US Bridges

Skokomish Valley R over Vance Creek

Good

Mason County, Washington · 6.19 M W SR 101 · Structure no. 081325000000000

Built
1986
39 years old
Condition
Good
inspected July 2023
Type
Tee Beam
Prestressed Concrete
Length
140 ft
1 main span
Daily traffic
110
2020 count
Owner
County
County Highway Agency

About this bridge

Skokomish Valley R over Vance Creek is a prestressed concrete tee beam carrying Skokomish Valley R over Vance Creek in Mason County, Washington. It was built in 1986, so it is 39 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 110 vehicles a day, roughly 5% of them trucks, projected to reach 150 by 2040. The structure is 140 ft (42.7 m) long and 30 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesSkokomish Valley R
CrossesVance Creek
Location6.19 M W SR 101
RouteCounty Highway 41640
Coordinates47.32247, -123.28586
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating28 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span137 ft (41.9 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2020)
Projected traffic150 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$200,000 (2030 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Skokomish Valley R over Vance Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is Skokomish Valley R over Vance Creek 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 Skokomish Valley R over Vance Creek carry?

About 110 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Skokomish Valley R over Vance Creek?

The structure is 140 ft (42.7 m) long with a longest span of 137 ft (41.9 m) and a deck 30 ft wide.

Who owns Skokomish Valley R over Vance Creek?

It is owned by the County Highway Agency.