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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
Canal C-103 Florida Scour Critical — Countermeasures Installed Good 1966 20,850
BEAR CR Oregon Scour Critical — Countermeasures Installed Fair 1961 20,832
BEAR CR Oregon Scour Critical — Countermeasures Installed Good 1961 20,832
BEAR CR Oregon Scour Critical — Countermeasures Installed Good 1962 20,818
BEAR CR Oregon Scour Critical — Countermeasures Installed Good 1962 20,818
ROUGE RIVER Michigan Scour Critical — Countermeasures Installed Fair 1966 20,809
THREAD CREEK Michigan Scour Critical — Countermeasures Installed Poor 1976 20,772
BLUE LICK CREEK Indiana Scour Critical — Countermeasures Installed Fair 1958 20,765
BLUE LICK CREEK Indiana Scour Critical — Countermeasures Installed Fair 1958 20,765
MALIBU CRK California Scour Critical — Countermeasures Installed Poor 1953 20,753
CHOPAWAMSIC CREEK Virginia Scour Critical — Countermeasures Installed Poor 1933 20,738
BONGERS CREEK Wisconsin Scour Critical — Countermeasures Installed Fair 1936 20,705
Little Muddy Creek Oregon Scour Critical — Countermeasures Installed Fair 1958 20,693
Little Muddy Creek Oregon Scour Critical — Countermeasures Installed Fair 1958 20,693
Muddy Creek Oregon Scour Critical — Countermeasures Installed Fair 1959 20,693
Muddy Creek Oregon Scour Critical — Countermeasures Installed Fair 1959 20,693
MOLASSES CREEK Pennsylvania Scour Critical — Countermeasures Installed Fair 1955 20,666
LAWAI STRM Hawaii Scour Critical — Countermeasures Installed Fair 1934 20,600
DIVERSION CANAL Louisiana Scour Critical — Countermeasures Installed Good 1989 20,572
SABANA RIVER Puerto Rico Scour Critical — Countermeasures Installed Poor 1944 20,500
New River & New River Dr Florida Scour Critical — Countermeasures Installed Good 1981 20,500
CATAWBA RIVER North Carolina Scour Critical — Countermeasures Installed Fair 1961 20,500
SAN ANTONIO CREEK California Scour Critical — Countermeasures Installed Poor 1936 20,500
PEAVINE CREEK Georgia Scour Critical — Countermeasures Installed Good 1969 20,500
COLUMBIA R @ LONGVIEW Washington Scour Critical — Countermeasures Installed Fair 1929 20,432
SLAB CABIN RUN Pennsylvania Scour Critical — Countermeasures Installed Fair 1932 20,393
Cave Creek Arizona Scour Critical — Countermeasures Installed Fair 1958 20,381
PEQUANNOCK RIVER New Jersey Scour Critical — Countermeasures Installed Fair 1952 20,321
CHINQUAPIN RUN Maryland Scour Critical — Countermeasures Installed Fair 1932 20,285
ROGUE RIVER Michigan Scour Critical — Countermeasures Installed Fair 1929 20,285
CHINQUAPIN RUN Maryland Scour Critical — Countermeasures Installed Fair 1932 20,285
SPARKILL CREEK New York Scour Critical — Countermeasures Installed Fair 1932 20,253
FORSYTHE CREEK California Scour Critical — Countermeasures Installed Fair 1949 20,200
Hess Creek Oregon Scour Critical — Countermeasures Installed Fair 1958 20,200
BIG TIMBER CREEK New Jersey Scour Critical — Countermeasures Installed Poor 1928 20,155
LITTLE CONESTOGA CREEK Pennsylvania Scour Critical — Countermeasures Installed Fair 1927 20,141
ROCK CREEK Oregon Scour Critical — Countermeasures Installed Good 1985 20,132
CONNECTICUT RIVER NECRR Vermont Scour Critical — Countermeasures Installed Poor 1966 20,105
RED CLAY CREEK & RR Delaware Scour Critical — Countermeasures Installed Fair 1940 20,030
RED CLAY CREEK & RR Delaware Scour Critical — Countermeasures Installed Fair 1940 20,030
NOLANDS FORK Indiana Scour Critical — Countermeasures Installed Good 1959 20,025
GREENS FORK Indiana Scour Critical — Countermeasures Installed Fair 1962 20,025
GREENS FORK Indiana Scour Critical — Countermeasures Installed Fair 1962 20,025
BIG COTTONWOOD CREEK Utah Scour Critical — Countermeasures Installed Poor 1936 20,009
PLUMMER SLOUGH Mississippi Scour Critical — Countermeasures Installed Poor 1981 20,000
DRY CREEK CANAL California Scour Critical — Countermeasures Installed Fair 1954 19,941
E BR PAW PAW RIVER Michigan Scour Critical — Countermeasures Installed Fair 1960 19,936
UPPER ROUGE RIVER Michigan Scour Critical — Countermeasures Installed Fair 1930 19,931
COCAL RIVER Puerto Rico Scour Critical — Countermeasures Installed Fair 1945 19,900
DEN BROOK New Jersey Scour Critical — Countermeasures Installed Fair 1900 19,890

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