US Bridges

US101 (hwy 9) over Wilson River

Fair

Tillamook County, Oregon · 013 MI N Tillamook · Structure no. 01499 009 06423

Built
1931
94 years old
Condition
Fair
inspected March 2024
Type
Arch - Thru
Concrete
Length
199 ft
1 main span
Daily traffic
11,881
2022 count
Owner
State
State Highway Agency

About this bridge

US101 (hwy 9) over Wilson River is a concrete arch - thru carrying US101 (hwy 9) over Wilson River in Tillamook County, Oregon. It was built in 1931, so it is 94 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 11,881 vehicles a day, roughly 4% of them trucks, projected to reach 12,400 by 2042. The structure is 199 ft (60.7 m) long and 43 ft wide. If it were closed, the detour would be 55.9 mi (90 km).

Location

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CarriesUS101 (hwy 9)
CrossesWilson River
Location013 MI N Tillamook
RouteU.S. Route 101
CountyTillamook County
StateOregon
Coordinates45.47833, -123.84451
Functional classRural Principal Arterial - Other

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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25 US tons
Inventory rating19.3 US tons

Structure

Structure typeArch - Thru
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadH 15
Structure length199 ft (60.7 m)
Longest span120 ft (36.6 m)
Deck width43 ft (13.2 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deck21 ft (6.4 m)

Traffic and service

Average daily traffic11,881 (2022)
Projected traffic12,400 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed55.9 mi (90 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US101 (hwy 9) over Wilson River built?

It was built in 1931, making it 94 years old in 2025.

What condition is US101 (hwy 9) over Wilson River 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 March 2024.

How much traffic does US101 (hwy 9) over Wilson River carry?

About 11,881 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is US101 (hwy 9) over Wilson River?

The structure is 199 ft (60.7 m) long with a longest span of 120 ft (36.6 m) and a deck 43 ft wide.

Who owns US101 (hwy 9) over Wilson River?

It is owned by the State Highway Agency.