US Bridges

SR 106 over Skobob Creek

Good

Mason County, Washington · 0.8 E JCT US 101 · Structure no. 0016937A0000000

Built
2005
20 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
120 ft
1 main span
Daily traffic
1,614
2023 count
Owner
State
State Highway Agency

About this bridge

SR 106 over Skobob Creek is a prestressed concrete stringer/multi-beam or girder carrying SR 106 over Skobob Creek in Mason County, Washington. It was built in 2005, so it is 20 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 1,614 vehicles a day, roughly 5% of them trucks, projected to reach 2,210 by 2039. The structure is 120 ft (36.6 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesSR 106
CrossesSkobob Creek
Location0.8 E JCT US 101
RouteState Highway 106
Coordinates47.32392, -123.1515
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93 US tons
Inventory rating48.9 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length120 ft (36.6 m)
Longest span120 ft (36.6 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,614 (2023)
Projected traffic2,210 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

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$2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 106 over Skobob Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is SR 106 over Skobob 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 2024.

How much traffic does SR 106 over Skobob Creek carry?

About 1,614 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SR 106 over Skobob Creek?

The structure is 120 ft (36.6 m) long with a longest span of 120 ft (36.6 m) and a deck 36 ft wide.

Who owns SR 106 over Skobob Creek?

It is owned by the State Highway Agency.