US Bridges

SR 970 over Teanaway R

Fair

Kittitas County, Washington · 3.6 E JCT SR 10 · Structure no. 0010530A0000000

Built
1977
48 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
306 ft
4 main spans
Daily traffic
5,741
2023 count
Owner
State
State Highway Agency

About this bridge

SR 970 over Teanaway R is a prestressed concrete continuous box beam or girders - multiple carrying SR 970 over Teanaway R in Kittitas County, Washington. It was built in 1977, so it is 48 years old, younger 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 5,741 vehicles a day, roughly 10% of them trucks, projected to reach 6,982 by 2039. The structure is 306 ft (93.3 m) long and 41 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesSR 970
CrossesTeanaway R
Location3.6 E JCT SR 10
RouteState Highway 970
CountyKittitas County
StateWashington
Coordinates47.19551, -120.78552
Functional classRural Principal Arterial - Other

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
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 rating70 US tons
Inventory rating41 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length306 ft (93.3 m)
Longest span122 ft (37.2 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,741 (2023)
Projected traffic6,982 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemYes

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$5.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 970 over Teanaway R built?

It was built in 1977, making it 48 years old in 2025.

What condition is SR 970 over Teanaway R 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 August 2023.

How much traffic does SR 970 over Teanaway R carry?

About 5,741 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is SR 970 over Teanaway R?

The structure is 306 ft (93.3 m) long with a longest span of 122 ft (37.2 m) and a deck 41 ft wide.

Who owns SR 970 over Teanaway R?

It is owned by the State Highway Agency.