Scour Critical Bridges in Louisiana

1,302 bridges in Louisiana 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 1,302 bridges in Louisiana have been identified as vulnerable to scour damage.

Clear

Bridge	State	Scour Status	Condition	Year Built	ADT
BLACK LAKE CREEK	Louisiana	Scour Critical — Unaddressed	Fair	1964	37,514
BLACK LAKE CREEK	Louisiana	Scour Critical — Unaddressed	Fair	1964	37,514
ATCHAF.R/BERWICK BAY	Louisiana	Scour Critical — Unaddressed	Poor	1933	12,788
WHITE BAYOU	Louisiana	Scour Critical — Unaddressed	Poor	1951	11,198
WAX LAKE OUTLET	Louisiana	Scour Critical — Unaddressed	Poor	1975	10,035
BIG BRANCH	Louisiana	Scour Critical — Unaddressed	Fair	1932	9,941
LIT NATALBANY R.	Louisiana	Scour Critical — Unaddressed	Good	1950	8,928
BOGUE LUSA CREEK	Louisiana	Scour Critical — Unaddressed	Fair	1950	5,213
PASS MANCHAC	Louisiana	Scour Critical — Unaddressed	Poor	1957	4,107
THOMPSON CREEK	Louisiana	Scour Critical — Unaddressed	Fair	1959	3,675
Bayou Carencro	Louisiana	Scour Critical — Unaddressed	Fair	1979	2,067
CHEF MENTEUR PASS	Louisiana	Scour Critical — Unaddressed	Poor	1930	1,215
BOGUE CHITTO R.	Louisiana	Scour Critical — Unaddressed	Fair	1979	610
BIG CREEK	Louisiana	Scour Critical — Countermeasures Ineffective	Good	1996	511
WEST COLYELL CR	Louisiana	Scour Critical — Countermeasures Installed	Fair	1970	77,469
BIG BRANCH	Louisiana	Scour Critical — Countermeasures Installed	Fair	1969	75,867
BLOOD RIVER	Louisiana	Scour Critical — Countermeasures Installed	Fair	1968	74,180
CITY STREETS	Louisiana	Scour Critical — Countermeasures Installed	Fair	1970	64,059
YELLOW WATER RIVER REL.	Louisiana	Scour Critical — Countermeasures Installed	Good	1970	58,377
SELSERS CREEK	Louisiana	Scour Critical — Countermeasures Installed	Fair	1975	53,386
ABITA RIVER	Louisiana	Scour Critical — Countermeasures Installed	Fair	1975	45,574
BLOOD RIVER	Louisiana	Scour Critical — Countermeasures Installed	Fair	1968	44,252
BIG BRANCH	Louisiana	Scour Critical — Countermeasures Installed	Good	1969	44,252
COOLEY BRANCH	Louisiana	Scour Critical — Countermeasures Installed	Good	1960	44,225
COOLEY BRANCH	Louisiana	Scour Critical — Countermeasures Installed	Fair	1960	44,225
PONCHATOULA CR.	Louisiana	Scour Critical — Countermeasures Installed	Good	1960	39,850
PASS MANCHAC	Louisiana	Scour Critical — Countermeasures Installed	Fair	1977	39,850
DORCHEAT BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1960	38,625
CROWS CR RELIEF	Louisiana	Scour Critical — Countermeasures Installed	Poor	1960	37,514
CROWS CR RELIEF	Louisiana	Scour Critical — Countermeasures Installed	Fair	1960	37,514
WEST COLYELL CR	Louisiana	Scour Critical — Countermeasures Installed	Fair	1970	37,161
NATALBANY RIVER	Louisiana	Scour Critical — Countermeasures Installed	Fair	1970	37,140
DRY BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1962	36,841
INDIAN BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1962	36,841
CLEAR BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1962	36,841
YELLOW BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1962	36,841
COULEE MINE	Louisiana	Scour Critical — Countermeasures Installed	Fair	1967	34,877
WEST COLYELL CR	Louisiana	Scour Critical — Countermeasures Installed	Good	1962	34,245
MIDDLE SLOUGH	Louisiana	Scour Critical — Countermeasures Installed	Fair	1962	33,925
CLEAR BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1962	33,925
DRY BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1962	33,925
YELLOW BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1962	33,925
INDIAN BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1962	33,925
DORCHEAR BAYOU REL	Louisiana	Scour Critical — Countermeasures Installed	Fair	1992	32,869
DORCHEAT BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1992	32,869
CITY STREETS	Louisiana	Scour Critical — Countermeasures Installed	Fair	1969	32,092
WARDS CREEK	Louisiana	Scour Critical — Countermeasures Installed	Fair	1967	32,092
RAMBIN BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1986	28,142
JONHSON CHUTE BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1985	28,142
DAWSON CR.BRG.(ACADIAN)	Louisiana	Scour Critical — Countermeasures Installed	Fair	1964	22,447

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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