US Bridges

Or 99W (hwy 91) over Or 18 (hwy 39)

Fair

Yamhill County, Oregon · 002 MI S Mcminnville · Structure no. 08904 01W 03924

Built
1963
62 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete Continuous
Length
125 ft
3 main spans
Daily traffic
11,077
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99W (hwy 91) over Or 18 (hwy 39) is a concrete continuous slab carrying Or 99W (hwy 91) over Or 18 (hwy 39) in Yamhill County, Oregon. It was built in 1963, so it is 62 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 6 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 11,077 vehicles a day, roughly 4% of them trucks, projected to reach 14,500 by 2042. The structure is 125 ft (38.1 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesOr 99W (hwy 91)
CrossesOr 18 (hwy 39)
Location002 MI S Mcminnville
RouteState Highway 99
CountyYamhill County
StateOregon
Coordinates45.19043, -123.20995
Functional classUrban Other Principal 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating29.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length125 ft (38.1 m)
Longest span50 ft (15.2 m)
Deck width42 ft (12.7 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,077 (2022)
Projected traffic14,500 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$640,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Or 99W (hwy 91) over Or 18 (hwy 39) built?

It was built in 1963, making it 62 years old in 2025.

What condition is Or 99W (hwy 91) over Or 18 (hwy 39) 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 Or 18 (hwy 39) carry?

About 11,077 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Or 99W (hwy 91) over Or 18 (hwy 39)?

The structure is 125 ft (38.1 m) long with a longest span of 50 ft (15.2 m) and a deck 42 ft wide.

Who owns Or 99W (hwy 91) over Or 18 (hwy 39)?

It is owned by the State Highway Agency.