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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
BRAZOS RIVER Texas Scour Critical — Countermeasures Ineffective Good 2021 32,644
W BR OF SALITRILLO CRK Texas Scour Critical — Countermeasures Ineffective Fair 1963 32,395
LTL ELM/LK LEWISVILLE Texas Scour Critical — Countermeasures Ineffective Good 2014 32,313
HCFCD DITCH K124-02-00 Texas Scour Critical — Countermeasures Ineffective Good 1991 32,248
HCFCD DITCH Texas Scour Critical — Countermeasures Ineffective Good 1990 32,131
W CANEY CREEK Texas Scour Critical — Countermeasures Ineffective Good 1950 32,060
RILEY CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1925 32,048
LINDLEY CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1925 32,048
FORESTBROOK RD South Carolina Scour Critical — Countermeasures Ineffective Good 2004 31,900
FOREST BROOK RD South Carolina Scour Critical — Countermeasures Ineffective Good 2004 31,900
IRON ORE CREEK Texas Scour Critical — Countermeasures Ineffective Good 1984 31,854
IRON ORE CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1987 31,854
NICKABURR CREEK Texas Scour Critical — Countermeasures Ineffective Good 2010 31,665
HCFCD DITCH A-111-00-00 Texas Scour Critical — Countermeasures Ineffective Good 1995 31,638
FUTURE DRAINAGE CHANNEL Texas Scour Critical — Countermeasures Ineffective Good 1996 31,638
IH 10 & Mercantile Pkwy Texas Scour Critical — Countermeasures Ineffective Good 2013 31,240
IH 10 & Mercantile Pkwy Texas Scour Critical — Countermeasures Ineffective Good 2013 31,240
US 181 Texas Scour Critical — Countermeasures Ineffective Good 2023 31,009
BUFFALO BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 1955 30,963
SH 4 12-14 & 24TH ST Texas Scour Critical — Countermeasures Ineffective Good 1969 30,670
SH 4 12-14 & 24TH ST Texas Scour Critical — Countermeasures Ineffective Good 1969 30,670
TIMBER CREEK Texas Scour Critical — Countermeasures Ineffective Good 1993 30,546
Unnamed Channel Texas Scour Critical — Countermeasures Ineffective Good 2004 30,474
SEPULGA RIVER Alabama Scour Critical — Countermeasures Ineffective Good 2024 30,356
SEPULGA RIVER REL Alabama Scour Critical — Countermeasures Ineffective Good 2024 30,356
SEPULGA RIVER REL Alabama Scour Critical — Countermeasures Ineffective Good 2024 30,356
HALLS BAYOU Texas Scour Critical — Countermeasures Ineffective Good 1987 30,000
UPRR & HCFCD DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1987 30,000
SHIREY CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1971 30,000
HCFCD DITCH Texas Scour Critical — Countermeasures Ineffective Good 1987 30,000
W TRIB #4 Texas Scour Critical — Countermeasures Ineffective Good 1988 29,631
PRAIRIE CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1971 29,620
PHARR-MCALLEN LATERAL Texas Scour Critical — Countermeasures Ineffective Good 1985 29,300
RESACA DE LOS FRESNOS Texas Scour Critical — Countermeasures Ineffective Fair 1998 29,060
LITTLE CANEY CRK Texas Scour Critical — Countermeasures Ineffective Good 1988 28,997
UPRR & HCFCD DITCH Texas Scour Critical — Countermeasures Ineffective Fair 2006 28,600
UPRR & HCFCD DITCH Texas Scour Critical — Countermeasures Ineffective Good 2006 28,600
DRAIN Texas Scour Critical — Countermeasures Ineffective Fair 1961 28,550
MCCALL CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1947 28,331
WEST CANAL Texas Scour Critical — Countermeasures Ineffective Fair 1982 28,097
DRAW Texas Scour Critical — Countermeasures Ineffective Good 1971 28,048
CYPRESS CREEK Texas Scour Critical — Countermeasures Ineffective Good 2013 27,912
EAST SLOUGH Texas Scour Critical — Countermeasures Ineffective Poor 1930 27,805
MISSION INLET FLOODWAY Texas Scour Critical — Countermeasures Ineffective Good 2000 27,788
ALLIGATOR CRK Texas Scour Critical — Countermeasures Ineffective Fair 1947 27,758
BULLHEAD BAYOU Texas Scour Critical — Countermeasures Ineffective Good 1925 27,544
BULLHEAD BAYOU Texas Scour Critical — Countermeasures Ineffective Good 1942 27,544
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1940 27,534
MEDINA RIVER Texas Scour Critical — Countermeasures Ineffective Fair 1940 27,368
Drain Texas Scour Critical — Countermeasures Ineffective Fair 1956 27,332

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