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 |
|---|---|---|---|---|---|
| NEDDY CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 2009 | 70 |
| Ouachita River Polk Co. | Arkansas | Scour Critical — Countermeasures Ineffective | Good | 1983 | 70 |
| MIDDLE CREEK | West Virginia | Scour Critical — Countermeasures Ineffective | Poor | 1979 | 70 |
| MAIN DITCH | Arkansas | Scour Critical — Countermeasures Ineffective | Fair | 2001 | 70 |
| BUFFALO BAYOU | Texas | Scour Critical — Countermeasures Ineffective | Fair | 2011 | 70 |
| CLEAR CREEK DRAW | Texas | Scour Critical — Countermeasures Ineffective | Fair | 2004 | 70 |
| CLEAR CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 2002 | 69 |
| Tanner Creek - Wash Co | Arkansas | Scour Critical — Countermeasures Ineffective | Good | 2024 | 69 |
| BLAINS CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 2014 | 69 |
| CASTLEMAN CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 1996 | 68 |
| PARADISE CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 2005 | 67 |
| GILBERT CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1962 | 67 |
| HONEY CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 2024 | 66 |
| BRANCH BRUSHY CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 2007 | 66 |
| S FK JUDITH RIVER | Montana | Scour Critical — Countermeasures Ineffective | Poor | 1958 | 65 |
| DRAINAGE DITCH | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1972 | 65 |
| FISH CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 1976 | 65 |
| POND CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 2009 | 64 |
| SOUTH FISH CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1982 | 64 |
| GAGES CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 2008 | 64 |
| COLEY CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1986 | 64 |
| EAST FORK POND CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 1996 | 63 |
| SAND CREEK | Utah | Scour Critical — Countermeasures Ineffective | Fair | 2024 | 63 |
| BRANCH BRUSHY CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1977 | 62 |
| LEON RIVER | Texas | Scour Critical — Countermeasures Ineffective | Good | 2007 | 62 |
| N FORK CHAMBERS CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1991 | 62 |
| RIO GRANDE RIVER | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1956 | 62 |
| COWSKIN CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1977 | 62 |
| HUFFSTUTTLE CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 1958 | 61 |
| ELM CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 1998 | 61 |
| IRRIGATION DITCH | Texas | Scour Critical — Countermeasures Ineffective | Good | 1996 | 61 |
| SPRING CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1996 | 60 |
| Old Town Creek | Alabama | Scour Critical — Countermeasures Ineffective | Good | 2019 | 60 |
| MATE CREEK | West Virginia | Scour Critical — Countermeasures Ineffective | Fair | 1990 | 60 |
| Nueces River | Texas | Scour Critical — Countermeasures Ineffective | Good | 2024 | 60 |
| DRAW | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1997 | 60 |
| WILBURN BRANCH | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1997 | 60 |
| DUCK CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1993 | 60 |
| DRAW | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1996 | 60 |
| BRANCH OF FARMERS CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1993 | 60 |
| HONDO CREEK | Texas | Scour Critical — Countermeasures Ineffective | Good | 2005 | 60 |
| WARING BRANCH | Texas | Scour Critical — Countermeasures Ineffective | Good | 1998 | 60 |
| DRAW | Texas | Scour Critical — Countermeasures Ineffective | Fair | 2005 | 60 |
| VILLAGE CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1993 | 60 |
| DRAINAGE DITCH | Texas | Scour Critical — Countermeasures Ineffective | Good | 2009 | 60 |
| Big Piney | Arkansas | Scour Critical — Countermeasures Ineffective | Poor | 1931 | 60 |
| POST OAK CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1961 | 60 |
| DRAW | Texas | Scour Critical — Countermeasures Ineffective | Fair | 2008 | 60 |
| DRAW | Texas | Scour Critical — Countermeasures Ineffective | Fair | 2006 | 60 |
| BRANCH BRUSHY CREEK | Texas | Scour Critical — Countermeasures Ineffective | Fair | 1968 | 59 |
Scour Critical Bridges by State
States ranked by number of scour critical bridges.
| State | Scour Critical | Unaddressed | Countermeasures | Ineffective |
|---|---|---|---|---|
| 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 — Unaddressed | Bridge is scour critical with no countermeasures installed. The foundation is vulnerable and no protective action has been taken. |
| Code 3 — Countermeasures Installed | Protective measures (riprap, sheet piling, etc.) have been installed to reduce scour risk, but the bridge remains classified as scour critical. |
| Code 6 — Countermeasures Ineffective | Protective 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.