US Bridges

Main ST (old US97) over Ahtanum Creek

Fair

Yakima County, Washington · 14.5 N JCT SR 22 · Structure no. 0002661A0000000

Built
1941
84 years old
Condition
Fair
inspected April 2024
Type
Tee Beam
Concrete Continuous
Length
156 ft
3 main spans
Daily traffic
8,981
2012 count
Owner
State
State Highway Agency

About this bridge

Main ST (old US97) over Ahtanum Creek is a concrete continuous tee beam carrying Main ST (old US97) over Ahtanum Creek in Yakima County, Washington. It was built in 1941, so it is 84 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 8,981 vehicles a day, roughly 7% of them trucks, projected to reach 13,292 by 2036. The structure is 156 ft (47.5 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMain ST (old US97)
CrossesAhtanum Creek
Location14.5 N JCT SR 22
RouteCounty Highway 97
CountyYakima County
StateWashington
Coordinates46.537, -120.47517
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.1 US tons
Inventory rating20 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length156 ft (47.5 m)
Longest span66 ft (20.1 m)
Deck width32 ft (9.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,981 (2012)
Projected traffic13,292 by 2036
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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$2.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Main ST (old US97) over Ahtanum Creek built?

It was built in 1941, making it 84 years old in 2025.

What condition is Main ST (old US97) over Ahtanum Creek 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 April 2024.

How much traffic does Main ST (old US97) over Ahtanum Creek carry?

About 8,981 vehicles per day (2012 count), of which roughly 7% are trucks.

How long is Main ST (old US97) over Ahtanum Creek?

The structure is 156 ft (47.5 m) long with a longest span of 66 ft (20.1 m) and a deck 32 ft wide.

Who owns Main ST (old US97) over Ahtanum Creek?

It is owned by the State Highway Agency.