US Bridges

North Fork Rd. over Ahtanum Creek N. Fork

GoodPosted for load

Yakima County, Washington · 01.24 NW Ahtanum RD · Structure no. 081403000000000

Built
1976
49 years old
Condition
Good
inspected June 2023
Type
Channel Beam
Concrete
Length
40 ft
1 main span
Daily traffic
535
2021 count
Owner
County
County Highway Agency

About this bridge

North Fork Rd. over Ahtanum Creek N. Fork is a concrete channel beam carrying North Fork Rd. over Ahtanum Creek N. Fork in Yakima County, Washington. It was built in 1976, so it is 49 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. Its operating status is: posted for load restriction.

It carries about 535 vehicles a day, roughly 10% of them trucks, projected to reach 565 by 2041. The structure is 40 ft (12.2 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesNorth Fork Rd.
CrossesAhtanum Creek N. Fork
Location01.24 NW Ahtanum RD
RouteCounty Highway 30000
CountyYakima County
StateWashington
Coordinates46.545, -120.885
Functional classRural Minor Collector

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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.7 US tons
Inventory rating11.8 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckOther
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic535 (2021)
Projected traffic565 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 North Fork Rd. over Ahtanum Creek N. Fork built?

It was built in 1976, making it 49 years old in 2025.

What condition is North Fork Rd. over Ahtanum 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 June 2023.

How much traffic does North Fork Rd. over Ahtanum Creek N. Fork carry?

About 535 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is North Fork Rd. over Ahtanum Creek N. Fork?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 32 ft wide.

Who owns North Fork Rd. over Ahtanum Creek N. Fork?

It is owned by the County Highway Agency.