US Bridges

US 97 over Wanity Slough

Poor

Yakima County, Washington · 1.5 N JCT SR 22 · Structure no. 0007457A0000000

Built
1964
61 years old
Condition
Poor
inspected February 2023
Type
Slab
Concrete Continuous
Length
74 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 1964, so it is 61 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 6,219 vehicles a day, roughly 12% of them trucks, projected to reach 8,804 by 2039. The structure is 74 ft (22.6 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 97
CrossesWanity Slough
Location1.5 N JCT SR 22
RouteU.S. Route 97
CountyYakima County
StateWashington
Coordinates46.38251, -120.34436
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to 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 rating61.9 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length74 ft (22.6 m)
Longest span30 ft (9.1 m)
Deck width39 ft (12 m)
Roadway width36 ft (11.1 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$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 97 over Wanity Slough built?

It was built in 1964, making it 61 years old in 2025.

What condition is US 97 over Wanity Slough in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. 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 74 ft (22.6 m) long with a longest span of 30 ft (9.1 m) and a deck 39 ft wide.

Who owns US 97 over Wanity Slough?

It is owned by the State Highway Agency.