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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.

Clear
Bridge State Scour Status Condition Year Built ADT
CALAPOOIA RIVER Oregon Scour Critical — Countermeasures Installed Fair 1940 5,562
FOURMILE CREEK Oregon Scour Critical — Countermeasures Installed Fair 1929 5,551
Ash Swale Oregon Scour Critical — Countermeasures Installed Fair 1922 5,468
S Yamhill River Oregon Scour Critical — Countermeasures Installed Fair 1935 5,448
HERMISTON DITCH Oregon Scour Critical — Countermeasures Installed Fair 1977 5,360
CALAPOOIA RIVER Oregon Scour Critical — Countermeasures Installed Fair 1960 5,356
Willamina River Oregon Scour Critical — Countermeasures Installed Fair 1963 5,308
Rock Creek Oregon Scour Critical — Countermeasures Installed Fair 1986 5,304
Necarney Creek Oregon Scour Critical — Countermeasures Installed Fair 1937 5,300
GRIFFIN CR/SO. STAGE RD. Oregon Scour Critical — Countermeasures Installed Fair 1941 5,270
NECANICUM RIVER Oregon Scour Critical — Countermeasures Installed Fair 1957 5,250
MILL CREEK Oregon Scour Critical — Countermeasures Installed Fair 1948 5,239
GR RONDE R (ISLAND CITY) Oregon Scour Critical — Countermeasures Installed Good 1976 5,223
MORTON CREEK Oregon Scour Critical — Countermeasures Installed Fair 1925 5,197
SIUSLAW RIVER(MAPLETON) Oregon Scour Critical — Countermeasures Installed Fair 1970 5,185
TICKLE CREEK Oregon Scour Critical — Countermeasures Installed Fair 1961 5,162
WALLOWA RIVER (RAILROAD) Oregon Scour Critical — Countermeasures Installed Good 1966 5,160
TROUT CREEK Oregon Scour Critical — Countermeasures Installed Good 1988 5,160
COW CREEK Oregon Scour Critical — Countermeasures Installed Good 2008 5,155
POORMANS CREEK Oregon Scour Critical — Countermeasures Installed Fair 1975 5,143
COAST FORK WILLAMETTE R Oregon Scour Critical — Countermeasures Installed Fair 1960 5,141
SNAKE RIVER(NYSSA) Oregon Scour Critical — Countermeasures Installed Fair 1957 5,100
WILLAMETTE RIVER Oregon Scour Critical — Countermeasures Installed Fair 1952 5,100
Wilson River Oregon Scour Critical — Countermeasures Installed Poor 1939 5,092
FLORAS CREEK Oregon Scour Critical — Countermeasures Installed Fair 1967 5,056
LOST RIVER Oregon Scour Critical — Countermeasures Installed Fair 1941 5,002
POWELL BUTTE CANAL Oregon Scour Critical — Countermeasures Installed Fair 1954 4,833
WILDCAT CREEK Oregon Scour Critical — Countermeasures Installed Fair 1961 4,758
WILDCAT CREEK Oregon Scour Critical — Countermeasures Installed Fair 1961 4,758
WILDCAT CREEK Oregon Scour Critical — Countermeasures Installed Fair 1961 4,758
WALKER CREEK Oregon Scour Critical — Countermeasures Installed Fair 1962 4,730
ELK RIVER Oregon Scour Critical — Countermeasures Installed Fair 1969 4,721
MILL CREEK Oregon Scour Critical — Countermeasures Installed Fair 1930 4,699
MILL CREEK Oregon Scour Critical — Countermeasures Installed Fair 1930 4,699
MILL CREEK Oregon Scour Critical — Countermeasures Installed Fair 1930 4,699
MILL CREEK Oregon Scour Critical — Countermeasures Installed Fair 1930 4,699
KNOWLES CREEK Oregon Scour Critical — Countermeasures Installed Fair 1958 4,630
Willamette River Oregon Scour Critical — Countermeasures Installed Fair 1958 4,595
SOUTH UMPQUA RIVER Oregon Scour Critical — Countermeasures Installed Poor 1946 4,541
A-2 CHANNEL Oregon Scour Critical — Countermeasures Installed Fair 1981 4,539
AMAZON CANAL Oregon Scour Critical — Countermeasures Installed Fair 1973 4,535
North Santiam River Oregon Scour Critical — Countermeasures Installed Fair 1973 4,530
Snake River Oregon Scour Critical — Countermeasures Installed Poor 1953 4,512
NECANICUM RV Oregon Scour Critical — Countermeasures Installed Fair 1952 4,501
LOUSE CREEK Oregon Scour Critical — Countermeasures Installed Good 1957 4,500
DRY CREEK Oregon Scour Critical — Countermeasures Installed Fair 1969 4,484
MILL CREEK Oregon Scour Critical — Countermeasures Installed Fair 1960 4,484
REESE CREEK Oregon Scour Critical — Countermeasures Installed Fair 1963 4,481
SIXES RIVER Oregon Scour Critical — Countermeasures Installed Fair 1971 4,463
CRYSTAL CREEK Oregon Scour Critical — Countermeasures Installed Fair 1971 4,463

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