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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
BIG EAGLE CREEK Indiana Scour Critical — Unaddressed Poor 1970 38,589
BLACK LAKE CREEK Louisiana Scour Critical — Unaddressed Fair 1964 37,514
BLACK LAKE CREEK Louisiana Scour Critical — Unaddressed Fair 1964 37,514
TALLABOA RIVER Puerto Rico Scour Critical — Unaddressed Poor 1968 33,800
HUEBNER CREEK Texas Scour Critical — Unaddressed Fair 1990 31,680
HUMACAO RIVER Puerto Rico Scour Critical — Unaddressed Poor 1985 29,200
HENRIETTA CR Texas Scour Critical — Unaddressed Poor 1930 27,805
DOE RIVER Tennessee Scour Critical — Unaddressed Poor 1929 22,653
Draw Texas Scour Critical — Unaddressed Fair 1997 21,396
WATER CHARLES RIVER Massachusetts Scour Critical — Unaddressed Fair 1929 20,800
BRAZOS RIVER Texas Scour Critical — Unaddressed Poor 1994 18,866
TRANCAS CREEK California Scour Critical — Unaddressed Poor 1927 17,100
YELLOW HOUSE DRAW Texas Scour Critical — Unaddressed Fair 1954 14,629
WATER MILLERS RIVER Massachusetts Scour Critical — Unaddressed Fair 1932 14,094
WHITE ROCK CREEK Texas Scour Critical — Unaddressed Poor 1974 14,029
WATER CONCORD RIVER Massachusetts Scour Critical — Unaddressed Fair 1850 13,300
ATCHAF.R/BERWICK BAY Louisiana Scour Critical — Unaddressed Poor 1933 12,788
WHITE BAYOU Louisiana Scour Critical — Unaddressed Poor 1951 11,198
JAMES RIVER North Dakota Scour Critical — Unaddressed Fair 1933 10,370
NOOKSACK R OVERFLOW Washington Scour Critical — Unaddressed Poor 1994 10,205
WATER SUDBURY RIVER Massachusetts Scour Critical — Unaddressed Fair 1874 10,086
MIDDLE FORK FEATHER RIV California Scour Critical — Unaddressed Poor 1954 10,046
WAX LAKE OUTLET Louisiana Scour Critical — Unaddressed Poor 1975 10,035
BIG BRANCH Louisiana Scour Critical — Unaddressed Fair 1932 9,941
Mountain Creek Texas Scour Critical — Unaddressed Fair 1967 9,569
UTUADO CREEK Puerto Rico Scour Critical — Unaddressed Poor 1965 9,000
LIT NATALBANY R. Louisiana Scour Critical — Unaddressed Good 1950 8,928
RIO AIBONITO Puerto Rico Scour Critical — Unaddressed Poor 2010 8,900
LITTLE NOLAN CREEK Texas Scour Critical — Unaddressed Fair 1939 8,887
WATER QUABOAG RIVER Massachusetts Scour Critical — Unaddressed Fair 1948 7,200
NAVASOTA RIVER Texas Scour Critical — Unaddressed Fair 1940 7,027
VENTURA RIVER California Scour Critical — Unaddressed Poor 1932 6,853
CHANNEL BETW LAKE & RIVR Michigan Scour Critical — Unaddressed Poor 1974 6,400
BR. MANATAWNY CREEK Pennsylvania Scour Critical — Unaddressed Poor 1964 6,195
WATER SPICKET RIVER Massachusetts Scour Critical — Unaddressed Fair 1959 5,300
BOGUE LUSA CREEK Louisiana Scour Critical — Unaddressed Fair 1950 5,213
Rocky Creek Texas Scour Critical — Unaddressed Poor 1958 5,088
WILLIAMS CREEK Texas Scour Critical — Unaddressed Poor 1931 5,085
MCKIM CREEK Texas Scour Critical — Unaddressed Poor 1964 4,992
CROW RIVER Minnesota Scour Critical — Unaddressed Fair 1973 4,800
DRAW Texas Scour Critical — Unaddressed Fair 1942 4,757
MOUNTAIN RUN CREEK Pennsylvania Scour Critical — Unaddressed Poor 1916 4,717
SPRING CREEK Texas Scour Critical — Unaddressed Poor 1964 4,698
BURNS DITCH (DEEP RIVER) Indiana Scour Critical — Unaddressed Poor 1970 4,635
Cottonwood Creek Texas Scour Critical — Unaddressed Poor 1926 4,614
LOGAN RIVER Utah Scour Critical — Unaddressed Poor 1983 4,505
N BR WEEPING WATER CK TR Nebraska Scour Critical — Unaddressed Poor 1953 4,360
STONEY RUN Maryland Scour Critical — Unaddressed Poor 1900 4,280
PASS MANCHAC Louisiana Scour Critical — Unaddressed Poor 1957 4,107
COON BRANCH Nebraska Scour Critical — Unaddressed Poor 1933 4,055

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