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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
HULEIA STRM Hawaii Scour Critical — Countermeasures Installed Good 1989 26,700
PLATTE RVR Missouri Scour Critical — Countermeasures Installed Poor 1959 26,656
PLATTE RVR OVRFL Missouri Scour Critical — Countermeasures Installed Fair 1959 26,656
ROBINSON BR RAHWAY RIVER New Jersey Scour Critical — Countermeasures Installed Fair 1867 26,650
TITTABAWASSEE RIVER Michigan Scour Critical — Countermeasures Installed Fair 1954 26,627
AMBROSE BROOK New Jersey Scour Critical — Countermeasures Installed Fair 1938 26,546
MULBERRY CREEK Georgia Scour Critical — Countermeasures Installed Good 1978 26,500
LOTTS CREEK Georgia Scour Critical — Countermeasures Installed Fair 1976 26,500
MISS RVR RR & IA 461 Iowa Scour Critical — Countermeasures Installed Poor 1940 26,500
BAYAMON RIVER Puerto Rico Scour Critical — Countermeasures Installed Fair 1962 26,400
PIKE RUN New Jersey Scour Critical — Countermeasures Installed Fair 1927 26,391
PERRIS VALLEY STORM DRN California Scour Critical — Countermeasures Installed Good 1956 26,340
BRONX RIVER New York Scour Critical — Countermeasures Installed Fair 1923 26,325
CROWS RUN Pennsylvania Scour Critical — Countermeasures Installed Fair 1900 26,289
W. FK. FLETCHER CREEK Tennessee Scour Critical — Countermeasures Installed Fair 1983 26,269
C-13 CANAL Florida Scour Critical — Countermeasures Installed Fair 1964 26,260
Howard Creek Florida Scour Critical — Countermeasures Installed Good 1936 26,250
CHEHALIS RIVER Washington Scour Critical — Countermeasures Installed Poor 1955 26,216
FARMINGTON RIVER Connecticut Scour Critical — Countermeasures Installed Fair 1996 26,100
WATER MERRIMACK RIVER Massachusetts Scour Critical — Countermeasures Installed Fair 1883 26,000
NORTH TURKEY CREEK Colorado Scour Critical — Countermeasures Installed Fair 1948 26,000
UPRR;INDIAN CR;CALDWELL Idaho Scour Critical — Countermeasures Installed Fair 1983 26,000
CASS RIVER Michigan Scour Critical — Countermeasures Installed Fair 1961 25,971
LEWIS RUN Pennsylvania Scour Critical — Countermeasures Installed Fair 1958 25,938
HUNT RIVER Rhode Island Scour Critical — Countermeasures Installed Fair 1930 25,883
W CHANNEL SAGINAW RIVER Michigan Scour Critical — Countermeasures Installed Fair 1938 25,874
MERRIMACK RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1959 25,855
MISSISSIPPI RIVER Illinois Scour Critical — Countermeasures Installed Fair 1986 25,850
MISSISSIPPI RIVER Illinois Scour Critical — Countermeasures Installed Fair 1984 25,850
MERRIMACK RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1959 25,801
INDIAN FIELD SWAMP South Carolina Scour Critical — Countermeasures Installed Fair 1972 25,800
INDIAN FIELD SWAMP South Carolina Scour Critical — Countermeasures Installed Fair 1972 25,800
CUCKLES BROOK New Jersey Scour Critical — Countermeasures Installed Poor 1962 25,789
REYNOLDS CHANNEL New York Scour Critical — Countermeasures Installed Fair 1934 25,774
BIG WHITE LICK CREEK Indiana Scour Critical — Countermeasures Installed Good 1959 25,764
BUFFALO BAYOU/ ZOLTOWSKI Texas Scour Critical — Countermeasures Installed Poor 1956 25,730
ROUGE RIVER Michigan Scour Critical — Countermeasures Installed Fair 1931 25,704
ROUGE RIVER Michigan Scour Critical — Countermeasures Installed Good 1987 25,704
TEN MILE CREEK Texas Scour Critical — Countermeasures Installed Fair 1996 25,686
WACCAMAW RIVER South Carolina Scour Critical — Countermeasures Installed Poor 1966 25,600
SWARTZ CREEK Michigan Scour Critical — Countermeasures Installed Fair 1968 25,506
SWARTZ CREEK Michigan Scour Critical — Countermeasures Installed Fair 1968 25,506
PECONIC RIVER New York Scour Critical — Countermeasures Installed Fair 1975 25,454
OVERFLOW CHANNEL Washington Scour Critical — Countermeasures Installed Fair 1960 25,406
OVERFLOW CHANNEL Washington Scour Critical — Countermeasures Installed Fair 1960 25,406
Little River Canal (C-7) Florida Scour Critical — Countermeasures Installed Fair 1964 25,364
CROSSWICKS CREEK New Jersey Scour Critical — Countermeasures Installed Fair 1928 25,346
TAYLOR BROOK New Jersey Scour Critical — Countermeasures Installed Fair 1964 25,296
CANOE BROOK New Jersey Scour Critical — Countermeasures Installed Fair 1964 25,296
RAHWAY RIVER New Jersey Scour Critical — Countermeasures Installed Poor 1875 25,292

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