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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
BIG CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1960 2,420
LITTLE VINCE BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 1982 2,418
HOLLIDAY CREEK Texas Scour Critical — Countermeasures Ineffective Good 2000 2,418
SAN MIGUEL CREEK Texas Scour Critical — Countermeasures Ineffective Good 1978 2,415
MICHIGAN CREEK New York Scour Critical — Countermeasures Ineffective Good 2024 2,411
DRAW Texas Scour Critical — Countermeasures Ineffective Good 1970 2,406
RESACA DE LOS FRESNOS Texas Scour Critical — Countermeasures Ineffective Good 2006 2,393
DRAW Texas Scour Critical — Countermeasures Ineffective Good 1927 2,390
BRUSHY CRK Texas Scour Critical — Countermeasures Ineffective Good 1955 2,377
REEDER CRK Texas Scour Critical — Countermeasures Ineffective Good 1955 2,377
RIGGS RD/LTL WHT OAK Texas Scour Critical — Countermeasures Ineffective Good 1999 2,377
SHEFFIELD CRK Texas Scour Critical — Countermeasures Ineffective Good 1959 2,377
BEAR PEN CREEK Texas Scour Critical — Countermeasures Ineffective Good 1963 2,370
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1970 2,354
MILL BRANCH CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1954 2,350
WILLOW WATERHOLE BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 1953 2,335
MIDDLE SULPHUR RIV Texas Scour Critical — Countermeasures Ineffective Fair 1959 2,327
MIDDLE SULPHUR REL Texas Scour Critical — Countermeasures Ineffective Fair 1959 2,327
DRAW Texas Scour Critical — Countermeasures Ineffective Good 1959 2,327
COTTONWOOD RELIEF Texas Scour Critical — Countermeasures Ineffective Fair 1951 2,325
SANDERS CREEK RELIEF Texas Scour Critical — Countermeasures Ineffective Fair 1951 2,325
SANDERS CREEK Texas Scour Critical — Countermeasures Ineffective Good 1988 2,325
COTTONWOOD CREEK Texas Scour Critical — Countermeasures Ineffective Good 1988 2,325
SPRING CREEK Texas Scour Critical — Countermeasures Ineffective Good 1988 2,320
OAK RIDGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1994 2,309
CHINQUAPIN CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1950 2,306
Hondo Creek Texas Scour Critical — Countermeasures Ineffective Good 2024 2,300
DRAW Texas Scour Critical — Countermeasures Ineffective Good 1959 2,292
WOLF CREEK Texas Scour Critical — Countermeasures Ineffective Good 1961 2,289
WOLF CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1974 2,286
DRAW Texas Scour Critical — Countermeasures Ineffective Good 2001 2,285
VALLEY CREEK Texas Scour Critical — Countermeasures Ineffective Good 2024 2,278
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1927 2,277
DRAW Texas Scour Critical — Countermeasures Ineffective Good 1959 2,277
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1970 2,272
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1960 2,268
CHIMNEY ROCK DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1966 2,260
CLEAR CREEK Texas Scour Critical — Countermeasures Ineffective Good 1955 2,252
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 2010 2,250
STEWARTS CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1980 2,246
LEON CREEK Texas Scour Critical — Countermeasures Ineffective Good 2015 2,241
WHITE OAK CREEK Texas Scour Critical — Countermeasures Ineffective Good 1981 2,228
WHITE OAK CREEK REL #1 Texas Scour Critical — Countermeasures Ineffective Fair 1981 2,228
WHITE OAK CREEK REL #2 Texas Scour Critical — Countermeasures Ineffective Good 1981 2,228
LICK CREEK Texas Scour Critical — Countermeasures Ineffective Good 1986 2,225
CHAMBERS CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1981 2,219
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1931 2,211
PRAIRIE CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1961 2,210
WATER STONY BROOK Massachusetts Scour Critical — Countermeasures Ineffective Fair 1850 2,208
UNNAMED CREEK NO 1 Mississippi Scour Critical — Countermeasures Ineffective Good 2005 2,200

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.

All Bridges Poor Condition Historic Bridges Bridge Stats