US Bridges

US 101 over N Fk Willapa

Fair

Pacific County, Washington · 0.7 N JCT SR 6 · Structure no. 0013872A0000000

Built
1992
33 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
898 ft
7 main spans
Daily traffic
8,151
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over N Fk Willapa is a prestressed concrete continuous stringer/multi-beam or girder carrying US 101 over N Fk Willapa in Pacific County, Washington. It was built in 1992, so it is 33 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 8,151 vehicles a day, roughly 7% of them trucks, projected to reach 10,061 by 2039. The structure is 898 ft (273.7 m) long and 54 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesUS 101
CrossesN Fk Willapa
Location0.7 N JCT SR 6
RouteU.S. Route 101
CountyPacific County
StateWashington
Coordinates46.691, -123.73228
Functional classRural Principal Arterial - Other

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.
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 above top of footing
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 spans7
Design loadHS 20
Structure length898 ft (273.7 m)
Longest span129 ft (39.3 m)
Deck width54 ft (16.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,151 (2023)
Projected traffic10,061 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$17.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 101 over N Fk Willapa built?

It was built in 1992, making it 33 years old in 2025.

What condition is US 101 over N Fk Willapa 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 N Fk Willapa carry?

About 8,151 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 101 over N Fk Willapa?

The structure is 898 ft (273.7 m) long with a longest span of 129 ft (39.3 m) and a deck 54 ft wide.

Who owns US 101 over N Fk Willapa?

It is owned by the State Highway Agency.