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
NORTH MYRTLE CREEK	Oregon	Scour Critical — Unaddressed	Fair	1976	331
BEAR CREEK	Oregon	Scour Critical — Unaddressed	Poor	2000	91
HERMAN CREEK	Oregon	Scour Critical — Unaddressed	Poor	1966	25
BLACK ROCK CREEK	Oregon	Scour Critical — Unaddressed	Poor	1973	5
Willamette River	Oregon	Scour Critical — Countermeasures Ineffective	Fair	2023	12,687
SOUTH MYRTLE CREEK	Oregon	Scour Critical — Countermeasures Ineffective	Good	2024	272
LEMOLO #1 CANAL	Oregon	Scour Critical — Countermeasures Ineffective	Fair	1960	50
LEMOLO #1 SPILLWAY	Oregon	Scour Critical — Countermeasures Ineffective	Fair	1954	50
LEMOLO #1 CANAL	Oregon	Scour Critical — Countermeasures Ineffective	Fair	1962	50
S.FORK LONG CREEK	Oregon	Scour Critical — Countermeasures Ineffective	Good	2024	21
HACKETT CREEK	Oregon	Scour Critical — Countermeasures Installed	Fair	1965	165,900
TUALATIN RIVER	Oregon	Scour Critical — Countermeasures Installed	Fair	1975	156,016
Columbia R./So. Channel	Oregon	Scour Critical — Countermeasures Installed	Fair	1982	148,936
Columbia River	Oregon	Scour Critical — Countermeasures Installed	Fair	1982	148,936
Oregon Slough	Oregon	Scour Critical — Countermeasures Installed	Fair	1987	125,775
Willamette River	Oregon	Scour Critical — Countermeasures Installed	Fair	1973	103,251
Willamette River	Oregon	Scour Critical — Countermeasures Installed	Fair	1970	97,105
HWY 1	Oregon	Scour Critical — Countermeasures Installed	Fair	1963	76,816
HWY 1 I-5	Oregon	Scour Critical — Countermeasures Installed	Fair	1963	71,767
Columbia River	Oregon	Scour Critical — Countermeasures Installed	Fair	1916	65,013
Columbia River	Oregon	Scour Critical — Countermeasures Installed	Fair	1958	65,013
Clackamas River	Oregon	Scour Critical — Countermeasures Installed	Fair	1962	62,210
Clackamas River	Oregon	Scour Critical — Countermeasures Installed	Fair	1962	62,210
WILLAMETTE RIVER	Oregon	Scour Critical — Countermeasures Installed	Fair	1967	55,375
WILLAMETTE RIVER	Oregon	Scour Critical — Countermeasures Installed	Fair	1958	55,335
CROW CREEK	Oregon	Scour Critical — Countermeasures Installed	Fair	1964	55,046
MEDFORD VIADUCT	Oregon	Scour Critical — Countermeasures Installed	Fair	1962	53,404
CLEAR CREEK	Oregon	Scour Critical — Countermeasures Installed	Fair	1930	51,600
Willamette River	Oregon	Scour Critical — Countermeasures Installed	Fair	1953	45,083
Johnson Creek	Oregon	Scour Critical — Countermeasures Installed	Fair	1991	45,032
Willamette River	Oregon	Scour Critical — Countermeasures Installed	Fair	1953	44,573
Mill Creek	Oregon	Scour Critical — Countermeasures Installed	Fair	1956	43,693
CENTRAL OREGON CANAL	Oregon	Scour Critical — Countermeasures Installed	Fair	1966	42,538
MILL CREEK	Oregon	Scour Critical — Countermeasures Installed	Fair	1949	40,878
MILL CREEK	Oregon	Scour Critical — Countermeasures Installed	Fair	1929	40,878
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
EVANS CREEK	Oregon	Scour Critical — Countermeasures Installed	Fair	1961	37,706
WARD CREEK	Oregon	Scour Critical — Countermeasures Installed	Fair	1962	37,706
BEAR CREEK	Oregon	Scour Critical — Countermeasures Installed	Fair	1961	36,121
WILLAMETTE RIVER	Oregon	Scour Critical — Countermeasures Installed	Fair	1926	35,000
AMAZON CREEK	Oregon	Scour Critical — Countermeasures Installed	Good	1977	33,645
Santiam Overflow No. 2	Oregon	Scour Critical — Countermeasures Installed	Fair	1994	33,486
Santiam Overflow No. 3	Oregon	Scour Critical — Countermeasures Installed	Fair	1994	33,446
Santiam Overflow No. 3	Oregon	Scour Critical — Countermeasures Installed	Fair	1958	33,446
Santiam Overflow No. 4	Oregon	Scour Critical — Countermeasures Installed	Fair	1958	33,446
Santiam Overflow No. 4	Oregon	Scour Critical — Countermeasures Installed	Fair	1994	33,446
CLACKAMAS RIVER	Oregon	Scour Critical — Countermeasures Installed	Fair	1933	33,434
WILLAMETTE RIVER	Oregon	Scour Critical — Countermeasures Installed	Fair	1910	32,243
Owl Creek	Oregon	Scour Critical — Countermeasures Installed	Fair	1965	32,045

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.

All Bridges Poor Condition Historic Bridges Bridge Stats