Home › Oregon › Polk County › OR 99W (Hwy 91) over Plum Creek (Ash Swa

OR 99W (Hwy 91) over Plum Creek (Ash Swale)

Polk County, Oregon · rated Good in the 2025 National Bridge Inventory

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

OR 99W (Hwy 91) over Plum Creek (Ash Swale) in Polk County, Oregon, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
It was built in 2019, making it 6 years old at the 2025 inventory.
It carries about 5,468 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 37 of the 162 inventoried bridges in Polk County rated good (22.8%); 12 (7.4%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	7	Good condition


Structure	Continuous concrete culvert
Length	about 34 ft
Location	002 Mi S Yamhill/polk Lin
NBI structure number	22534 091 04975
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Or 22 (HWY30AZ) E over Hwy 150 Conn. & Park Rd	1953	45,083	Fair
Or 22 (hwy 30) over Boat Moorage Access	1963	44,753	Fair
Or 22 (hwy 30) over OR 221 (HWY 150) Conn	1963	29,957	Fair
OR 22 (Hwy 30) over Mud Slough	1973	28,015	Good
Or 22 (hwy 30) Con over Wallace Marine Park	1953	22,964	Fair
OR 22 (Hwy 30) over W&p RR	1973	22,774	Good