US Bridges

Cowiche Mill Rd. over Cowiche Creek

Good

Yakima County, Washington · 03.01 W Sunset Way · Structure no. 084533000000000

Built
1977
48 years old
Condition
Good
inspected March 2023
Type
Channel Beam
Concrete
Length
22 ft
1 main span
Daily traffic
202
2021 count
Owner
County
County Highway Agency

About this bridge

Cowiche Mill Rd. over Cowiche Creek is a concrete channel beam carrying Cowiche Mill Rd. over Cowiche Creek in Yakima County, Washington. It was built in 1977, so it is 48 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.

It carries about 202 vehicles a day, roughly 10% of them trucks, projected to reach 243 by 2041. The structure is 22 ft (6.7 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesCowiche Mill Rd.
CrossesCowiche Creek
Location03.01 W Sunset Way
RouteCounty Highway 24440
Coordinates46.66446, -120.8212
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.9 US tons
Inventory rating21.4 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckOther
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic202 (2021)
Projected traffic243 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$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cowiche Mill Rd. over Cowiche Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is Cowiche Mill Rd. over Cowiche Creek 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 Cowiche Mill Rd. over Cowiche Creek carry?

About 202 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Cowiche Mill Rd. over Cowiche Creek?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 32 ft wide.

Who owns Cowiche Mill Rd. over Cowiche Creek?

It is owned by the County Highway Agency.