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OR 99W (Hwy 91) SB over Marys River

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

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

OR 99W (Hwy 91) SB over Marys River 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 substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1949 and reconstructed in 1992, making it 76 years old at the 2025 inventory.
It carries about 23,359 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


Structure	Continuous concrete tee beam
Length	about 405 ft
Location	In Corvallis
NBI structure number	07019 01W 08421
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
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
US 20 (Hwy 33) over Oak Creek	1960	22,169	Fair
NW 9TH St over Dixon CR	1985	20,182	Fair
NW 9TH Street over Sequoia Creek	1940	19,662	Fair