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US 20 (Hwy 33) over Oak Creek

Benton County, Oregon · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

US 20 (Hwy 33) over Oak Creek in Benton County, Oregon, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1960, making it 65 years old at the 2025 inventory.
It carries about 22,169 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 120 of the 190 inventoried bridges in Benton County rated fair (63.2%); 20 (10.5%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	6	Satisfactory condition


Structure	Continuous concrete culvert
Length	about 23 ft
Location	005 Mi E of Corvallis Wcl
NBI structure number	08628 033 05516
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Oregon department of transportation.

Bridge	Built	Vehicles/day	Condition
OR 99W (Hwy 91) SB over Marys River	1949	23,359	Fair
US 20 (Hwy 33) over Wprr	1960	22,606	Fair
OR 34 (Hwy 33) over Willamette River	1991	22,606	Good
Or 34 (hwy 33) over 3rd & 4th Streets	1992	22,606	Good
NW 9TH St over Dixon CR	1985	20,182	Fair
NW 9TH Street over Sequoia Creek	1940	19,662	Fair