US Bridges

SR 6 over Willapa River

Good

Pacific County, Washington · 7.0 E JCT US 101 · Structure no. 0018464A0000000

Built
2014
11 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
275 ft
3 main spans
Daily traffic
2,737
2023 count
Owner
State
State Highway Agency

About this bridge

SR 6 over Willapa River is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 6 over Willapa River in Pacific County, Washington. It was built in 2014, so it is 11 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,737 vehicles a day, roughly 9% of them trucks, projected to reach 3,052 by 2039. The structure is 275 ft (83.8 m) long and 39 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesSR 6
CrossesWillapa River
Location7.0 E JCT US 101
RouteState Highway 6
Coordinates46.61236, -123.6405
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
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 rating51.8 US tons
Inventory rating40 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length275 ft (83.8 m)
Longest span125 ft (38.1 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,737 (2023)
Projected traffic3,052 by 2039
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 6 over Willapa River built?

It was built in 2014, making it 11 years old in 2025.

What condition is SR 6 over Willapa River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does SR 6 over Willapa River carry?

About 2,737 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SR 6 over Willapa River?

The structure is 275 ft (83.8 m) long with a longest span of 125 ft (38.1 m) and a deck 39 ft wide.

Who owns SR 6 over Willapa River?

It is owned by the State Highway Agency.