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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
BRANCH Tennessee Scour Critical — Countermeasures Installed Fair 1966 4,351
SPRING CREEK Tennessee Scour Critical — Countermeasures Installed Poor 1949 4,351
Sutton Creek Oregon Scour Critical — Countermeasures Installed Fair 1930 4,351
TRACE CREEK Tennessee Scour Critical — Countermeasures Installed Poor 1935 4,347
BEAVER CREEK Pennsylvania Scour Critical — Countermeasures Installed Fair 1929 4,342
PINE RUN Pennsylvania Scour Critical — Countermeasures Installed Fair 1966 4,342
W BR MUSKEGON RIVER Michigan Scour Critical — Countermeasures Installed Fair 1931 4,338
WEST BRANCH CROTON RIVER New York Scour Critical — Countermeasures Installed Good 2023 4,333
ZARZAMORA CREEK Texas Scour Critical — Countermeasures Installed Fair 1988 4,328
FARMERS HIGHLINE CANAL Colorado Scour Critical — Countermeasures Installed Fair 1959 4,326
DUGDEMONA RIVER RELIEF Louisiana Scour Critical — Countermeasures Installed Good 1996 4,317
Creek Oregon Scour Critical — Countermeasures Installed Fair 1954 4,311
NEOSHO RIVER &LOCAL RD Kansas Scour Critical — Countermeasures Installed Good 1984 4,309
Stronghold Wash Arizona Scour Critical — Countermeasures Installed Fair 1933 4,308
Dry Wash Arizona Scour Critical — Countermeasures Installed Fair 1933 4,308
OVERFLOW Tennessee Scour Critical — Countermeasures Installed Fair 1983 4,305
JACKSON CREEK New York Scour Critical — Countermeasures Installed Poor 1931 4,302
BR ROOT RIVER Wisconsin Scour Critical — Countermeasures Installed Fair 1959 4,300
TOWN CREEK South Carolina Scour Critical — Countermeasures Installed Fair 1974 4,300
FROHAWK CREEK South Carolina Scour Critical — Countermeasures Installed Fair 1962 4,300
MANISTIQUE RIVER Michigan Scour Critical — Countermeasures Installed Fair 1983 4,300
TRIB TO S TYGER South Carolina Scour Critical — Countermeasures Installed Fair 1975 4,300
ABBOTT RUN Rhode Island Scour Critical — Countermeasures Installed Good 2020 4,300
USABON RIVER Puerto Rico Scour Critical — Countermeasures Installed Fair 1908 4,300
SONOMA CREEK California Scour Critical — Countermeasures Installed Fair 1954 4,300
SEWICKLEY CREEK Pennsylvania Scour Critical — Countermeasures Installed Fair 1987 4,300
SPRUCE SWAMP CREEK Connecticut Scour Critical — Countermeasures Installed Fair 1928 4,300
SAN JOAQUIN RIVER California Scour Critical — Countermeasures Installed Good 1952 4,300
HONOKAHUA STRM Hawaii Scour Critical — Countermeasures Installed Good 1986 4,300
QUINEBAUG RIVER & CANAL Connecticut Scour Critical — Countermeasures Installed Fair 1959 4,300
BOGGY BAYOU Louisiana Scour Critical — Countermeasures Installed Poor 1969 4,294
Three Rivers Oregon Scour Critical — Countermeasures Installed Fair 1949 4,294
BOGGY BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1969 4,294
BUCHANAN BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1969 4,294
CREEK Louisiana Scour Critical — Countermeasures Installed Fair 1969 4,294
FOSTORIA DRAIN Michigan Scour Critical — Countermeasures Installed Poor 1974 4,293
RAYMPH DRAIN Michigan Scour Critical — Countermeasures Installed Fair 1940 4,293
ATTOYAC RIVER Texas Scour Critical — Countermeasures Installed Fair 1934 4,292
SALMON CR Washington Scour Critical — Countermeasures Installed Fair 1929 4,290
ROARING BROOK Pennsylvania Scour Critical — Countermeasures Installed Poor 1958 4,290
ARKANSAS RIVER Kansas Scour Critical — Countermeasures Installed Good 1930 4,289
ARKANSAS RIVER DRAINAGE Kansas Scour Critical — Countermeasures Installed Fair 1984 4,289
LITTLE WABASH RIVER Indiana Scour Critical — Countermeasures Installed Poor 1950 4,288
ROBINSON BRANCH Indiana Scour Critical — Countermeasures Installed Fair 1949 4,275
PASS CREEK Oregon Scour Critical — Countermeasures Installed Fair 1981 4,275
MILL STREAM Maine Scour Critical — Countermeasures Installed Fair 1959 4,273
MILL STREAM Maine Scour Critical — Countermeasures Installed Fair 1959 4,273
SILVER CREEK Oregon Scour Critical — Countermeasures Installed Fair 1969 4,272
Bogue Creek Relief Alabama Scour Critical — Countermeasures Installed Fair 1928 4,271
WATER E TEMPLTN PND OTLT Massachusetts Scour Critical — Countermeasures Installed Fair 1938 4,267

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