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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
MELAGA CANAL Florida Scour Critical — Countermeasures Installed Good 1963 40,500
PLATO CANAL Florida Scour Critical — Countermeasures Installed Good 1963 40,500
BEAR CREEK Florida Scour Critical — Countermeasures Installed Good 1995 40,500
TONQUISH CREEK Michigan Scour Critical — Countermeasures Installed Poor 1958 40,380
WHITE RIVER & WALKWAY Indiana Scour Critical — Countermeasures Installed Good 1992 40,154
Cave Creek Arizona Scour Critical — Countermeasures Installed Fair 1965 40,125
SAN GABRIEL RIVER California Scour Critical — Countermeasures Installed Fair 1966 40,000
PONCHATOULA CR. Louisiana Scour Critical — Countermeasures Installed Good 1960 39,850
PASS MANCHAC Louisiana Scour Critical — Countermeasures Installed Fair 1977 39,850
TOBESOFKEE CREEK Georgia Scour Critical — Countermeasures Installed Good 1970 39,800
WHITEWATER RIVER California Scour Critical — Countermeasures Installed Fair 1952 39,500
WHITEWATER RIVER California Scour Critical — Countermeasures Installed Fair 1952 39,500
MINN RIVER; TRAIL Minnesota Scour Critical — Countermeasures Installed Fair 1976 39,000
CYPRESS CREEK Texas Scour Critical — Countermeasures Installed Fair 1976 38,984
WILLAMETTE R & RIVER AVE Oregon Scour Critical — Countermeasures Installed Fair 1961 38,885
WILLAMETTE R & RIVER AVE Oregon Scour Critical — Countermeasures Installed Fair 1967 38,885
WALNUT CREEK Georgia Scour Critical — Countermeasures Installed Good 1967 38,700
PLUM CREEK Pennsylvania Scour Critical — Countermeasures Installed Poor 1952 38,689
DORCHEAT BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1960 38,625
HILLSBOROUGH RIVER Florida Scour Critical — Countermeasures Installed Fair 1961 38,500
CLEAR CREEK Colorado Scour Critical — Countermeasures Installed Fair 1941 38,000
CALOOSAHATCHEE RIVER Florida Scour Critical — Countermeasures Installed Good 1989 37,960
CALOOSAHATCHEE RIVER Florida Scour Critical — Countermeasures Installed Fair 1963 37,957
PASSAIC RIVER New Jersey Scour Critical — Countermeasures Installed Fair 1916 37,925
YANTIC RIVER NEC RR Connecticut Scour Critical — Countermeasures Installed Fair 1958 37,800
NIGUA RIVER Puerto Rico Scour Critical — Countermeasures Installed Fair 1971 37,800
EVANS CREEK Oregon Scour Critical — Countermeasures Installed Fair 1961 37,706
WARD CREEK Oregon Scour Critical — Countermeasures Installed Fair 1962 37,706
WOLF CREEK Tennessee Scour Critical — Countermeasures Installed Fair 1966 37,703
WOLF CREEK Tennessee Scour Critical — Countermeasures Installed Fair 1966 37,703
Indian Bend Wash Arizona Scour Critical — Countermeasures Installed Poor 1976 37,601
MERAMEC RVR SOUTH OUTER Missouri Scour Critical — Countermeasures Installed Poor 1968 37,539
CROWS CR RELIEF Louisiana Scour Critical — Countermeasures Installed Fair 1960 37,514
CROWS CR RELIEF Louisiana Scour Critical — Countermeasures Installed Poor 1960 37,514
OLEARY CREEK California Scour Critical — Countermeasures Installed Fair 1966 37,500
SHEM CREEK South Carolina Scour Critical — Countermeasures Installed Poor 1947 37,500
CROSSKILL CREEK Pennsylvania Scour Critical — Countermeasures Installed Fair 1929 37,481
MDOT RR COR & HURON RVR Michigan Scour Critical — Countermeasures Installed Fair 1962 37,373
MDOT RR COR & HURON RVR Michigan Scour Critical — Countermeasures Installed Fair 1962 37,373
WEST COLYELL CR Louisiana Scour Critical — Countermeasures Installed Fair 1970 37,161
NATALBANY RIVER Louisiana Scour Critical — Countermeasures Installed Fair 1970 37,140
ROCKWAY RIVER New Jersey Scour Critical — Countermeasures Installed Poor 1900 37,033
ST. JOHNS RIVER/HIGHLAND Florida Scour Critical — Countermeasures Installed Fair 1967 37,000
CLEAR CREEK Colorado Scour Critical — Countermeasures Installed Fair 1953 37,000
CLEAR BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1962 36,841
YELLOW BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1962 36,841
DRY BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1962 36,841
INDIAN BAYOU Louisiana Scour Critical — Countermeasures Installed Fair 1962 36,841
LANGHAM CREEK Texas Scour Critical — Countermeasures Installed Good 2005 36,822
BIG FIERY GIZZARD CREEK Tennessee Scour Critical — Countermeasures Installed Fair 1963 36,821

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