ROCK CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1959	7,955
LONE ROCK CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1959	7,955
BAD RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1956	6,040
SPRING CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	4,913
SPRING CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	4,913
SPLIT ROCK CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	4,101
SKUNK CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1986	4,068
BULL CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1964	4,065
BULL CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1964	4,065
JAMES RV	South Dakota	Scour Critical — Countermeasures Installed	Poor	1960	3,601
BEAVER CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	3,042
NINE MILE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	3,042
ELM RV	South Dakota	Scour Critical — Countermeasures Installed	Poor	1959	3,041
CAIN CREEK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1935	2,600
DEER CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1967	2,585
BIG SIOUX RIVER	South Dakota	Scour Critical — Countermeasures Installed	Fair	1939	2,500
JAMES RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1988	2,445
CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1988	2,420
BIG SIOUX RIVER	South Dakota	Scour Critical — Countermeasures Installed	Poor	1966	2,419
WEST FORK VERMILLION RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1976	2,416
SNAKE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1978	2,141
PIPESTONE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	1,968
SOUTH MEDICINE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1951	1,914
LAKE NORDEN OUTLET	South Dakota	Scour Critical — Countermeasures Installed	Fair	1949	1,862
BIG SIOUX RIVER	South Dakota	Scour Critical — Countermeasures Installed	Fair	1977	1,831
EAST FORK VERMILLION RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1947	1,768
BELLE FOURCHE RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1985	1,670
PONY CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1959	1,657
PONY CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1959	1,657
JAMES RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1962	1,651
NORTH BR DRY CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1964	1,651
WOLF CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1962	1,651
EAST FORK VERMILLION RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1989	1,648
DRY RUN CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1955	1,578
GRACE COOLIDGE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1977	1,562
CROW CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1966	1,543
ANDES CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1957	1,516
CROW CK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1940	1,500
CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1982	1,425
SLIP-UP CREEK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1970	1,381
BIG SIOUX RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1951	1,371
BUFFALO CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1964	1,330
SLIM BUTTE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1953	1,294

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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