US Bridges

Naches Tieton Road over Cowiche Creek N. Fork

Good

Yakima County, Washington · 00.14 W Beffa Road · Structure no. 082327000000000

Built
1927
98 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
36 ft
1 main span
Daily traffic
1,100
2020 count
Owner
County
County Highway Agency

About this bridge

Naches Tieton Road over Cowiche Creek N. Fork is a concrete stringer/multi-beam or girder carrying Naches Tieton Road over Cowiche Creek N. Fork in Yakima County, Washington. It was built in 1927, so it is 98 years old, older 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.

It carries about 1,100 vehicles a day, roughly 5% of them trucks, projected to reach 1,250 by 2040. The structure is 36 ft (11 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesNaches Tieton Road
CrossesCowiche Creek N. Fork
Location00.14 W Beffa Road
RouteCounty Highway 20400
Coordinates46.70167, -120.74333
Functional classRural Major 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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.1 US tons
Inventory rating28.9 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length36 ft (11 m)
Longest span34 ft (10.4 m)
Deck width28 ft (8.4 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2020)
Projected traffic1,250 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Naches Tieton Road over Cowiche Creek N. Fork built?

It was built in 1927, making it 98 years old in 2025.

What condition is Naches Tieton 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 July 2024.

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

About 1,100 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Naches Tieton Road over Cowiche Creek N. Fork?

The structure is 36 ft (11 m) long with a longest span of 34 ft (10.4 m) and a deck 28 ft wide.

Who owns Naches Tieton Road over Cowiche Creek N. Fork?

It is owned by the County Highway Agency.