US Bridges

SR 970 over Np RY

Good

Kittitas County, Washington · 0.3 E JCT I-90 · Structure no. 0007792A0000000

Built
1966
59 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
145 ft
3 main spans
Daily traffic
5,929
2023 count
Owner
State
State Highway Agency

About this bridge

SR 970 over Np RY is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 970 over Np RY in Kittitas County, Washington. It was built in 1966, so it is 59 years old, older 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 5,929 vehicles a day, roughly 17% of them trucks, projected to reach 7,267 by 2039. The structure is 145 ft (44.2 m) long and 40 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesSR 970
CrossesNp RY
Location0.3 E JCT I-90
RouteState Highway 970
Coordinates47.18679, -120.90053
Functional classRural Principal Arterial - Other

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.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length145 ft (44.2 m)
Longest span48 ft (14.6 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,929 (2023)
Projected traffic7,267 by 2039
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed6.2 mi (10 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$2.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 970 over Np RY built?

It was built in 1966, making it 59 years old in 2025.

What condition is SR 970 over Np RY 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 August 2023.

How much traffic does SR 970 over Np RY carry?

About 5,929 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is SR 970 over Np RY?

The structure is 145 ft (44.2 m) long with a longest span of 48 ft (14.6 m) and a deck 40 ft wide.

Who owns SR 970 over Np RY?

It is owned by the State Highway Agency.