US Bridges

US 97 over Swauk Creek

Good

Kittitas County, Washington · 6.7 N JCT SR 970 · Structure no. 0014218E0000000

Built
1994
31 years old
Condition
Good
inspected August 2024
Type
Culvert
Steel
Length
27 ft
1 main span
Daily traffic
6,080
2023 count
Owner
State
State Highway Agency

About this bridge

US 97 over Swauk Creek is a steel culvert carrying US 97 over Swauk Creek in Kittitas County, Washington. It was built in 1994, so it is 31 years old, younger 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 6,080 vehicles a day, roughly 21% of them trucks, projected to reach 7,689 by 2039. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 13 mi (21 km).

CarriesUS 97
CrossesSwauk Creek
Location6.7 N JCT SR 970
RouteU.S. Route 97
Coordinates47.29256, -120.70039
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span27 ft (8.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,080 (2023)
Projected traffic7,689 by 2039
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$539,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 97 over Swauk Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is US 97 over Swauk Creek 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 2024.

How much traffic does US 97 over Swauk Creek carry?

About 6,080 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is US 97 over Swauk Creek?

The structure is 27 ft (8.2 m) long with a longest span of 27 ft (8.2 m).

Who owns US 97 over Swauk Creek?

It is owned by the State Highway Agency.