US Bridges

SR 4 over Naselle River

Good

Pacific County, Washington · 1.3 E JCT SR 401 · Structure no. 0013040A0000000

Built
1987
38 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
201 ft
3 main spans
Daily traffic
2,183
2023 count
Owner
State
State Highway Agency

About this bridge

SR 4 over Naselle River is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 4 over Naselle River in Pacific County, Washington. It was built in 1987, so it is 38 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 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 2,183 vehicles a day, roughly 13% of them trucks, projected to reach 2,762 by 2039. The structure is 201 ft (61.3 m) long and 39 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR 4
CrossesNaselle River
Location1.3 E JCT SR 401
RouteState Highway 4
CountyPacific County
StateWashington
Coordinates46.36813, -123.78058
Functional classRural Principal Arterial - Other

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 inspectionAugust 2023
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 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 rating86 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length201 ft (61.3 m)
Longest span76 ft (23.2 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,183 (2023)
Projected traffic2,762 by 2039
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

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$3.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 4 over Naselle River built?

It was built in 1987, making it 38 years old in 2025.

What condition is SR 4 over Naselle 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 August 2023.

How much traffic does SR 4 over Naselle River carry?

About 2,183 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SR 4 over Naselle River?

The structure is 201 ft (61.3 m) long with a longest span of 76 ft (23.2 m) and a deck 39 ft wide.

Who owns SR 4 over Naselle River?

It is owned by the State Highway Agency.