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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
HCFCD DITCH Texas Scour Critical — Countermeasures Ineffective Good 1986 23,459
STAFFORD RUN CREEK Texas Scour Critical — Countermeasures Ineffective Good 1983 23,447
BEAR BRANCH Texas Scour Critical — Countermeasures Ineffective Good 1977 23,400
SEALS GULLY Texas Scour Critical — Countermeasures Ineffective Good 2004 23,326
KOTHMAN GULLY Texas Scour Critical — Countermeasures Ineffective Good 2002 23,326
SEALS GULLY Texas Scour Critical — Countermeasures Ineffective Good 2004 23,326
THEISS GULLY Texas Scour Critical — Countermeasures Ineffective Good 1999 23,326
MILL CREEK Texas Scour Critical — Countermeasures Ineffective Good 2024 23,172
SHRIMP CHANNEL Texas Scour Critical — Countermeasures Ineffective Good 1997 23,061
COTTONWOOD CREEK TRIB Texas Scour Critical — Countermeasures Ineffective Fair 1985 23,032
BUFFALO BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 1921 22,950
WILLOW CREEK Texas Scour Critical — Countermeasures Ineffective Good 2007 22,908
MISSION FLDWY PILOT CHAN Texas Scour Critical — Countermeasures Ineffective Fair 1962 22,839
AMERICAN WATER CANAL Texas Scour Critical — Countermeasures Ineffective Fair 1949 22,721
CLEAR CREEK Texas Scour Critical — Countermeasures Ineffective Good 1949 22,721
Clear Creek Texas Scour Critical — Countermeasures Ineffective Good 2002 22,721
FORT BEND COUNTY DITCH A Texas Scour Critical — Countermeasures Ineffective Fair 1993 22,721
RIO GRANDE RIVER Texas Scour Critical — Countermeasures Ineffective Fair 1976 22,500
RR CSXT South Carolina Scour Critical — Countermeasures Ineffective Good 1994 22,000
RR CSXT South Carolina Scour Critical — Countermeasures Ineffective Good 1994 22,000
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1949 21,930
PRAIRIE CREEK TRIBUTARY Texas Scour Critical — Countermeasures Ineffective Good 1978 21,801
STEWART CRK BR Texas Scour Critical — Countermeasures Ineffective Fair 1947 21,800
ROWLETT CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1999 21,740
ROWLETT CREEK TRIBUTARY Texas Scour Critical — Countermeasures Ineffective Fair 1999 21,740
ARROYO ROMA Texas Scour Critical — Countermeasures Ineffective Good 2008 21,738
MAIN FLDWY PILOT CHANNEL Texas Scour Critical — Countermeasures Ineffective Good 2000 21,729
COWART CREEK TRIBUTARY Texas Scour Critical — Countermeasures Ineffective Fair 1999 21,633
Martin Branch Texas Scour Critical — Countermeasures Ineffective Fair 1947 21,620
HCFCD #0107-00-00 Texas Scour Critical — Countermeasures Ineffective Good 2002 21,590
HCFCD #0107-00-00 Texas Scour Critical — Countermeasures Ineffective Good 2002 21,590
PEARL RIVER Mississippi Scour Critical — Countermeasures Ineffective Fair 1965 21,500
PEARL RIVER Mississippi Scour Critical — Countermeasures Ineffective Fair 1965 21,500
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1969 21,389
FLAT CREEK Texas Scour Critical — Countermeasures Ineffective Good 1941 21,347
DRY BRANCH CREEK Texas Scour Critical — Countermeasures Ineffective Good 1941 21,347
LITTLE SOUS CREEK Texas Scour Critical — Countermeasures Ineffective Good 1941 21,347
Drainage Ditch Texas Scour Critical — Countermeasures Ineffective Good 2007 21,340
WHITE OAK BYU / IH10 WB Texas Scour Critical — Countermeasures Ineffective Good 1990 21,330
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1950 21,294
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1950 21,294
DRAW Texas Scour Critical — Countermeasures Ineffective Good 1950 21,294
DRAW Texas Scour Critical — Countermeasures Ineffective Good 1950 21,294
DRAW Texas Scour Critical — Countermeasures Ineffective Good 1968 21,255
DRAIN Texas Scour Critical — Countermeasures Ineffective Good 2024 21,252
BERRY BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 1960 21,140
SEABOURNE CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1931 20,924
HCFCD DITCH K Texas Scour Critical — Countermeasures Ineffective Good 1992 20,827
LITTLE VINCE BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 1977 20,730
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1950 20,678

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