US Bridges

SR 6 over Willapa River

Good

Pacific County, Washington · 9.4 E JCT US 101 · Structure no. 0004552A0000000

Built
1953
72 years old
Condition
Good
inspected April 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
200 ft
3 main spans
Daily traffic
1,825
2023 count
Owner
State
State Highway Agency

About this bridge

SR 6 over Willapa River is a concrete continuous box beam or girders - multiple carrying SR 6 over Willapa River in Pacific County, Washington. It was built in 1953, so it is 72 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 1,825 vehicles a day, roughly 13% of them trucks, projected to reach 2,107 by 2039. The structure is 200 ft (61 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSR 6
CrossesWillapa River
Location9.4 E JCT US 101
RouteState Highway 6
Coordinates46.58206, -123.61869
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 rating65.7 US tons
Inventory rating50.7 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length200 ft (61 m)
Longest span110 ft (33.5 m)
Deck width34 ft (10.3 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,825 (2023)
Projected traffic2,107 by 2039
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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$3.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 6 over Willapa River built?

It was built in 1953, making it 72 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 1,825 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SR 6 over Willapa River?

The structure is 200 ft (61 m) long with a longest span of 110 ft (33.5 m) and a deck 34 ft wide.

Who owns SR 6 over Willapa River?

It is owned by the State Highway Agency.