US Bridges

SR 6 over Willapa River

Good

Pacific County, Washington · 14.0 E JCT US 101 · Structure no. 0005493A0000000

Built
1957
68 years old
Condition
Good
inspected May 2023
Type
Tee Beam
Concrete Continuous
Length
142 ft
3 main spans
Daily traffic
1,600
2023 count
Owner
State
State Highway Agency

About this bridge

SR 6 over Willapa River is a concrete continuous tee beam carrying SR 6 over Willapa River in Pacific County, Washington. It was built in 1957, so it is 68 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,600 vehicles a day, roughly 13% of them trucks, projected to reach 1,667 by 2039. The structure is 142 ft (43.4 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSR 6
CrossesWillapa River
Location14.0 E JCT US 101
RouteState Highway 6
Coordinates46.56096, -123.56058
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43 US tons
Inventory rating26 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length142 ft (43.4 m)
Longest span60 ft (18.3 m)
Deck width34 ft (10.3 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2023)
Projected traffic1,667 by 2039
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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$2.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 6 over Willapa River built?

It was built in 1957, making it 68 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 May 2023.

How much traffic does SR 6 over Willapa River carry?

About 1,600 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SR 6 over Willapa River?

The structure is 142 ft (43.4 m) long with a longest span of 60 ft (18.3 m) and a deck 34 ft wide.

Who owns SR 6 over Willapa River?

It is owned by the State Highway Agency.