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
WEST BR FIRESTEEL CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1959	1,284
CHOTEAU CK	South Dakota	Scour Critical — Countermeasures Installed	Good	1968	1,199
MOREAU RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1965	1,190
FOUR MILE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1965	1,190
EAST UNION CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1960	1,173
DRAINAGE DITCH	South Dakota	Scour Critical — Countermeasures Installed	Fair	1960	1,173
MAHONEY CK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1940	1,167
BR NORTH DEER CK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1925	1,163
BEAR CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1954	1,130
SPRING CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	1,073
SPRING CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	1,073
SPRING CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	1,073
LONG CREEK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1951	1,017
LONG CREEK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1951	1,017
BATTLE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1974	1,007
BATTLE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1974	1,007
BATTLE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1974	1,007
VERMILLION RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1968	1,004
ANTELOPE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1953	993
COTTONWOOD CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1955	980
SLIP-UP CREEK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1956	965
BR SMITH CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1957	949
CROW CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1960	949
HIDEWOOD CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1954	932
COBB CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1955	932
COBB CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1955	932
SOLDIER CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	917
STRAY HORSE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1957	917
CROW CK DITCH	South Dakota	Scour Critical — Countermeasures Installed	Fair	1961	836
DRAINAGE DITCH	South Dakota	Scour Critical — Countermeasures Installed	Fair	1983	776
EMANUEL CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1970	764
CROW CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1958	755
WOLF CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1937	749
BIG SIOUX RV	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	735
SIX MILE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1950	714
CHAPELLE CK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1949	691
SOUTH FORK SNAKE CK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1939	688
PARK CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1937	684
HORSEHEAD CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1963	673
CK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1940	672
JAMES RV	South Dakota	Scour Critical — Countermeasures Installed	Poor	1956	668
MITCHELL CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1960	650
OKOBOJO CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1972	632
PLUM CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1960	624
BIG SLOUGH CREEK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1953	620
TRIB. TO BIG SIOUX RIVER	South Dakota	Scour Critical — Countermeasures Installed	Fair	1925	614
LITTLE PRAIRIE DOG CK	South Dakota	Scour Critical — Countermeasures Installed	Good	1960	592
DUPREE CK	South Dakota	Scour Critical — Countermeasures Installed	Poor	1961	590
NORTH FORK SNAKE CK	South Dakota	Scour Critical — Countermeasures Installed	Fair	1959	578
CHEYENNE RV	South Dakota	Scour Critical — Countermeasures Installed	Poor	1962	567

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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