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
MCAIN CREEK	Louisiana	Scour Critical — Countermeasures Installed	Fair	1993	21,933
PONCHATOULA CR.	Louisiana	Scour Critical — Countermeasures Installed	Good	1960	21,736
DAWSON CREEK/BLUEBONNET	Louisiana	Scour Critical — Countermeasures Installed	Fair	1978	21,296
DAWSON CREEK/BLUEBONNET	Louisiana	Scour Critical — Countermeasures Installed	Fair	1978	21,296
PONCHATOULA CREEK C	Louisiana	Scour Critical — Countermeasures Installed	Fair	1975	21,045
FLAGON BAYOU RELIEF	Louisiana	Scour Critical — Countermeasures Installed	Good	1984	20,902
DIVERSION CANAL	Louisiana	Scour Critical — Countermeasures Installed	Good	1989	20,572
BRUSH BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1977	19,314
VERMILION RIVER	Louisiana	Scour Critical — Countermeasures Installed	Fair	1954	18,293
OUACHITA RIVER-LOUISVILL	Louisiana	Scour Critical — Countermeasures Installed	Fair	1936	17,683
SELSERS CREEK	Louisiana	Scour Critical — Countermeasures Installed	Fair	1975	17,665
GREYS CREEK	Louisiana	Scour Critical — Countermeasures Installed	Good	1956	17,500
CROSS BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Poor	1960	16,911
BRUSH BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1984	16,911
SOUTH BRUSH BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1986	16,911
CARENCRO BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1948	16,573
TCHEFUNCTE R/MADISONVILL	Louisiana	Scour Critical — Countermeasures Installed	Fair	1980	16,517
CROSS BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Good	1983	15,302
ABITA RIVER	Louisiana	Scour Critical — Countermeasures Installed	Good	1975	14,668
PASS MANCHAC	Louisiana	Scour Critical — Countermeasures Installed	Fair	1977	14,300
CHINCHUBA BRANCH	Louisiana	Scour Critical — Countermeasures Installed	Fair	1972	14,110
ABITA RIVER	Louisiana	Scour Critical — Countermeasures Installed	Fair	1972	14,110
CROSS BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Poor	1960	14,003
SELSERS CREEK	Louisiana	Scour Critical — Countermeasures Installed	Fair	1938	12,900
DRAINAGE CANAL	Louisiana	Scour Critical — Countermeasures Installed	Fair	2011	12,186
BOGUE CHITTO RELIEF	Louisiana	Scour Critical — Countermeasures Installed	Good	1996	12,018
BOGUE CHITTO RIVER	Louisiana	Scour Critical — Countermeasures Installed	Good	1997	12,018
DIVERSION CANAL	Louisiana	Scour Critical — Countermeasures Installed	Good	1989	11,969
WAFER CREEK	Louisiana	Scour Critical — Countermeasures Installed	Fair	1954	11,636
MILL CREEK	Louisiana	Scour Critical — Countermeasures Installed	Fair	1954	11,636
CYPRESS CREEK	Louisiana	Scour Critical — Countermeasures Installed	Poor	1961	11,636
WEST COLYELL CR.	Louisiana	Scour Critical — Countermeasures Installed	Fair	1932	11,488
BAYOU MANCHAC	Louisiana	Scour Critical — Countermeasures Installed	Poor	1972	11,384
CROSS BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1990	11,190
BAYOU JOE MORCEL	Louisiana	Scour Critical — Countermeasures Installed	Good	1994	11,126
CROSS BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1960	10,312
AMITE RIVER	Louisiana	Scour Critical — Countermeasures Installed	Good	2009	10,200
WILLIS BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Fair	1982	10,070
CROWS CREEK	Louisiana	Scour Critical — Countermeasures Installed	Fair	1979	9,942
MID COLYELL CR.	Louisiana	Scour Critical — Countermeasures Installed	Fair	1932	9,745
LAKE VILLAR	Louisiana	Scour Critical — Countermeasures Installed	Fair	1983	9,608
BLACK BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Poor	1983	9,608
BOGUE FALAYA	Louisiana	Scour Critical — Countermeasures Installed	Fair	1993	9,408
GRAYS CREEK	Louisiana	Scour Critical — Countermeasures Installed	Fair	1956	9,267
BAYOU DORCHEAT	Louisiana	Scour Critical — Countermeasures Installed	Poor	1954	9,109
HUBS BAYOU	Louisiana	Scour Critical — Countermeasures Installed	Poor	1972	9,104
DRAIN	Louisiana	Scour Critical — Countermeasures Installed	Fair	1954	9,053
CHENIERE CREEK	Louisiana	Scour Critical — Countermeasures Installed	Poor	1970	8,694
FLAT RIVER	Louisiana	Scour Critical — Countermeasures Installed	Fair	1982	8,332
OUACHITA RIVER	Louisiana	Scour Critical — Countermeasures Installed	Fair	2003	8,312

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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