US Bridges

East Taneum Road over Taneum Creek

Fair

Kittitas County, Washington · 00.43 E I-90 · Structure no. 080306000000000

Built
1957
68 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Concrete Continuous
Length
78 ft
1 main span
Daily traffic
134
2020 count
Owner
County
County Highway Agency

About this bridge

East Taneum Road over Taneum Creek is a concrete continuous stringer/multi-beam or girder carrying East Taneum Road over Taneum Creek in Kittitas County, Washington. It was built in 1957, so it is 68 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 5 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 134 vehicles a day, roughly 20% of them trucks, projected to reach 355 by 2040. The structure is 78 ft (23.8 m) long and 26 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesEast Taneum Road
CrossesTaneum Creek
Location00.43 E I-90
RouteCounty Highway 56770
CountyKittitas County
StateWashington
Coordinates47.0821, -120.73334
Functional classRural Minor 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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.8 US tons
Inventory rating16.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 15
Structure length78 ft (23.8 m)
Longest span58 ft (17.7 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic134 (2020)
Projected traffic355 by 2040
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed9.9 mi (16 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 East Taneum Road over Taneum Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is East Taneum Road over Taneum 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 October 2023.

How much traffic does East Taneum Road over Taneum Creek carry?

About 134 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is East Taneum Road over Taneum Creek?

The structure is 78 ft (23.8 m) long with a longest span of 58 ft (17.7 m) and a deck 26 ft wide.

Who owns East Taneum Road over Taneum Creek?

It is owned by the County Highway Agency.