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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
DEER CREEK Texas Scour Critical — Unaddressed Poor 1957 3,770
THOMPSON CREEK Louisiana Scour Critical — Unaddressed Fair 1959 3,675
MUD CREEK TRIBUTARY Nebraska Scour Critical — Unaddressed Poor 1935 3,605
ROBBINS BRANCH Mississippi Scour Critical — Unaddressed Fair 1960 3,500
CEDAR CREEK Nebraska Scour Critical — Unaddressed Poor 1935 3,500
COTTONWOOD CREEK Texas Scour Critical — Unaddressed Fair 1940 3,307
WATER ASNEBUMSKIT BROOK Massachusetts Scour Critical — Unaddressed Good 1985 3,100
BOWMAN CANYON California Scour Critical — Unaddressed Poor 1948 3,056
PALO GAUCHO BAYOU Texas Scour Critical — Unaddressed Fair 1964 3,007
BRICKYARD CREEK California Scour Critical — Unaddressed Poor 1960 3,000
Town Branch Texas Scour Critical — Unaddressed Poor 1935 2,970
WATER SQUANNACOOK RIVER Massachusetts Scour Critical — Unaddressed Fair 1850 2,300
JAMES RIVER South Dakota Scour Critical — Unaddressed Fair 1952 2,250
BRANCH Tennessee Scour Critical — Unaddressed Poor 1940 2,242
TRIB TO DEEP CREEK Pennsylvania Scour Critical — Unaddressed Poor 1991 2,214
Bayou Carencro Louisiana Scour Critical — Unaddressed Fair 1979 2,067
BLACK CANYON WASH Arizona Scour Critical — Unaddressed Poor 1986 2,051
LITTLE ELM CREEK Texas Scour Critical — Unaddressed Fair 1948 2,025
LEGGETTS CREEK Pennsylvania Scour Critical — Unaddressed Poor 1979 2,000
JAMES RIVER North Dakota Scour Critical — Unaddressed Good 1965 1,825
SCIOTO CREEK Pennsylvania Scour Critical — Unaddressed Poor 1932 1,793
LAMPASAS RIVER Texas Scour Critical — Unaddressed Fair 1966 1,776
APPENZELL CREEK Pennsylvania Scour Critical — Unaddressed Poor 1941 1,773
BURNS DITCH (DEEP RIVER) Indiana Scour Critical — Unaddressed Poor 1970 1,763
HIGHBANK CREEK Michigan Scour Critical — Unaddressed Poor 1950 1,690
SOUTH DRY RUN Pennsylvania Scour Critical — Unaddressed Poor 1913 1,634
BELLEVILLE LK HURON RIVR Michigan Scour Critical — Unaddressed Poor 1947 1,610
Chipola River Florida Scour Critical — Unaddressed Poor 1966 1,600
WALNUT CREEK Nebraska Scour Critical — Unaddressed Poor 1937 1,585
MILL CREEK Nebraska Scour Critical — Unaddressed Poor 1935 1,500
DRAW Texas Scour Critical — Unaddressed Poor 1972 1,472
ELM CREEK Minnesota Scour Critical — Unaddressed Poor 1977 1,456
DRAW Texas Scour Critical — Unaddressed Fair 1967 1,421
S BR WEEPING WATER CREEK Nebraska Scour Critical — Unaddressed Poor 1989 1,405
WATER MILL RIVER Massachusetts Scour Critical — Unaddressed Poor 1918 1,400
MIDDLE FORK WILDCAT CREE Washington Scour Critical — Unaddressed Poor 1921 1,325
TAYLOR CREEK TRIBUTARY Florida Scour Critical — Unaddressed Fair 1957 1,300
WATER DEERFIELD RIVER Massachusetts Scour Critical — Unaddressed Fair 1949 1,300
Ditch Texas Scour Critical — Unaddressed Poor 1997 1,235
CHEF MENTEUR PASS Louisiana Scour Critical — Unaddressed Poor 1930 1,215
N FK CROW RIVER Minnesota Scour Critical — Unaddressed Fair 1963 1,200
PORTNEUF RIVER Idaho Scour Critical — Unaddressed Poor 1962 1,200
ELM CREEK Minnesota Scour Critical — Unaddressed Poor 1966 1,153
ANN RIVER Minnesota Scour Critical — Unaddressed Fair 1969 1,100
EL JOBO CREEK Puerto Rico Scour Critical — Unaddressed Poor 1940 1,100
WABASH RIVER & SERVICE R Indiana Scour Critical — Unaddressed Poor 1930 1,065
STOMP DANCE CREEK Oklahoma Scour Critical — Unaddressed Poor 1975 1,030
ANTIETAM CREEK Pennsylvania Scour Critical — Unaddressed Poor 1968 1,017
TALLABOA RIVER Puerto Rico Scour Critical — Unaddressed Poor 1972 1,000
HAMMONTON CREEK New Jersey Scour Critical — Unaddressed Poor 1931 978

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