US Bridges

Mahoney Road over Cowiche Creek N. Fork

Good

Yakima County, Washington · 0.1 E Pioneer Way · Structure no. 088867000000000

Built
2016
9 years old
Condition
Good
inspected March 2023
Type
Slab
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
93
2023 count
Owner
County
County Highway Agency

About this bridge

Mahoney Road over Cowiche Creek N. Fork is a prestressed concrete slab carrying Mahoney Road over Cowiche Creek N. Fork in Yakima County, Washington. It was built in 2016, so it is 9 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 93 vehicles a day, roughly 5% of them trucks, projected to reach 105 by 2043. The structure is 40 ft (12.2 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesMahoney Road
CrossesCowiche Creek N. Fork
Location0.1 E Pioneer Way
RouteCounty Highway 24910
CountyYakima County
StateWashington
Coordinates46.64744, -120.68241
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length40 ft (12.2 m)
Longest span37 ft (11.3 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic93 (2023)
Projected traffic105 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mahoney Road over Cowiche Creek N. Fork built?

It was built in 2016, making it 9 years old in 2025.

What condition is Mahoney Road over Cowiche Creek N. Fork 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 March 2023.

How much traffic does Mahoney Road over Cowiche Creek N. Fork carry?

About 93 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Mahoney Road over Cowiche Creek N. Fork?

The structure is 40 ft (12.2 m) long with a longest span of 37 ft (11.3 m) and a deck 28 ft wide.

Who owns Mahoney Road over Cowiche Creek N. Fork?

It is owned by the County Highway Agency.