US Bridges

US 101 over Naselle River

Fair

Pacific County, Washington · 12.9 N JCT SR 103 · Structure no. 0012641A0000000

Built
1985
40 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
1,938 ft
16 main spans
Daily traffic
1,911
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Naselle River is a prestressed concrete continuous stringer/multi-beam or girder carrying US 101 over Naselle River in Pacific County, Washington. It was built in 1985, so it is 40 years old, younger 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 1,911 vehicles a day, roughly 10% of them trucks, projected to reach 2,241 by 2039. The structure is 1,938 ft (590.7 m) long and 35 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesUS 101
CrossesNaselle River
Location12.9 N JCT SR 103
RouteU.S. Route 101
CountyPacific County
StateWashington
Coordinates46.42925, -123.90622
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
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 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 rating71 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans16
Design loadHS 20 + Mod
Structure length1,938 ft (590.7 m)
Longest span129 ft (39.3 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,911 (2023)
Projected traffic2,241 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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$31.3 million (2022 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 101 over Naselle River built?

It was built in 1985, making it 40 years old in 2025.

What condition is US 101 over Naselle River 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 May 2023.

How much traffic does US 101 over Naselle River carry?

About 1,911 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is US 101 over Naselle River?

The structure is 1,938 ft (590.7 m) long with a longest span of 129 ft (39.3 m) and a deck 35 ft wide.

Who owns US 101 over Naselle River?

It is owned by the State Highway Agency.