US Bridges

Old Naches over Wapatox Canal

Good

Yakima County, Washington · 00.79 W Cleman DR · Structure no. 084226000000000

Built
1918
107 years old
Condition
Good
inspected December 2022
Type
Culvert
Concrete
Length
60 ft
1 main span
Daily traffic
260
2020 count
Owner
County
County Highway Agency

About this bridge

Old Naches over Wapatox Canal is a concrete culvert carrying Old Naches over Wapatox Canal in Yakima County, Washington. It was built in 1918, so it is 107 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 260 vehicles a day, roughly 5% of them trucks, projected to reach 400 by 2040. The structure is 60 ft (18.3 m) long and 27 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesOld Naches
CrossesWapatox Canal
Location00.79 W Cleman DR
RouteCounty Highway 15650
Coordinates46.74642, -120.74652
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating65.7 US tons
Inventory rating39.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length60 ft (18.3 m)
Longest span58 ft (17.7 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic260 (2020)
Projected traffic400 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Naches over Wapatox Canal built?

It was built in 1918, making it 107 years old in 2025.

What condition is Old Naches over Wapatox Canal 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 December 2022.

How much traffic does Old Naches over Wapatox Canal carry?

About 260 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Old Naches over Wapatox Canal?

The structure is 60 ft (18.3 m) long with a longest span of 58 ft (17.7 m) and a deck 27 ft wide.

Who owns Old Naches over Wapatox Canal?

It is owned by the County Highway Agency.