US Bridges

US 12 over Naches River

Fair

Yakima County, Washington · 13.2 E JCT SR 410 · Structure no. 0007874A0000000

Built
1966
59 years old
Condition
Fair
inspected July 2024
Type
Truss - Thru
Steel
Length
314 ft
1 main span
Daily traffic
9,476
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Naches River is a steel truss - thru carrying US 12 over Naches River in Yakima County, Washington. It was built in 1966, so it is 59 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 9,476 vehicles a day, roughly 12% of them trucks, projected to reach 11,960 by 2039. The structure is 314 ft (95.7 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 12
CrossesNaches River
Location13.2 E JCT SR 410
RouteU.S. Route 12
CountyYakima County
StateWashington
Coordinates46.63219, -120.58686
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation7: Better than 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 rating54 US tons
Inventory rating32 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length314 ft (95.7 m)
Longest span302 ft (92 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic9,476 (2023)
Projected traffic11,960 by 2039
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$6.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Naches River built?

It was built in 1966, making it 59 years old in 2025.

What condition is US 12 over Naches River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.

How much traffic does US 12 over Naches River carry?

About 9,476 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 12 over Naches River?

The structure is 314 ft (95.7 m) long with a longest span of 302 ft (92 m) and a deck 35 ft wide.

Who owns US 12 over Naches River?

It is owned by the State Highway Agency.