US Bridges

US 97 over Wanity Slough

Good

Yakima County, Washington · 1.5 N JCT SR 22 · Structure no. 0003363A0000000

Built
1948
77 years old
Condition
Good
inspected February 2023
Type
Slab
Concrete Continuous
Length
68 ft
3 main spans
Daily traffic
6,219
2023 count
Owner
State
State Highway Agency

About this bridge

US 97 over Wanity Slough is a concrete continuous slab carrying US 97 over Wanity Slough in Yakima County, Washington. It was built in 1948, so it is 77 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 6,219 vehicles a day, roughly 12% of them trucks, projected to reach 8,804 by 2039. The structure is 68 ft (20.7 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 97
CrossesWanity Slough
Location1.5 N JCT SR 22
RouteU.S. Route 97
Coordinates46.38262, -120.34431
Functional classUrban Minor Arterial

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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length68 ft (20.7 m)
Longest span25 ft (7.6 m)
Deck width37 ft (11.3 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,219 (2023)
Projected traffic8,804 by 2039
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 97 over Wanity Slough built?

It was built in 1948, making it 77 years old in 2025.

What condition is US 97 over Wanity Slough 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 February 2023.

How much traffic does US 97 over Wanity Slough carry?

About 6,219 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 97 over Wanity Slough?

The structure is 68 ft (20.7 m) long with a longest span of 25 ft (7.6 m) and a deck 37 ft wide.

Who owns US 97 over Wanity Slough?

It is owned by the State Highway Agency.