US Bridges

Or 99W (hwy 91) over Ash Swale

Fair

Yamhill County, Oregon · 020 MI N Yamhill/Polk Lin · Structure no. 00372A01W 04729

Built
1922
103 years old, rebuilt 1960
Condition
Fair
inspected April 2023
Type
Channel Beam
Concrete
Length
92 ft
3 main spans
Daily traffic
5,468
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99W (hwy 91) over Ash Swale is a concrete channel beam carrying Or 99W (hwy 91) over Ash Swale in Yamhill County, Oregon. It was built in 1922 and reconstructed in 1960, so it is 103 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,468 vehicles a day, roughly 16% of them trucks, projected to reach 6,200 by 2042. The structure is 92 ft (28 m) long and 47 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

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CarriesOr 99W (hwy 91)
CrossesAsh Swale
Location020 MI N Yamhill/Polk Lin
RouteState Highway 99
CountyYamhill County
StateOregon
Coordinates45.07801, -123.20947
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length92 ft (28 m)
Longest span35 ft (10.7 m)
Deck width47 ft (14.3 m)
Roadway width40 ft (12.2 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 Ash Swale built?

It was built in 1922, making it 103 years old in 2025. It was reconstructed in 1960.

What condition is Or 99W (hwy 91) over Ash Swale in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.

How much traffic does Or 99W (hwy 91) over 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 Ash Swale?

The structure is 92 ft (28 m) long with a longest span of 35 ft (10.7 m) and a deck 47 ft wide.

Who owns Or 99W (hwy 91) over Ash Swale?

It is owned by the State Highway Agency.