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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
OYSTER CREEK Texas Scour Critical — Countermeasures Ineffective Good 1984 41,211
HCFCD DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 2001 40,970
TURTLE CREEK Texas Scour Critical — Countermeasures Ineffective Good 1957 40,814
LAKE CONROE CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1972 40,249
RUSH CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1972 40,249
E PRONG WHITES CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1965 40,131
DRAW Texas Scour Critical — Countermeasures Ineffective Good 1965 40,131
BUFFALO BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 2006 40,030
HCFCD DITCH M122-00-00 Texas Scour Critical — Countermeasures Ineffective Good 2015 40,011
RESACA DE LOS FRESNOS Texas Scour Critical — Countermeasures Ineffective Good 2005 39,897
RESACA DE LOS FRESNOS Texas Scour Critical — Countermeasures Ineffective Good 2005 39,897
SHAWNEE CREEK Texas Scour Critical — Countermeasures Ineffective Good 1991 39,734
DRAIN Texas Scour Critical — Countermeasures Ineffective Good 1991 39,488
OUTFALL 12 Texas Scour Critical — Countermeasures Ineffective Good 2010 39,251
BEAR BRANCH CREEK Texas Scour Critical — Countermeasures Ineffective Fair 2010 39,251
STAFFORD RUN CREEK Texas Scour Critical — Countermeasures Ineffective Good 1984 39,170
AMERICAN WATER CANAL Texas Scour Critical — Countermeasures Ineffective Good 1984 39,170
TRIB TO JUANITA CR Washington Scour Critical — Countermeasures Ineffective Good 2023 38,957
DRAW Texas Scour Critical — Countermeasures Ineffective Good 2012 38,790
CANE BR BUFFALO BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 1967 38,127
BUFFALO BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 1954 36,900
Drainage Ditch Texas Scour Critical — Countermeasures Ineffective Fair 1990 36,829
FM518; FM2094; CLEAR CRK Texas Scour Critical — Countermeasures Ineffective Good 2024 36,400
LAKE HOUSTON (E BRIDGE) Texas Scour Critical — Countermeasures Ineffective Fair 1988 35,866
LAKE HOUSTON (W BRIDGE) Texas Scour Critical — Countermeasures Ineffective Fair 1988 35,866
CANEY CREEK BRANCH Texas Scour Critical — Countermeasures Ineffective Fair 1962 35,783
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1994 35,669
SENGER GULLY Texas Scour Critical — Countermeasures Ineffective Good 1986 35,579
BRAYS BAYOU Texas Scour Critical — Countermeasures Ineffective Fair 2003 35,413
DRAW Texas Scour Critical — Countermeasures Ineffective Fair 1963 35,132
Stone Dam Creek Arkansas Scour Critical — Countermeasures Ineffective Good 2013 35,000
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1975 34,913
HCFCD DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1960 34,800
HCFCD DITCH A-109 Texas Scour Critical — Countermeasures Ineffective Good 2008 34,130
OCMULGEE RIVER Georgia Scour Critical — Countermeasures Ineffective Good 2024 33,950
TRIB OF COFFEE CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1971 33,946
Guyandotte R CR60/52&26 West Virginia Scour Critical — Countermeasures Ineffective Poor 1959 33,900
BUFFALO CREEK RELIEF Texas Scour Critical — Countermeasures Ineffective Poor 1955 33,856
BUFFALO CREEK RELIEF Texas Scour Critical — Countermeasures Ineffective Poor 1955 33,856
BUFFALO CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1955 33,856
BUFFALO CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1955 33,856
Pecan Creek Texas Scour Critical — Countermeasures Ineffective Fair 1948 33,645
CANGELOSI DITCH Texas Scour Critical — Countermeasures Ineffective Good 1988 33,601
CLEAR CREEK Texas Scour Critical — Countermeasures Ineffective Good 1996 33,433
CARPENTERS BAYOU Texas Scour Critical — Countermeasures Ineffective Good 1985 33,366
DRY CREEK Texas Scour Critical — Countermeasures Ineffective Fair 1977 33,210
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1975 32,790
BENS BR TRIB OUTFALL #2 Texas Scour Critical — Countermeasures Ineffective Good 1960 32,776
WATERS CREEK Texas Scour Critical — Countermeasures Ineffective Good 1999 32,756
BROOKHAVEN DR/CEDAR CRK Texas Scour Critical — Countermeasures Ineffective Good 2024 32,700

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