US Bridges

Nyberg Road over So Fork Naselle River

Good

Pacific County, Washington · 0.74 E JCT 401 · Structure no. 086215000000000

Built
1996
29 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
125 ft
2 main spans
Daily traffic
56
2023 count
Owner
County
County Highway Agency

About this bridge

Nyberg Road over So Fork Naselle River is a prestressed concrete continuous stringer/multi-beam or girder carrying Nyberg Road over So Fork Naselle River in Pacific County, Washington. It was built in 1996, so it is 29 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 56 vehicles a day, projected to reach 90 by 2043. The structure is 125 ft (38.1 m) long and 30 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesNyberg Road
CrossesSo Fork Naselle River
Location0.74 E JCT 401
RouteCounty Highway 17520
CountyPacific County
StateWashington
Coordinates46.34686, -123.81125
Functional classRural Local

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length125 ft (38.1 m)
Longest span79 ft (24 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56 (2023)
Projected traffic90 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nyberg Road over So Fork Naselle River built?

It was built in 1996, making it 29 years old in 2025.

What condition is Nyberg Road over So Fork 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 June 2023.

How much traffic does Nyberg Road over So Fork Naselle River carry?

About 56 vehicles per day (2023 count).

How long is Nyberg Road over So Fork Naselle River?

The structure is 125 ft (38.1 m) long with a longest span of 79 ft (24 m) and a deck 30 ft wide.

Who owns Nyberg Road over So Fork Naselle River?

It is owned by the County Highway Agency.