US Bridges

US 12 over Tieton River

Good

Yakima County, Washington · 26.0 E Lewis CO · Structure no. 0017743B0000000

Built
2010
15 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
247 ft
2 main spans
Daily traffic
2,324
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Tieton River is a prestressed concrete continuous stringer/multi-beam or girder carrying US 12 over Tieton River in Yakima County, Washington. It was built in 2010, so it is 15 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,324 vehicles a day, roughly 22% of them trucks, projected to reach 2,700 by 2039. The structure is 247 ft (75.3 m) long and 35 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesUS 12
CrossesTieton River
Location26.0 E Lewis CO
RouteU.S. Route 12
Coordinates46.69516, -120.91437
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable 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 rating81 US tons
Inventory rating48.9 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length247 ft (75.3 m)
Longest span159 ft (48.6 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,324 (2023)
Projected traffic2,700 by 2039
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Tieton River built?

It was built in 2010, making it 15 years old in 2025.

What condition is US 12 over Tieton River 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 October 2024.

How much traffic does US 12 over Tieton River carry?

About 2,324 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is US 12 over Tieton River?

The structure is 247 ft (75.3 m) long with a longest span of 159 ft (48.6 m) and a deck 35 ft wide.

Who owns US 12 over Tieton River?

It is owned by the State Highway Agency.