US Bridges

Skookumchuck Road over Skookumchuck River

Good

Thurston County, Washington · 5.SE JCT SR507 · Structure no. 086259000000000

Built
1996
29 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
156 ft
1 main span
Daily traffic
246
2020 count
Owner
County
County Highway Agency

About this bridge

Skookumchuck Road over Skookumchuck River is a prestressed concrete stringer/multi-beam or girder carrying Skookumchuck Road over Skookumchuck River in Thurston 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 246 vehicles a day, roughly 15% of them trucks, projected to reach 380 by 2042. The structure is 156 ft (47.5 m) long and 30 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

CarriesSkookumchuck Road
CrossesSkookumchuck River
Location5.SE JCT SR507
RouteCounty Highway 14695
Coordinates46.79613, -122.76119
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating68 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length156 ft (47.5 m)
Longest span145 ft (44.2 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic246 (2020)
Projected traffic380 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 proposedReplacement because of relocation of road
Estimated improvement cost$6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Skookumchuck Road over Skookumchuck River built?

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

What condition is Skookumchuck Road over Skookumchuck 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 July 2023.

How much traffic does Skookumchuck Road over Skookumchuck River carry?

About 246 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Skookumchuck Road over Skookumchuck River?

The structure is 156 ft (47.5 m) long with a longest span of 145 ft (44.2 m) and a deck 30 ft wide.

Who owns Skookumchuck Road over Skookumchuck River?

It is owned by the County Highway Agency.