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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
RACCOON R & TRAIL Iowa Scour Critical — Countermeasures Installed Fair 1915 7,253
MIDDLE BR WHITE CLAY CR Pennsylvania Scour Critical — Countermeasures Installed Fair 1934 7,252
TEN MILE RIVER Rhode Island Scour Critical — Countermeasures Installed Fair 1926 7,250
PENNSYLVANIA CANAL Pennsylvania Scour Critical — Countermeasures Installed Poor 1930 7,243
HURON RIVER Michigan Scour Critical — Countermeasures Installed Fair 1961 7,241
TURTLE CREEK Texas Scour Critical — Countermeasures Installed Fair 1973 7,237
CHEHALIS RIVER Washington Scour Critical — Countermeasures Installed Fair 1971 7,228
ROCK RUN Pennsylvania Scour Critical — Countermeasures Installed Fair 1955 7,226
Rickreall Creek Oregon Scour Critical — Countermeasures Installed Fair 1918 7,225
Rickreall Creek Oregon Scour Critical — Countermeasures Installed Fair 1969 7,225
EMORY RIVER Tennessee Scour Critical — Countermeasures Installed Poor 1992 7,216
Salmon River Oregon Scour Critical — Countermeasures Installed Poor 1930 7,215
COYELL CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1953 7,215
WEST COLYELL CR Louisiana Scour Critical — Countermeasures Installed Fair 1963 7,211
FLINT CREEK RELIEF Alabama Scour Critical — Countermeasures Installed Fair 1968 7,205
FLINT CREEK RELIEF Alabama Scour Critical — Countermeasures Installed Fair 1968 7,205
FLINT CREEK RELIEF Alabama Scour Critical — Countermeasures Installed Fair 1955 7,205
FLINT CREEK RELIEF Alabama Scour Critical — Countermeasures Installed Fair 1955 7,205
WEPAWAUG RIVER Connecticut Scour Critical — Countermeasures Installed Good 1936 7,200
GRANDE RIVER Puerto Rico Scour Critical — Countermeasures Installed Fair 1915 7,200
CULEBRINAS RIVER Puerto Rico Scour Critical — Countermeasures Installed Poor 1919 7,200
BULL CREEK Florida Scour Critical — Countermeasures Installed Good 1969 7,200
LOS JOBOS RIVER Puerto Rico Scour Critical — Countermeasures Installed Fair 1955 7,200
Otter Creek Pennsylvania Scour Critical — Countermeasures Installed Poor 1920 7,200
WATERWAY Puerto Rico Scour Critical — Countermeasures Installed Poor 1990 7,200
LACAMAS CREEK Washington Scour Critical — Countermeasures Installed Good 1933 7,195
YELLOW WATER RIVER Louisiana Scour Critical — Countermeasures Installed Poor 1958 7,190
BLACK RIVER Pennsylvania Scour Critical — Countermeasures Installed Fair 1938 7,182
CHAMBERS CREEK Tennessee Scour Critical — Countermeasures Installed Fair 1967 7,175
STILLWATER RIVER Montana Scour Critical — Countermeasures Installed Fair 1975 7,156
ARMSTRONG CREEK Michigan Scour Critical — Countermeasures Installed Good 1986 7,156
WEST EMMA CREEK Kansas Scour Critical — Countermeasures Installed Good 1970 7,140
WEST EMMA CREEK Kansas Scour Critical — Countermeasures Installed Good 1971 7,140
TICKFAW RIVER Louisiana Scour Critical — Countermeasures Installed Fair 1949 7,126
HOG BRANCH Louisiana Scour Critical — Countermeasures Installed Fair 1932 7,126
TRIB TO GLADE RUN Pennsylvania Scour Critical — Countermeasures Installed Fair 1961 7,106
MAPLE RIVER Michigan Scour Critical — Countermeasures Installed Fair 1929 7,103
ALDER CREEK Michigan Scour Critical — Countermeasures Installed Fair 1949 7,103
CARTER CREEK Wisconsin Scour Critical — Countermeasures Installed Fair 1937 7,100
Intracoastal Waterway Florida Scour Critical — Countermeasures Installed Poor 1963 7,100
CANDELERO RIVER Puerto Rico Scour Critical — Countermeasures Installed Fair 1926 7,100
WEEKI WACHEE RIVER Florida Scour Critical — Countermeasures Installed Good 1985 7,100
LITTLE SWIFT CREEK North Carolina Scour Critical — Countermeasures Installed Fair 1970 7,100
SANTIAGO CHANNEL Puerto Rico Scour Critical — Countermeasures Installed Poor 1946 7,100
WEST RIVER Connecticut Scour Critical — Countermeasures Installed Fair 1934 7,100
CARPENTERS BAYOU Texas Scour Critical — Countermeasures Installed Fair 1970 7,092
CROUSE RUN Pennsylvania Scour Critical — Countermeasures Installed Fair 1963 7,087
BIG CREEK Louisiana Scour Critical — Countermeasures Installed Fair 2007 7,084
OLD SLOUGH Louisiana Scour Critical — Countermeasures Installed Fair 2007 7,084
FISH CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1948 7,084

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