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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
ELM FORK TRINITY RIVER Texas Scour Critical — Unaddressed Poor 1986 10
Potholes East Canal Washington Scour Critical — Unaddressed Fair 1952 10
DRAINAGE Iowa Scour Critical — Unaddressed Poor 1930 9
Feeder Ditch Colorado Scour Critical — Unaddressed Poor 1970 7
WISE RIVER Montana Scour Critical — Unaddressed Poor 1992 6
TRIB TO ROUBIDOUX CRK Missouri Scour Critical — Unaddressed Poor 1960 5
NO DATA ENTERED Montana Scour Critical — Unaddressed Fair 1987 5
Mirage Flats Canal Nebraska Scour Critical — Unaddressed Fair 1945 5
AINSWORTH IRRIG CANAL Nebraska Scour Critical — Unaddressed Fair 1963 5
STREAM Nebraska Scour Critical — Unaddressed Poor 1935 5
JARVIS CREEK TRIBUTARY Nebraska Scour Critical — Unaddressed Poor 1935 5
COURTLAND CANAL Nebraska Scour Critical — Unaddressed Fair 1947 5
THAWES CREEK Nebraska Scour Critical — Unaddressed Fair 1947 5
PLUM CREEK Nebraska Scour Critical — Unaddressed Poor 1935 5
BIG CREEK Nebraska Scour Critical — Unaddressed Poor 1900 5
UNKNOWN CREEK New Mexico Scour Critical — Unaddressed Poor 1943 5
WHIPPING CREEK North Carolina Scour Critical — Unaddressed Poor 1965 5
BLACK ROCK CREEK Oregon Scour Critical — Unaddressed Poor 1973 5
CLEAR CREEK DRAW Texas Scour Critical — Unaddressed Fair 2013 5
Cambridge Canal Nebraska Scour Critical — Unaddressed Poor 1963 3
PLUMB BROOK New York Scour Critical — Unaddressed Fair 1985 3
Fork of Palo Duro Creek Texas Scour Critical — Unaddressed Fair 1960 3
STINKING FORK Indiana Scour Critical — Unaddressed Poor 1938 2
PAWNEE CREEK Nebraska Scour Critical — Unaddressed Poor 1935 2
MUDDY CREEK North Carolina Scour Critical — Unaddressed Good 1975 2
EASLY CREEK Nebraska Scour Critical — Unaddressed Poor 1935 1
ROCKFISH CREEK North Carolina Scour Critical — Unaddressed Poor 1960 1
PINEY BOTTOM CREEK North Carolina Scour Critical — Unaddressed Poor 1960 1
MUD CREEK Pennsylvania Scour Critical — Unaddressed Poor 1907 1
FIRST CREEK Alaska Scour Critical — Unaddressed Poor 1985 —
BOULDER CREEK California Scour Critical — Unaddressed Fair 1996 —
ARKANSAS RIVER Colorado Scour Critical — Unaddressed Poor 1908 —
POTTS RUN Pennsylvania Scour Critical — Unaddressed Poor 1905 —
CHIQUES CREEK Pennsylvania Scour Critical — Unaddressed Poor 1925 —
SALT RUN Pennsylvania Scour Critical — Unaddressed Poor 1929 —
Drainage Ditch Texas Scour Critical — Countermeasures Ineffective Good 2005 373,095
SPRING CR REL Texas Scour Critical — Countermeasures Ineffective Fair 1990 243,893
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Fair 1926 243,893
SPRING CR Texas Scour Critical — Countermeasures Ineffective Fair 1990 243,893
SPRING CR REL Texas Scour Critical — Countermeasures Ineffective Fair 1990 243,893
TIMBER CREEK Texas Scour Critical — Countermeasures Ineffective Good 2007 225,364
HCFCD CHANNEL A-119-06 Texas Scour Critical — Countermeasures Ineffective Fair 1994 224,891
DRAINAGE DITCH Texas Scour Critical — Countermeasures Ineffective Good 1998 215,954
SILVERDALE CRK Texas Scour Critical — Countermeasures Ineffective Good 2007 201,083
DRAIN Texas Scour Critical — Countermeasures Ineffective Good 2000 197,395
HCFCD DITCH A-119-05-00 Texas Scour Critical — Countermeasures Ineffective Fair 1994 196,996
Knights Branch Texas Scour Critical — Countermeasures Ineffective Fair 1959 194,462
HCFCD Ditch A119-02-00 Texas Scour Critical — Countermeasures Ineffective Good 2016 193,996
HCFCD Ditch A119-12-00 Texas Scour Critical — Countermeasures Ineffective Good 2015 193,665
HCFCD Ditch A119 13 00 Texas Scour Critical — Countermeasures Ineffective Good 2015 193,665

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