US Bridges

Or 99W (hwy 91) over Plum Creek (ash Swale)

Good

Polk County, Oregon · 002 MI S Yamhill/Polk Lin · Structure no. 22534 091 04975

Built
2019
6 years old
Condition
Good
inspected April 2023
Type
Culvert
Concrete Continuous
Length
34 ft
2 main spans
Daily traffic
5,468
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99W (hwy 91) over Plum Creek (ash Swale) is a concrete continuous culvert carrying Or 99W (hwy 91) over Plum Creek (ash Swale) in Polk County, Oregon. It was built in 2019, so it is 6 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,468 vehicles a day, roughly 16% of them trucks, projected to reach 6,200 by 2042. The structure is 34 ft (10.5 m) long. If it were closed, the detour would be 16.2 mi (26 km).

CarriesOr 99W (hwy 91)
CrossesPlum Creek (ash Swale)
Location002 MI S Yamhill/Polk Lin
RouteState Highway 99
StateOregon
Coordinates45.04271, -123.20707
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHL 93
Structure length34 ft (10.5 m)
Longest span17 ft (5.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,468 (2022)
Projected traffic6,200 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 99W (hwy 91) over Plum Creek (ash Swale) built?

It was built in 2019, making it 6 years old in 2025.

What condition is Or 99W (hwy 91) over Plum Creek (ash Swale) in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does Or 99W (hwy 91) over Plum Creek (ash Swale) carry?

About 5,468 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is Or 99W (hwy 91) over Plum Creek (ash Swale)?

The structure is 34 ft (10.5 m) long with a longest span of 17 ft (5.3 m).

Who owns Or 99W (hwy 91) over Plum Creek (ash Swale)?

It is owned by the State Highway Agency.