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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
WHITE ROCK CREEK BRANCH Texas Scour Critical — Countermeasures Ineffective Fair 1953 187,971
HCFCD DITCH A-119-07-00 Texas Scour Critical — Countermeasures Ineffective Fair 1993 184,745
STORM SEWER CROSSING Texas Scour Critical — Countermeasures Ineffective Good 2016 184,461
Storm Sewer Lateral Texas Scour Critical — Countermeasures Ineffective Fair 1970 183,561
Draw Texas Scour Critical — Countermeasures Ineffective Poor 1969 182,015
LITTLE WHITE OAK BYU Texas Scour Critical — Countermeasures Ineffective Fair 1960 179,357
CARTERS SLOUGH Trib Texas Scour Critical — Countermeasures Ineffective Good 2001 170,688
Carters Slough Texas Scour Critical — Countermeasures Ineffective Good 1990 170,688
WEST CANAL Texas Scour Critical — Countermeasures Ineffective Fair 1950 170,605
GOODYEAR CREEK Texas Scour Critical — Countermeasures Ineffective Good 1983 170,605
BUFFALO BAYOU & BW 8 FR Texas Scour Critical — Countermeasures Ineffective Fair 1987 166,838
BUFFALO BAYOU & BW 8 FR Texas Scour Critical — Countermeasures Ineffective Fair 1987 166,838
DITCH H Texas Scour Critical — Countermeasures Ineffective Good 2012 164,000
DRAIN Texas Scour Critical — Countermeasures Ineffective Fair 2007 154,871
TURKEY GULLY Texas Scour Critical — Countermeasures Ineffective Good 1963 150,189
HCFCD DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1990 146,425
SUNSET CREEK Washington Scour Critical — Countermeasures Ineffective Good 2024 139,482
Clear Creek Tributary Texas Scour Critical — Countermeasures Ineffective Good 2024 133,911
P.C. AVE RF Dr/AR River Arkansas Scour Critical — Countermeasures Ineffective Good 2024 133,000
SAN JACINTO RIVER RELIEF Texas Scour Critical — Countermeasures Ineffective Fair 1982 130,710
PARKER/SAUNDERS/HALLS BY Texas Scour Critical — Countermeasures Ineffective Fair 1995 115,614
PARKER/SAUNDERS/HALLS BY Texas Scour Critical — Countermeasures Ineffective Fair 1995 115,614
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1964 110,243
EVANS GULLY Texas Scour Critical — Countermeasures Ineffective Fair 2007 109,434
Mesquite Creek Texas Scour Critical — Countermeasures Ineffective Good 2022 104,109
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1995 102,959
CEDAR CREEK/DART RR Texas Scour Critical — Countermeasures Ineffective Good 2024 101,192
MCGEE GULLY Texas Scour Critical — Countermeasures Ineffective Good 1960 100,533
DRAIN Texas Scour Critical — Countermeasures Ineffective Good 2002 100,302
CYPRESS CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1998 97,280
SENGER GULLY Texas Scour Critical — Countermeasures Ineffective Good 1998 97,280
HCFCD DITCH Texas Scour Critical — Countermeasures Ineffective Good 1996 94,773
DRAIN Texas Scour Critical — Countermeasures Ineffective Good 1969 94,680
Middle Bayou Tributary Texas Scour Critical — Countermeasures Ineffective Good 1971 94,650
DITCH H Texas Scour Critical — Countermeasures Ineffective Good 2006 94,650
Leon Creek Texas Scour Critical — Countermeasures Ineffective Good 2024 93,361
RABBS BAYOU Texas Scour Critical — Countermeasures Ineffective Good 2015 93,035
SALUDA RIVER South Carolina Scour Critical — Countermeasures Ineffective Good 2024 91,400
CSX RAILROAD South Carolina Scour Critical — Countermeasures Ineffective Good 2024 91,400
S MESQUITE CREEK Texas Scour Critical — Countermeasures Ineffective Good 1971 91,008
DRY WASH Nevada Scour Critical — Countermeasures Ineffective Fair 1993 91,000
BOGGY BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 1963 90,072
Farmers Branch Texas Scour Critical — Countermeasures Ineffective Fair 1979 87,761
Farmers Branch Texas Scour Critical — Countermeasures Ineffective Fair 1979 87,761
EAST FORK TRINITY RIVER Texas Scour Critical — Countermeasures Ineffective Good 2024 87,026
E FORK TRINITY RELIEF #1 Texas Scour Critical — Countermeasures Ineffective Good 2024 87,026
TRIB W FRK TRINITY RIVER Texas Scour Critical — Countermeasures Ineffective Fair 1963 86,240
WHITE OAK CREEK Texas Scour Critical — Countermeasures Ineffective Fair 2007 86,096
US 380 & Parvin Branch Texas Scour Critical — Countermeasures Ineffective Good 2023 85,136
US 380 & Parvin Branch Texas Scour Critical — Countermeasures Ineffective Fair 2023 85,136

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