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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
PLASTER CREEK Michigan Scour Critical — Countermeasures Installed Fair 1916 16,531
TCHEFUNCTE R/MADISONVILL Louisiana Scour Critical — Countermeasures Installed Fair 1980 16,517
BADGER WASH California Scour Critical — Countermeasures Installed Fair 1972 16,500
MOORING BAY Florida Scour Critical — Countermeasures Installed Good 1957 16,500
SANDY RIVER Oregon Scour Critical — Countermeasures Installed Fair 1964 16,500
BOISE RIVER Idaho Scour Critical — Countermeasures Installed Fair 1931 16,500
KAALAEA STRM Hawaii Scour Critical — Countermeasures Installed Fair 1923 16,500
TRUCKEE RIVER Nevada Scour Critical — Countermeasures Installed Fair 1962 16,500
TRUCKEE RIVER Nevada Scour Critical — Countermeasures Installed Fair 1962 16,500
MILL CREEK Pennsylvania Scour Critical — Countermeasures Installed Fair 1930 16,498
HOOD RIVER Oregon Scour Critical — Countermeasures Installed Fair 1953 16,493
HOOD RIVER Oregon Scour Critical — Countermeasures Installed Fair 1962 16,493
Deer Creek Oregon Scour Critical — Countermeasures Installed Fair 1941 16,492
South Yamhill River Oregon Scour Critical — Countermeasures Installed Fair 1946 16,482
S. DOMINGO CREEK ROAD Puerto Rico Scour Critical — Countermeasures Installed Good 1974 16,450
BR PACOCK BRK & NYS&W RR New Jersey Scour Critical — Countermeasures Installed Fair 1931 16,440
TIMBER CRK Texas Scour Critical — Countermeasures Installed Fair 1950 16,436
COLORADO RIVER Colorado Scour Critical — Countermeasures Installed Fair 1976 16,434
WATER MILL RIVER Massachusetts Scour Critical — Countermeasures Installed Fair 1947 16,422
LOOSAHATCHIE RIVER Tennessee Scour Critical — Countermeasures Installed Fair 1977 16,419
INDIAN CR DRAINAGE CANAL Tennessee Scour Critical — Countermeasures Installed Poor 1924 16,405
BRANCH Tennessee Scour Critical — Countermeasures Installed Poor 1926 16,405
RACCOON CREEK New Jersey Scour Critical — Countermeasures Installed Fair 1928 16,401
MEANS BROOK Connecticut Scour Critical — Countermeasures Installed Fair 1925 16,400
PAWCATUCK RIVER Connecticut Scour Critical — Countermeasures Installed Poor 1932 16,400
RACCOON CREEK New Jersey Scour Critical — Countermeasures Installed Good 1940 16,400
RED CEDAR RIVER Michigan Scour Critical — Countermeasures Installed Fair 1926 16,395
SNOHOMISH R. Washington Scour Critical — Countermeasures Installed Good 1983 16,383
E CHANNEL SAGINAW RIVER Michigan Scour Critical — Countermeasures Installed Poor 1938 16,380
BLACK SWAMP (NO. 3) South Carolina Scour Critical — Countermeasures Installed Fair 1968 16,300
BRANFORD RIVER Connecticut Scour Critical — Countermeasures Installed Fair 1930 16,300
BLACK RIVER (NO. 2) South Carolina Scour Critical — Countermeasures Installed Fair 1968 16,300
BLACK SWAMP (NO. 5) South Carolina Scour Critical — Countermeasures Installed Fair 1968 16,300
BLACK SWAMP (NO. 5) South Carolina Scour Critical — Countermeasures Installed Fair 1968 16,300
WATER SALISBURY BROOK Massachusetts Scour Critical — Countermeasures Installed Good 1889 16,300
TEARCOAT BRANCH South Carolina Scour Critical — Countermeasures Installed Fair 1967 16,300
TEARCOAT BRANCH South Carolina Scour Critical — Countermeasures Installed Fair 1967 16,300
SNOHOMISH RIVER Washington Scour Critical — Countermeasures Installed Poor 1954 16,286
Muddy Creek Oregon Scour Critical — Countermeasures Installed Fair 1978 16,258
THORNAPPLE RIVER Michigan Scour Critical — Countermeasures Installed Fair 1961 16,253
THORNAPPLE RIVER Michigan Scour Critical — Countermeasures Installed Fair 1961 16,253
BLUE RIVER BLUE ROAD Indiana Scour Critical — Countermeasures Installed Fair 1974 16,250
STONEY CREEK North Carolina Scour Critical — Countermeasures Installed Fair 1966 16,250
BLUE RIVER BLUE ROAD Indiana Scour Critical — Countermeasures Installed Fair 1974 16,250
BEAL-TAYLOR DITCH Indiana Scour Critical — Countermeasures Installed Good 1987 16,231
CAMARONES CREEK Puerto Rico Scour Critical — Countermeasures Installed Fair 1921 16,200
PHILLIPPI CREEK Florida Scour Critical — Countermeasures Installed Good 1976 16,200
THUNDER BAY RIVER Michigan Scour Critical — Countermeasures Installed Fair 1932 16,200
LETTS DRAIN Michigan Scour Critical — Countermeasures Installed Fair 1951 16,199
PRAIRIE CREEK Michigan Scour Critical — Countermeasures Installed Fair 1938 16,168

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