US Bridges

North Fork Rd. over Ahtanum Creek N. Fork

PoorPosted for load

Yakima County, Washington · 05.62 NW Ahtanum RD · Structure no. 081004000000000

Built
1953
72 years old
Condition
Poor
inspected November 2022
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
27 ft
1 main span
Daily traffic
328
2020 count
Owner
County
County Highway Agency

About this bridge

North Fork Rd. over Ahtanum Creek N. Fork is a wood or timber stringer/multi-beam or girder carrying North Fork Rd. over Ahtanum Creek N. Fork in Yakima County, Washington. It was built in 1953, so it is 72 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. Its operating status is: posted for load restriction.

It carries about 328 vehicles a day, roughly 10% of them trucks, projected to reach 945 by 2040. The structure is 27 ft (8.2 m) long and 24 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesNorth Fork Rd.
CrossesAhtanum Creek N. Fork
Location05.62 NW Ahtanum RD
RouteCounty Highway 30000
Coordinates46.54833, -120.95667
Functional classRural Minor Collector

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.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2022
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating10.7 US tons
Inventory rating8.3 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 15
Structure length27 ft (8.2 m)
Longest span25 ft (7.6 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic328 (2020)
Projected traffic945 by 2040
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$1.3 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 1953, making it 72 years old in 2025.

What condition is North Fork Rd. over Ahtanum Creek N. Fork 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 November 2022.

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

About 328 vehicles per day (2020 count), of which roughly 10% are trucks.

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

The structure is 27 ft (8.2 m) long with a longest span of 25 ft (7.6 m) and a deck 24 ft wide.

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

It is owned by the County Highway Agency.