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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
ELM CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1950 27,324
CANEY CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1950 27,324
ALCORN BAYOU Texas Scour Critical — Countermeasures Ineffective Good 1971 27,291
Brazos River Texas Scour Critical — Countermeasures Ineffective Good 2008 27,291
LITTLE CEDAR BAYOU Texas Scour Critical — Countermeasures Ineffective Good 1969 27,169
LITTLE CEDAR BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 1969 27,169
SALT CREEK Illinois Scour Critical — Countermeasures Ineffective Good 2017 27,100
IH10 BW8 BROOKVIEW DR Texas Scour Critical — Countermeasures Ineffective Fair 1994 27,080
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1947 26,940
Draw Texas Scour Critical — Countermeasures Ineffective Good 2024 26,397
Drain Texas Scour Critical — Countermeasures Ineffective Good 1942 26,219
CLEAR CREEK Texas Scour Critical — Countermeasures Ineffective Good 1992 26,147
COW BAYOU Texas Scour Critical — Countermeasures Ineffective Good 1925 26,144
MUDDY CEDAR CREEK REL Texas Scour Critical — Countermeasures Ineffective Fair 1965 26,006
I-294/I-90/Willow Creek Illinois Scour Critical — Countermeasures Ineffective Fair 1958 26,000
OUTFALL 1 Texas Scour Critical — Countermeasures Ineffective Good 2010 25,956
LONG POINT CREEK Texas Scour Critical — Countermeasures Ineffective Good 2004 25,950
ARROYO COLORADO Texas Scour Critical — Countermeasures Ineffective Good 1978 25,847
MERCEDES MAIN CANAL Texas Scour Critical — Countermeasures Ineffective Good 2008 25,790
MERCEDES MAIN CANAL Texas Scour Critical — Countermeasures Ineffective Good 2008 25,790
NORTH FLOODWAY CHANNEL Texas Scour Critical — Countermeasures Ineffective Good 2007 25,710
NORTH FLOODWAY CHANNEL Texas Scour Critical — Countermeasures Ineffective Good 2007 25,710
DRAIN Texas Scour Critical — Countermeasures Ineffective Good 1970 25,264
MUD CREEK Texas Scour Critical — Countermeasures Ineffective Fair 2015 25,236
MUD CREEK Texas Scour Critical — Countermeasures Ineffective Good 2015 25,236
SALADO CREEK EAST Texas Scour Critical — Countermeasures Ineffective Good 2015 25,236
SALADO CREEK EAST Texas Scour Critical — Countermeasures Ineffective Good 2015 25,236
HCFCD DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1993 25,090
DRAIN Texas Scour Critical — Countermeasures Ineffective Good 1978 25,010
SUGAR CREEK North Carolina Scour Critical — Countermeasures Ineffective Good 1960 25,000
SPRING CREEK Texas Scour Critical — Countermeasures Ineffective Good 2002 24,991
Salitrillo Creek Texas Scour Critical — Countermeasures Ineffective Good 2023 24,987
SPRING CREEK TRIBUTARY Texas Scour Critical — Countermeasures Ineffective Fair 2000 24,947
W Frk Crystal Crk Trib 1 Texas Scour Critical — Countermeasures Ineffective Good 2024 24,858
E Fork Crystal Crk Texas Scour Critical — Countermeasures Ineffective Good 2024 24,858
STILLHOUSE CREEK Texas Scour Critical — Countermeasures Ineffective Poor 1959 24,836
HICKORY SLOUGH Texas Scour Critical — Countermeasures Ineffective Fair 2023 24,760
AMERICAN CANAL Texas Scour Critical — Countermeasures Ineffective Good 2023 24,702
MCALLEN LATERAL DRAIN Texas Scour Critical — Countermeasures Ineffective Good 1978 24,582
Bypass Channel Florida Scour Critical — Countermeasures Ineffective Good 1999 24,500
E Fork Cooper Creek Florida Scour Critical — Countermeasures Ineffective Fair 1995 24,500
COWART CREEK Texas Scour Critical — Countermeasures Ineffective Good 1996 24,400
WILLOW CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1971 24,372
Brays Bayou Texas Scour Critical — Countermeasures Ineffective Good 2024 24,161
Drainage Ditch Texas Scour Critical — Countermeasures Ineffective Good 1967 24,160
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1977 24,160
BENS BR TRIB OUTFALL #1 Texas Scour Critical — Countermeasures Ineffective Fair 2006 23,864
EDINBURG MAIN CANAL Texas Scour Critical — Countermeasures Ineffective Good 2002 23,730
DICKEYS BRANCH Texas Scour Critical — Countermeasures Ineffective Fair 1928 23,728
IRRIGATION CANAL Texas Scour Critical — Countermeasures Ineffective Fair 1949 23,498

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