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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
CEDAR RIVER Nebraska Scour Critical — Unaddressed Poor 1979 470
UNNAMED CREEK Texas Scour Critical — Unaddressed Fair 2021 470
INDIAN RIVER New York Scour Critical — Unaddressed Poor 1930 460
S FK CROW RIVER Minnesota Scour Critical — Unaddressed Fair 1963 460
MINNESOTA RIVER Minnesota Scour Critical — Unaddressed Fair 1948 460
NOTTAWASSEPEE CREEK Michigan Scour Critical — Unaddressed Poor 1976 459
FURNACE CREEK Pennsylvania Scour Critical — Unaddressed Poor 1920 456
STREAM Minnesota Scour Critical — Unaddressed Fair 1963 445
SOUTH CREEK Minnesota Scour Critical — Unaddressed Poor 1971 435
LITTLE CANEY CREEK Kentucky Scour Critical — Unaddressed Poor 1966 425
WILLOW CREEK Pennsylvania Scour Critical — Unaddressed Poor 1934 424
BUCATUNNA RELIEF Mississippi Scour Critical — Unaddressed Poor 1981 410
East Amarillo Creek Texas Scour Critical — Unaddressed Fair 1964 405
SYCAMORE CREEK Oklahoma Scour Critical — Unaddressed Poor 1975 400
DRY BRANCH Texas Scour Critical — Unaddressed Fair 1947 400
GUAYANILLA RIVER Puerto Rico Scour Critical — Unaddressed Poor 1977 400
MIDDLE ROUGE RIVER Michigan Scour Critical — Unaddressed Poor 1945 400
OTTER TAIL RIVER Minnesota Scour Critical — Unaddressed Fair 1967 390
WATER DEAD BR WSTFLD RIV Massachusetts Scour Critical — Unaddressed Fair 1954 388
VIOLETTE BROOK Maine Scour Critical — Unaddressed Poor 1958 380
CREEK Oklahoma Scour Critical — Unaddressed Poor 1950 377
Drainage Ditch Texas Scour Critical — Unaddressed Poor 1920 376
THORN CREEK Idaho Scour Critical — Unaddressed Poor 1955 360
MUD CREEK Minnesota Scour Critical — Unaddressed Fair 1969 360
CANNONBALL RIVER North Dakota Scour Critical — Unaddressed Good 1990 355
PENNESSEEWASSEE STREAM Maine Scour Critical — Unaddressed Poor 1921 352
N FK LITTLE NEMAHA RIVER Nebraska Scour Critical — Unaddressed Poor 1935 350
TUCANNON RIVER Washington Scour Critical — Unaddressed Poor 1962 350
ANTIETAM CREEK Pennsylvania Scour Critical — Unaddressed Poor 1939 350
NORTH MYRTLE CREEK Oregon Scour Critical — Unaddressed Fair 1976 331
LITTLE CREEK California Scour Critical — Unaddressed Poor 1955 330
RED EYE RIVER Minnesota Scour Critical — Unaddressed Poor 1965 325
STREAM Nebraska Scour Critical — Unaddressed Poor 1949 325
WHITEOAK CREEK Tennessee Scour Critical — Unaddressed Poor 1959 323
N FK CROW RIVER Minnesota Scour Critical — Unaddressed Fair 1980 310
SALT CREEK California Scour Critical — Unaddressed Poor 1948 300
THOMPSON RUN CREEK Pennsylvania Scour Critical — Unaddressed Poor 1900 300
Pitts Mill Creek Florida Scour Critical — Unaddressed Poor 1963 300
CHEWELAH CREEK Washington Scour Critical — Unaddressed Poor 1935 300
NOAHS SPRING BRANCH Kentucky Scour Critical — Unaddressed Fair 2005 300
S BR YELLOW MEDICINE R Minnesota Scour Critical — Unaddressed Good 1970 295
PECAN CREEK Texas Scour Critical — Unaddressed Fair 1955 293
MOOSEHORN CREEK Maine Scour Critical — Unaddressed Poor 1951 291
NORTH BR TOBACCO RIVER Michigan Scour Critical — Unaddressed Poor 1939 280
WATONWAN RIVER Minnesota Scour Critical — Unaddressed Fair 1983 276
CANNON RIVER Minnesota Scour Critical — Unaddressed Fair 1975 276
CROW WING RIVER Minnesota Scour Critical — Unaddressed Fair 1967 276
NORTH FORK OBION RIVER Tennessee Scour Critical — Unaddressed Fair 1956 272
UNNAMED STREAM Mississippi Scour Critical — Unaddressed Fair 1937 270
COTTONWOOD CREEK Texas Scour Critical — Unaddressed Fair 1956 266

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