US Bridges

Skookumchuck Road over Skookumchuck River

Fair

Thurston County, Washington · 2.3 SE JCT SR507 · Structure no. 080936000000000

Built
1984
41 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
150 ft
1 main span
Daily traffic
981
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 1984, so it is 41 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 981 vehicles a day, roughly 10% of them trucks, projected to reach 1,517 by 2042. The structure is 150 ft (45.7 m) long and 31 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesSkookumchuck Road
CrossesSkookumchuck River
Location2.3 SE JCT SR507
RouteCounty Highway 14695
CountyThurston County
StateWashington
Coordinates46.80738, -122.82408
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
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 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 alignment6: Equal to present minimum criteria
Operating rating99 US tons
Inventory rating73 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span145 ft (44.2 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic981 (2020)
Projected traffic1,517 by 2042
Trucks10%
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 statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$5.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Skookumchuck Road over Skookumchuck River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Skookumchuck Road over Skookumchuck 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 July 2023.

How much traffic does Skookumchuck Road over Skookumchuck River carry?

About 981 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Skookumchuck Road over Skookumchuck River?

The structure is 150 ft (45.7 m) long with a longest span of 145 ft (44.2 m) and a deck 31 ft wide.

Who owns Skookumchuck Road over Skookumchuck River?

It is owned by the County Highway Agency.