US Bridges

US 97 over Swauk CR

Fair

Kittitas County, Washington · 12.9 N JCT SR 10 · Structure no. 0009650A0000000

Built
1974
51 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
266 ft
3 main spans
Daily traffic
2,617
2023 count
Owner
State
State Highway Agency

About this bridge

US 97 over Swauk CR is a prestressed concrete continuous stringer/multi-beam or girder carrying US 97 over Swauk CR in Kittitas County, Washington. It was built in 1974, so it is 51 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 2,617 vehicles a day, roughly 24% of them trucks, projected to reach 3,173 by 2039. The structure is 266 ft (81.1 m) long and 41 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesUS 97
CrossesSwauk CR
Location12.9 N JCT SR 10
RouteU.S. Route 97
CountyKittitas County
StateWashington
Coordinates47.20098, -120.70717
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 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 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 rating83 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length266 ft (81.1 m)
Longest span114 ft (34.7 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,617 (2023)
Projected traffic3,173 by 2039
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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$5.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 97 over Swauk CR built?

It was built in 1974, making it 51 years old in 2025.

What condition is US 97 over Swauk CR 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 July 2023.

How much traffic does US 97 over Swauk CR carry?

About 2,617 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is US 97 over Swauk CR?

The structure is 266 ft (81.1 m) long with a longest span of 114 ft (34.7 m) and a deck 41 ft wide.

Who owns US 97 over Swauk CR?

It is owned by the State Highway Agency.