US Bridges

Tjossem Road over Wilson Creek

Fair

Kittitas County, Washington · 00.08 E Canyon Road · Structure no. 081509000000000

Built
1962
63 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete Continuous
Length
56 ft
1 main span
Daily traffic
1,212
2023 count
Owner
County
County Highway Agency

About this bridge

Tjossem Road over Wilson Creek is a concrete continuous tee beam carrying Tjossem Road over Wilson Creek in Kittitas County, Washington. It was built in 1962, so it is 63 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 1,212 vehicles a day, roughly 28% of them trucks, projected to reach 2,737 by 2041. The structure is 56 ft (17.1 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesTjossem Road
CrossesWilson Creek
Location00.08 E Canyon Road
RouteCounty Highway 96865
CountyKittitas County
StateWashington
Coordinates46.95899, -120.52851
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment6: Equal to present minimum criteria
Operating rating48.6 US tons
Inventory rating37.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckOther
Main spans1
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span53 ft (16.2 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,212 (2023)
Projected traffic2,737 by 2041
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Tjossem Road over Wilson Creek built?

It was built in 1962, making it 63 years old in 2025.

What condition is Tjossem Road over Wilson 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 November 2023.

How much traffic does Tjossem Road over Wilson Creek carry?

About 1,212 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is Tjossem Road over Wilson Creek?

The structure is 56 ft (17.1 m) long with a longest span of 53 ft (16.2 m) and a deck 27 ft wide.

Who owns Tjossem Road over Wilson Creek?

It is owned by the County Highway Agency.