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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
OYSTER CREEK Texas Scour Critical — Countermeasures Ineffective Good 2024 84,314
Oyster Creek Texas Scour Critical — Countermeasures Ineffective Good 2024 84,314
WILLIAM CANNON DR; WILLI Texas Scour Critical — Countermeasures Ineffective Good 2025 83,327
Honey Spring Branch Texas Scour Critical — Countermeasures Ineffective Fair 1975 81,690
PATRICK BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 1992 80,352
DRAIN Texas Scour Critical — Countermeasures Ineffective Good 2002 75,672
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1995 75,384
BIG ISLAND SLOUGH Texas Scour Critical — Countermeasures Ineffective Good 1991 75,384
TRIETSCH BRANCH Texas Scour Critical — Countermeasures Ineffective Fair 1958 74,192
MIDDLE BAYOU Texas Scour Critical — Countermeasures Ineffective Good 1971 74,100
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1998 72,861
SNAKE CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1967 70,988
TRINITY RIVER Texas Scour Critical — Countermeasures Ineffective Fair 1971 69,471
DRAW Texas Scour Critical — Countermeasures Ineffective Good 2018 67,992
IH 10 EB Exit Ramp Texas Scour Critical — Countermeasures Ineffective Fair 2020 67,900
Drain Texas Scour Critical — Countermeasures Ineffective Fair 2020 67,900
HATFIELD CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1938 67,327
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1979 66,848
HOUSTON SHIP CHANNEL Texas Scour Critical — Countermeasures Ineffective Fair 1980 65,551
Drainage Ditch Texas Scour Critical — Countermeasures Ineffective Good 2005 65,080
ROCK ISLAND RD BEAR CR Texas Scour Critical — Countermeasures Ineffective Good 2009 64,100
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1998 63,098
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1998 63,098
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1998 63,098
GOFF BRANCH Texas Scour Critical — Countermeasures Ineffective Fair 1972 59,952
Ditch H Texas Scour Critical — Countermeasures Ineffective Good 2007 59,053
WV817 anawha RV CSX RR West Virginia Scour Critical — Countermeasures Ineffective Good 2022 58,698
RICKETTS BRANCH Texas Scour Critical — Countermeasures Ineffective Fair 1964 58,666
Ricketts Branch Texas Scour Critical — Countermeasures Ineffective Fair 1964 58,666
KEEGANS BAYOU Texas Scour Critical — Countermeasures Ineffective Good 1981 57,901
Woody Branch Texas Scour Critical — Countermeasures Ineffective Fair 1965 57,539
Fivemile Creek & Loop 12 Texas Scour Critical — Countermeasures Ineffective Fair 1965 57,136
Kellner Creek Texas Scour Critical — Countermeasures Ineffective Good 2024 56,685
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 2007 56,253
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 2007 56,253
DRAW Texas Scour Critical — Countermeasures Ineffective Good 2007 56,253
OUTFALL L Texas Scour Critical — Countermeasures Ineffective Good 2010 56,253
OUTFALL J Texas Scour Critical — Countermeasures Ineffective Fair 2010 56,253
PANTHER BRANCH RELIEF Texas Scour Critical — Countermeasures Ineffective Fair 2007 56,253
PANTHER BR Texas Scour Critical — Countermeasures Ineffective Fair 2007 56,253
CRYSTAL CREEK Texas Scour Critical — Countermeasures Ineffective Good 1994 56,253
BERING DITCH Texas Scour Critical — Countermeasures Ineffective Good 1964 55,745
BRAZOS RIVER RELIEF Texas Scour Critical — Countermeasures Ineffective Good 2022 55,578
BRAZOS VALLEY RELIEF Texas Scour Critical — Countermeasures Ineffective Good 2022 55,578
CC SHIP CHANNEL Texas Scour Critical — Countermeasures Ineffective Fair 1959 55,243
Draw Texas Scour Critical — Countermeasures Ineffective Fair 1959 54,971
Draw Texas Scour Critical — Countermeasures Ineffective Good 1959 54,971
Draw Texas Scour Critical — Countermeasures Ineffective Fair 1959 54,971
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1978 54,061
Cibolo Creek Texas Scour Critical — Countermeasures Ineffective Good 2023 53,699

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