US Bridges

Or 99W (hwy 91) over Chehalem Creek

Fair

Yamhill County, Oregon · 001 MI SW Newberg · Structure no. 02054A01W 02420

Built
1975
50 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
819 ft
7 main spans
Daily traffic
22,646
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99W (hwy 91) over Chehalem Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying Or 99W (hwy 91) over Chehalem Creek in Yamhill County, Oregon. It was built in 1975, so it is 50 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 22,646 vehicles a day, roughly 4% of them trucks, projected to reach 23,900 by 2042. The structure is 819 ft (249.6 m) long and 82 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesOr 99W (hwy 91)
CrossesChehalem Creek
Location001 MI SW Newberg
RouteState Highway 99
CountyYamhill County
StateOregon
Coordinates45.2975, -122.9876
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.4 US tons
Inventory rating19.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length819 ft (249.6 m)
Longest span117 ft (35.7 m)
Deck width82 ft (25.1 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,646 (2022)
Projected traffic23,900 by 2042
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.7 mi (14 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Or 99W (hwy 91) over Chehalem Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Or 99W (hwy 91) over Chehalem Creek 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 Chehalem Creek carry?

About 22,646 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Or 99W (hwy 91) over Chehalem Creek?

The structure is 819 ft (249.6 m) long with a longest span of 117 ft (35.7 m) and a deck 82 ft wide.

Who owns Or 99W (hwy 91) over Chehalem Creek?

It is owned by the State Highway Agency.