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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
Swatara Creek Pennsylvania Scour Critical — Countermeasures Installed Fair 1967 13,843
EB BLACK RIV E. BROAD ST Ohio Scour Critical — Countermeasures Installed Fair 1907 13,842
SHIAWASSEE RIVER Michigan Scour Critical — Countermeasures Installed Fair 1961 13,840
SHIAWASSEE RIVER Michigan Scour Critical — Countermeasures Installed Fair 1961 13,840
FLINT RIVER Michigan Scour Critical — Countermeasures Installed Fair 1974 13,821
STONY CREEK Pennsylvania Scour Critical — Countermeasures Installed Fair 1950 13,812
REPUBLICAN RIVER Kansas Scour Critical — Countermeasures Installed Poor 1985 13,800
ST. JOHNS RIVER Florida Scour Critical — Countermeasures Installed Fair 1941 13,800
TANAMA RIVER Puerto Rico Scour Critical — Countermeasures Installed Fair 1978 13,800
BLACKSTONE RIVER Rhode Island Scour Critical — Countermeasures Installed Fair 1979 13,800
DRAINAGE DITCH Texas Scour Critical — Countermeasures Installed Fair 1937 13,798
SINKING CREEK Pennsylvania Scour Critical — Countermeasures Installed Fair 1930 13,783
LINCOLN CREEK Wisconsin Scour Critical — Countermeasures Installed Fair 1936 13,774
Drift Creek Oregon Scour Critical — Countermeasures Installed Fair 1945 13,759
COBBS CREEK Pennsylvania Scour Critical — Countermeasures Installed Poor 1937 13,750
INDIAN LAKE New Jersey Scour Critical — Countermeasures Installed Fair 1959 13,750
BOGGS POND BROOK Connecticut Scour Critical — Countermeasures Installed Fair 1911 13,740
SCHOOL BR Texas Scour Critical — Countermeasures Installed Fair 1982 13,715
LITTLE RIVER Connecticut Scour Critical — Countermeasures Installed Fair 1933 13,700
LITTLE RIVER Connecticut Scour Critical — Countermeasures Installed Fair 1933 13,700
HAW CREEK Indiana Scour Critical — Countermeasures Installed Fair 1940 13,675
BARTON RUN New Jersey Scour Critical — Countermeasures Installed Fair 1965 13,672
RARITAN RIVER New Jersey Scour Critical — Countermeasures Installed Fair 1875 13,656
SAND CREEK Colorado Scour Critical — Countermeasures Installed Fair 1970 13,644
FALL CREEK Indiana Scour Critical — Countermeasures Installed Fair 1993 13,631
LITTLE DUCK CREEK Delaware Scour Critical — Countermeasures Installed Fair 1934 13,624
LEIPSIC RIVER Delaware Scour Critical — Countermeasures Installed Fair 1929 13,623
NORTH FORK CANE CREEK Tennessee Scour Critical — Countermeasures Installed Fair 1963 13,622
NORTH FORK CANE CREEK Tennessee Scour Critical — Countermeasures Installed Fair 1963 13,622
KAPUE STRM Hawaii Scour Critical — Countermeasures Installed Fair 1950 13,600
CHUCKWALLA WASH California Scour Critical — Countermeasures Installed Fair 2007 13,600
CRESTVIEW WASH California Scour Critical — Countermeasures Installed Fair 1971 13,600
HOMER WASH California Scour Critical — Countermeasures Installed Fair 1971 13,600
FORD RIVER Michigan Scour Critical — Countermeasures Installed Fair 1941 13,600
CHUCKWALLA WASH California Scour Critical — Countermeasures Installed Fair 2007 13,600
HOMER WASH California Scour Critical — Countermeasures Installed Fair 1971 13,600
ASH CREEK Texas Scour Critical — Countermeasures Installed Good 1997 13,591
ST JOSEPH RIVER Indiana Scour Critical — Countermeasures Installed Fair 1988 13,550
WHIPPANY RIVER New Jersey Scour Critical — Countermeasures Installed Fair 1950 13,541
MILL CREEK / 3374-B1 Pennsylvania Scour Critical — Countermeasures Installed Fair 1979 13,531
COUNTY RD MISSISSIPPI Missouri Scour Critical — Countermeasures Installed Fair 1975 13,521
TEN MILE CREEK Texas Scour Critical — Countermeasures Installed Poor 1966 13,520
WILDCAT CREEK South Carolina Scour Critical — Countermeasures Installed Fair 1968 13,500
WATER MYSTIC RIVER Massachusetts Scour Critical — Countermeasures Installed Poor 1926 13,500
Shingle Creek Trib. Florida Scour Critical — Countermeasures Installed Fair 1983 13,500
N FORK BLACK CREEK Florida Scour Critical — Countermeasures Installed Fair 1948 13,500
ALAMO PINTADO CREEK California Scour Critical — Countermeasures Installed Fair 1954 13,500
ARROYO DE LA LAGUNA California Scour Critical — Countermeasures Installed Good 1939 13,500
BR OF BLACK RIVER Michigan Scour Critical — Countermeasures Installed Fair 1955 13,496
BR OF BLACK RIVER Michigan Scour Critical — Countermeasures Installed Fair 1955 13,496

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