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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
CLIFTON BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1953 5,350
BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1953 5,350
WINN CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1967 5,328
BAYOU DES CANNES Louisiana Scour Critical — Countermeasures Installed Fair 1967 5,328
BEAR CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1963 5,228
BAYOU SAN MIGUEL Louisiana Scour Critical — Countermeasures Installed Good 2002 5,192
BILLS BRANCH Louisiana Scour Critical — Countermeasures Installed Fair 1977 5,160
SIMALOUSA CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1976 5,160
MILL CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1977 5,102
Mill Creek Louisiana Scour Critical — Countermeasures Installed Good 1976 5,102
FOURMILE BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1953 5,051
NAT. RIVER RELIEF Louisiana Scour Critical — Countermeasures Installed Fair 1963 5,026
PONCHATOULA CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1979 5,026
NATALBANY RIVER Louisiana Scour Critical — Countermeasures Installed Fair 1963 5,026
L NATALBANY RIVER Louisiana Scour Critical — Countermeasures Installed Fair 1962 5,026
MILL CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1973 5,013
COON BRANCH Louisiana Scour Critical — Countermeasures Installed Fair 1992 4,942
HORSE BAYOU Louisiana Scour Critical — Countermeasures Installed Poor 1971 4,905
MACKS BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1970 4,896
BAYOU SAN PATRICIO Louisiana Scour Critical — Countermeasures Installed Good 2006 4,790
BAYOU SAN MIGUEL Louisiana Scour Critical — Countermeasures Installed Fair 1963 4,790
MIDDLE RELIEF Louisiana Scour Critical — Countermeasures Installed Fair 1963 4,790
SWEETWATER CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1970 4,748
DAVIS BRANCH Louisiana Scour Critical — Countermeasures Installed Good 1981 4,748
DRAIN Louisiana Scour Critical — Countermeasures Installed Good 1982 4,748
TANGIPAHOA RIVER Louisiana Scour Critical — Countermeasures Installed Fair 1965 4,748
DRAUGHAN CREEK Louisiana Scour Critical — Countermeasures Installed Poor 1960 4,745
CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1960 4,719
DRAIN Louisiana Scour Critical — Countermeasures Installed Fair 1968 4,643
LONG BRANCH BAYOU Louisiana Scour Critical — Countermeasures Installed Poor 1954 4,612
LONG BRANCH BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1954 4,612
BLACK BAYOU Louisiana Scour Critical — Countermeasures Installed Poor 1967 4,595
LITTLE CANEY BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1978 4,595
COCKERHAM CREEK Louisiana Scour Critical — Countermeasures Installed Good 2008 4,538
LITTLE RIVER RELIEF Louisiana Scour Critical — Countermeasures Installed Fair 2008 4,538
LITTLE RIVER Louisiana Scour Critical — Countermeasures Installed Good 2008 4,538
CANAL Louisiana Scour Critical — Countermeasures Installed Fair 1973 4,534
BAYOU CLEAR Louisiana Scour Critical — Countermeasures Installed Fair 1989 4,368
DUGDEMONA RIVER RELIEF Louisiana Scour Critical — Countermeasures Installed Good 1996 4,317
BOGGY BAYOU Louisiana Scour Critical — Countermeasures Installed Poor 1969 4,294
BUCHANAN BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1969 4,294
CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1969 4,294
BOGGY BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1969 4,294
BAYOU GRAND CANE Louisiana Scour Critical — Countermeasures Installed Fair 1951 4,251
B.GRAND CANE RLF Louisiana Scour Critical — Countermeasures Installed Fair 1951 4,251
DRAIN Louisiana Scour Critical — Countermeasures Installed Fair 1951 4,251
BAYOU MARIA Louisiana Scour Critical — Countermeasures Installed Good 2011 4,200
ABITA RIVER Louisiana Scour Critical — Countermeasures Installed Fair 1983 4,200
MARIA BAYOU TRIB. #3 Louisiana Scour Critical — Countermeasures Installed Good 2011 4,200
CREEK Louisiana Scour Critical — Countermeasures Installed Good 2010 4,167

Scour Critical Rating Codes

Code 2 — UnaddressedBridge is scour critical with no countermeasures installed. The foundation is vulnerable and no protective action has been taken.
Code 3 — Countermeasures InstalledProtective measures (riprap, sheet piling, etc.) have been installed to reduce scour risk, but the bridge remains classified as scour critical.
Code 6 — Countermeasures IneffectiveProtective 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.

All Bridges Poor Condition Historic Bridges Bridge Stats