US Bridges

US 101 over Chinook R

Fair

Pacific County, Washington · 6.6 N JCT SR 401 · Structure no. 0001074A0000000

Built
1927
98 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
28 ft
3 main spans
Daily traffic
7,256
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Chinook R is a concrete continuous culvert carrying US 101 over Chinook R in Pacific County, Washington. It was built in 1927, so it is 98 years old, older than the Washington average of 49.8 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 7,256 vehicles a day, roughly 6% of them trucks, projected to reach 8,924 by 2039. The structure is 28 ft (8.5 m) long and 33 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesUS 101
CrossesChinook R
Location6.6 N JCT SR 401
RouteU.S. Route 101
CountyPacific County
StateWashington
Coordinates46.30403, -123.96701
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
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 rating106.8 US tons
Inventory rating106.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span8 ft (2.4 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,256 (2023)
Projected traffic8,924 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$426,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over Chinook R built?

It was built in 1927, making it 98 years old in 2025.

What condition is US 101 over Chinook R 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 June 2023.

How much traffic does US 101 over Chinook R carry?

About 7,256 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 101 over Chinook R?

The structure is 28 ft (8.5 m) long with a longest span of 8 ft (2.4 m) and a deck 33 ft wide.

Who owns US 101 over Chinook R?

It is owned by the State Highway Agency.