Scour Critical Bridges in Oregon
1,231 bridges in Oregon 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 1,231 bridges in Oregon have been identified as vulnerable to scour damage.
| Bridge | State | Scour Status | Condition | Year Built | ADT |
|---|---|---|---|---|---|
| MALHEUR RIVER | Oregon | Scour Critical — Countermeasures Installed | Fair | 1961 | 1,037 |
| KANE CR/KANE CR. RD. | Oregon | Scour Critical — Countermeasures Installed | Fair | 1967 | 1,037 |
| N FORK SIUSLAW RIVER | Oregon | Scour Critical — Countermeasures Installed | Fair | 1978 | 1,037 |
| COI MAIN CANAL | Oregon | Scour Critical — Countermeasures Installed | Fair | 1978 | 1,030 |
| DEER CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1965 | 1,026 |
| N F WILLAMETTE RIVER | Oregon | Scour Critical — Countermeasures Installed | Fair | 1981 | 1,012 |
| JOE NEY SLOUGH | Oregon | Scour Critical — Countermeasures Installed | Fair | 1989 | 1,011 |
| UNNAMED CHANNEL | Oregon | Scour Critical — Countermeasures Installed | Good | 2024 | 1,000 |
| UNNAMED CHANNEL | Oregon | Scour Critical — Countermeasures Installed | Good | 2024 | 1,000 |
| UNNAMED CHANNEL | Oregon | Scour Critical — Countermeasures Installed | Fair | 2024 | 1,000 |
| UNNAMED CHANNEL | Oregon | Scour Critical — Countermeasures Installed | Good | 2024 | 1,000 |
| MCKENZIE RIVER | Oregon | Scour Critical — Countermeasures Installed | Fair | 1938 | 999 |
| MUDDY CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1978 | 994 |
| EAST FORK NEHALEM RIVER | Oregon | Scour Critical — Countermeasures Installed | Poor | 1952 | 991 |
| LONG TOM RIVER | Oregon | Scour Critical — Countermeasures Installed | Fair | 1976 | 984 |
| LOUSE CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1975 | 984 |
| SILTCOOS RIVER | Oregon | Scour Critical — Countermeasures Installed | Fair | 1975 | 984 |
| JOHNSON CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1955 | 982 |
| ACCESS RD BR RT | Oregon | Scour Critical — Countermeasures Installed | Good | 1984 | 982 |
| MUNGER CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1972 | 966 |
| Chehulpum | Oregon | Scour Critical — Countermeasures Installed | Fair | 1957 | 962 |
| WALLOWA RIVER | Oregon | Scour Critical — Countermeasures Installed | Fair | 1957 | 960 |
| HURRICANE CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1958 | 959 |
| OAK CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1965 | 952 |
| DEER CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1980 | 936 |
| LAKE CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1962 | 929 |
| WILLOW CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1921 | 927 |
| JOHN DAY R(MOORES XING) | Oregon | Scour Critical — Countermeasures Installed | Good | 1964 | 927 |
| JOHNSON CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1962 | 911 |
| Oneonta Gorge Creek | Oregon | Scour Critical — Countermeasures Installed | Fair | 1948 | 901 |
| S F JOHN DAY R. DAYVILLE | Oregon | Scour Critical — Countermeasures Installed | Fair | 1967 | 900 |
| PINE CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1937 | 898 |
| PUDDING RIVER | Oregon | Scour Critical — Countermeasures Installed | Good | 1978 | 897 |
| LITTLE RIVER | Oregon | Scour Critical — Countermeasures Installed | Good | 1981 | 894 |
| NOEL CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1983 | 892 |
| UMATILLA RIVER | Oregon | Scour Critical — Countermeasures Installed | Fair | 1986 | 889 |
| S FK COQUILLE R (WHITE) | Oregon | Scour Critical — Countermeasures Installed | Good | 1966 | 885 |
| RATTLESNAKE CREEK | Oregon | Scour Critical — Countermeasures Installed | Good | 1979 | 884 |
| SLICK ROCK CREEK | Oregon | Scour Critical — Countermeasures Installed | Good | 1963 | 883 |
| SNAKE RIVER (ADRIAN) | Oregon | Scour Critical — Countermeasures Installed | Fair | 1973 | 882 |
| McTimmonds Creek | Oregon | Scour Critical — Countermeasures Installed | Poor | 1967 | 879 |
| NESTUCCA RIVER | Oregon | Scour Critical — Countermeasures Installed | Fair | 1986 | 874 |
| CANYON CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1962 | 871 |
| TILLAMOOK RV | Oregon | Scour Critical — Countermeasures Installed | Fair | 2003 | 863 |
| JIM HUNT CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1957 | 846 |
| WILLAMINA CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1985 | 844 |
| MILTON CREEK | Oregon | Scour Critical — Countermeasures Installed | Good | 1985 | 843 |
| CHENEY CREEK | Oregon | Scour Critical — Countermeasures Installed | Good | 1973 | 843 |
| BROWNING CREEK | Oregon | Scour Critical — Countermeasures Installed | Fair | 1979 | 842 |
| MOHAWK RIVER | Oregon | Scour Critical — Countermeasures Installed | Fair | 1984 | 838 |
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.