US Bridges

SR 108 over Skookum Creek

Fair

Mason County, Washington · 6.9 E Grays Hbr CO · Structure no. 0004130B0000000

Built
1952
73 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
87 ft
5 main spans
Daily traffic
3,948
2023 count
Owner
State
State Highway Agency

About this bridge

SR 108 over Skookum Creek is a wood or timber stringer/multi-beam or girder carrying SR 108 over Skookum Creek in Mason County, Washington. It was built in 1952, so it is 73 years old, older 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 3,948 vehicles a day, roughly 17% of them trucks, projected to reach 4,932 by 2039. The structure is 87 ft (26.5 m) long and 29 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

Location

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CarriesSR 108
CrossesSkookum Creek
Location6.9 E Grays Hbr CO
RouteState Highway 108
CountyMason County
StateWashington
Coordinates47.12497, -123.11381
Functional classRural Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating28 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans5
Design loadH 15
Structure length87 ft (26.5 m)
Longest span17 ft (5.2 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,948 (2023)
Projected traffic4,932 by 2039
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 108 over Skookum Creek built?

It was built in 1952, making it 73 years old in 2025.

What condition is SR 108 over Skookum Creek 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 March 2023.

How much traffic does SR 108 over Skookum Creek carry?

About 3,948 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is SR 108 over Skookum Creek?

The structure is 87 ft (26.5 m) long with a longest span of 17 ft (5.2 m) and a deck 29 ft wide.

Who owns SR 108 over Skookum Creek?

It is owned by the State Highway Agency.