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
Trib of Big Mineral Ck Texas Scour Critical — Countermeasures Ineffective Fair 2012 88
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 2010 88
BR OF ROCK CK Texas Scour Critical — Countermeasures Ineffective Fair 1961 85
WHEELER CREEK Texas Scour Critical — Countermeasures Ineffective Good 2007 84
MOUND CREEK Texas Scour Critical — Countermeasures Ineffective Good 2010 84
WHEAT CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1995 83
BOND CREEK Texas Scour Critical — Countermeasures Ineffective Good 2023 82
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1995 82
LIVE OAK CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1975 82
BITTER CREEK Texas Scour Critical — Countermeasures Ineffective Good 1969 81
FLOYD BRANCH Texas Scour Critical — Countermeasures Ineffective Fair 1957 80
DUCK CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1993 80
E BR MONGAUP RVR New York Scour Critical — Countermeasures Ineffective Good 2024 80
QUINTA CREEK Texas Scour Critical — Countermeasures Ineffective Good 1989 80
PETRONILA CREEK Texas Scour Critical — Countermeasures Ineffective Good 2006 80
FOURMILE CREEK West Virginia Scour Critical — Countermeasures Ineffective Poor 1978 80
HCFCD DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1986 80
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1996 80
BRUSHY CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1983 80
LEON CREEK Texas Scour Critical — Countermeasures Ineffective Good 2005 80
MADERA DRAINAGE CANAL Texas Scour Critical — Countermeasures Ineffective Fair 2008 80
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1996 80
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 2013 79
YELLOW CREEK Alabama Scour Critical — Countermeasures Ineffective Poor 1950 79
MALLARD CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1974 78
ELAINES CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1963 78
Dry Creek Texas Scour Critical — Countermeasures Ineffective Fair 1995 76
TOWNSEND CREEK Texas Scour Critical — Countermeasures Ineffective Good 2004 76
Footbridge Trail Washington Scour Critical — Countermeasures Ineffective Good 2023 75
BLACKBERRY CREEK Texas Scour Critical — Countermeasures Ineffective Good 1966 75
South Fork Zumbro River Minnesota Scour Critical — Countermeasures Ineffective Poor 1895 75
Creek Alabama Scour Critical — Countermeasures Ineffective Good 2023 75
WILD HORSE SLOUGH Texas Scour Critical — Countermeasures Ineffective Good 2009 75
STREAM Illinois Scour Critical — Countermeasures Ineffective Fair 1953 75
SALT CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1998 72
TRIB OF BRUSHY CREEK Texas Scour Critical — Countermeasures Ineffective Fair 2006 72
SOAP CREEK TRIBUTARY Texas Scour Critical — Countermeasures Ineffective Fair 2002 72
BRANCH MID BELKNAP CREEK Texas Scour Critical — Countermeasures Ineffective Good 2008 72
CREEK Arkansas Scour Critical — Countermeasures Ineffective Good 1998 72
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1935 71
COWHOUSE CREEK Texas Scour Critical — Countermeasures Ineffective Good 1997 71
BEAR CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1935 71
NEDDY CREEK Texas Scour Critical — Countermeasures Ineffective Good 2009 70
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1983 70
BUFFALO BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 2011 70
CLEAR CREEK DRAW Texas Scour Critical — Countermeasures Ineffective Fair 2004 70
MUD FORK West Virginia Scour Critical — Countermeasures Ineffective Poor 1982 70
SALT CREEK Texas Scour Critical — Countermeasures Ineffective Good 2016 70
MAIN DITCH Arkansas Scour Critical — Countermeasures Ineffective Fair 2001 70
MIDDLE CREEK West Virginia Scour Critical — Countermeasures Ineffective Poor 1979 70

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.