Scour Critical Bridges

23,522 bridges across the US 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 23,522 bridges have been identified as vulnerable to scour damage.

Bridge State Scour Status Condition Year Built ADT
NEDDY CREEK Texas Scour Critical — Countermeasures Ineffective Good 2009 70
Ouachita River Polk Co. Arkansas Scour Critical — Countermeasures Ineffective Good 1983 70
MIDDLE CREEK West Virginia Scour Critical — Countermeasures Ineffective Poor 1979 70
MAIN DITCH Arkansas Scour Critical — Countermeasures Ineffective Fair 2001 70
BUFFALO BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 2011 70
CLEAR CREEK DRAW Texas Scour Critical — Countermeasures Ineffective Fair 2004 70
CLEAR CREEK Texas Scour Critical — Countermeasures Ineffective Good 2002 69
Tanner Creek - Wash Co Arkansas Scour Critical — Countermeasures Ineffective Good 2024 69
BLAINS CREEK Texas Scour Critical — Countermeasures Ineffective Good 2014 69
CASTLEMAN CREEK Texas Scour Critical — Countermeasures Ineffective Good 1996 68
PARADISE CREEK Texas Scour Critical — Countermeasures Ineffective Good 2005 67
GILBERT CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1962 67
HONEY CREEK Texas Scour Critical — Countermeasures Ineffective Good 2024 66
BRANCH BRUSHY CREEK Texas Scour Critical — Countermeasures Ineffective Good 2007 66
S FK JUDITH RIVER Montana Scour Critical — Countermeasures Ineffective Poor 1958 65
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1972 65
FISH CREEK Texas Scour Critical — Countermeasures Ineffective Good 1976 65
POND CREEK Texas Scour Critical — Countermeasures Ineffective Good 2009 64
SOUTH FISH CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1982 64
GAGES CREEK Texas Scour Critical — Countermeasures Ineffective Good 2008 64
COLEY CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1986 64
EAST FORK POND CREEK Texas Scour Critical — Countermeasures Ineffective Good 1996 63
SAND CREEK Utah Scour Critical — Countermeasures Ineffective Fair 2024 63
BRANCH BRUSHY CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1977 62
LEON RIVER Texas Scour Critical — Countermeasures Ineffective Good 2007 62
N FORK CHAMBERS CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1991 62
RIO GRANDE RIVER Texas Scour Critical — Countermeasures Ineffective Fair 1956 62
COWSKIN CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1977 62
HUFFSTUTTLE CREEK Texas Scour Critical — Countermeasures Ineffective Good 1958 61
ELM CREEK Texas Scour Critical — Countermeasures Ineffective Good 1998 61
IRRIGATION DITCH Texas Scour Critical — Countermeasures Ineffective Good 1996 61
SPRING CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1996 60
Old Town Creek Alabama Scour Critical — Countermeasures Ineffective Good 2019 60
MATE CREEK West Virginia Scour Critical — Countermeasures Ineffective Fair 1990 60
Nueces River Texas Scour Critical — Countermeasures Ineffective Good 2024 60
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1997 60
WILBURN BRANCH Texas Scour Critical — Countermeasures Ineffective Fair 1997 60
DUCK CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1993 60
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1996 60
BRANCH OF FARMERS CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1993 60
HONDO CREEK Texas Scour Critical — Countermeasures Ineffective Good 2005 60
WARING BRANCH Texas Scour Critical — Countermeasures Ineffective Good 1998 60
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 2005 60
VILLAGE CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1993 60
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 2009 60
Big Piney Arkansas Scour Critical — Countermeasures Ineffective Poor 1931 60
POST OAK CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1961 60
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 2008 60
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 2006 60
BRANCH BRUSHY CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1968 59

Scour Critical Bridges by State

States ranked by number of scour critical bridges.

StateScour CriticalUnaddressedCountermeasuresIneffective
Texas 3,912 75 516 3,321
Pennsylvania 2,233 45 2,187 1
Louisiana 1,302 13 1,288 1
South Carolina 1,263 0 1,217 46
Oregon 1,231 4 1,221 6
Michigan 1,081 14 1,062 5
Nebraska 962 224 732 6
New York 864 9 780 75
Indiana 756 7 749 0
Wisconsin 751 0 748 3
Kansas 638 9 626 3
California 623 27 562 34
Tennessee 581 12 569 0
Washington 516 14 487 15
Puerto Rico 496 9 487 0
Alabama 450 1 423 26
Iowa 392 3 385 4
New Jersey 362 2 360 0
Florida 357 4 339 14
Oklahoma 317 33 283 1
Missouri 312 4 307 1
Mississippi 301 6 286 9
Connecticut 279 0 276 3
Minnesota 257 38 202 17
Vermont 242 0 240 2
Colorado 241 3 238 0
Idaho 215 18 186 11
South Dakota 207 3 203 1
Arkansas 187 3 129 55
Massachusetts 166 15 106 45
Montana 166 13 140 13
Arizona 164 2 160 2
West Virginia 160 2 98 60
Alaska 159 1 146 12
Maine 140 13 126 1
North Carolina 130 9 105 16
New Mexico 127 4 114 9
North Dakota 102 14 87 1
Utah 100 6 82 12
Georgia 99 1 81 17
Illinois 99 3 85 11
Nevada 94 0 85 9
Rhode Island 94 0 93 1
New Hampshire 86 2 78 6
Hawaii 83 0 82 1
Kentucky 56 16 39 1
Maryland 54 1 51 2
Wyoming 51 1 48 2
Delaware 39 0 39 0
Ohio 12 2 4 6
Virginia 8 0 8 0
District of Columbia 5 0 4 1

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.