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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
PEACH CREEK Texas Scour Critical — Countermeasures Ineffective Good 2009 53,654
Oyster Creek Texas Scour Critical — Countermeasures Ineffective Fair 1994 53,643
Woman Hollering Creek Texas Scour Critical — Countermeasures Ineffective Good 2023 53,535
SH 367 RR CREEK Arkansas Scour Critical — Countermeasures Ineffective Poor 1961 53,500
SH 367 RR CREEK Arkansas Scour Critical — Countermeasures Ineffective Poor 1961 53,500
DRAW Texas Scour Critical — Countermeasures Ineffective Good 1959 52,671
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1970 52,500
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1948 52,006
Unnamed Channel Texas Scour Critical — Countermeasures Ineffective Good 2004 49,733
OYSTER CREEK Texas Scour Critical — Countermeasures Ineffective Good 2002 49,398
HCFCD DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1965 49,322
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1957 49,281
NO NAME CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1957 49,281
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1957 49,281
BRUSHY CREEK RELIEF Texas Scour Critical — Countermeasures Ineffective Fair 1957 49,281
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1957 49,281
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1957 49,281
DITCH H Texas Scour Critical — Countermeasures Ineffective Good 2006 48,424
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1957 47,917
GRAPEVINE CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1979 47,751
GRAPEVINE CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1979 47,751
W FK SAN JACINTO RI Texas Scour Critical — Countermeasures Ineffective Fair 1994 47,121
SAN JACINTO RI W REL Texas Scour Critical — Countermeasures Ineffective Good 1994 47,121
SAN JACINTO RI E REL Texas Scour Critical — Countermeasures Ineffective Good 1994 47,121
BUFFALO BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 2004 46,700
Piney Point Gulley Texas Scour Critical — Countermeasures Ineffective Fair 1931 46,429
JORDAN GULLY Texas Scour Critical — Countermeasures Ineffective Good 2024 46,415
Channel (NO FEMa ID) Texas Scour Critical — Countermeasures Ineffective Good 2024 46,415
HCFCD G103-37-02 Texas Scour Critical — Countermeasures Ineffective Good 2024 46,415
EAST ELM CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1957 46,341
La Quinta Drainage Ditch Texas Scour Critical — Countermeasures Ineffective Good 2024 45,911
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 2002 45,662
OYSTER CREEK Texas Scour Critical — Countermeasures Ineffective Good 1967 45,662
DRAIN Texas Scour Critical — Countermeasures Ineffective Fair 2004 45,574
PHARR-MCALLEN LATERAL Texas Scour Critical — Countermeasures Ineffective Good 1985 45,389
SCOTT CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1948 44,371
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1948 44,371
IH 69 WHITE OAK CREEK Texas Scour Critical — Countermeasures Ineffective Good 2016 43,992
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 2010 43,956
DRAIN Texas Scour Critical — Countermeasures Ineffective Good 1929 43,900
LONG BRANCH Texas Scour Critical — Countermeasures Ineffective Fair 1955 43,399
CLEAR CRK CHANNEL NO. 2 Texas Scour Critical — Countermeasures Ineffective Fair 1992 43,210
LITTLE CYPRESS CREEK Texas Scour Critical — Countermeasures Ineffective Fair 2015 42,740
DRAIN Texas Scour Critical — Countermeasures Ineffective Good 2021 42,502
DRAIN Texas Scour Critical — Countermeasures Ineffective Good 2018 42,502
WHITE ROCK CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1964 42,037
WHITE ROCK CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1964 42,037
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1965 41,907
HCFCD CHANNEL A-119-06 Texas Scour Critical — Countermeasures Ineffective Good 1989 41,860
FM 270 & COW BAYOU Texas Scour Critical — Countermeasures Ineffective Good 2008 41,441

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