US Bridges

US 12 over Pacific P L Tailrace

Good

Yakima County, Washington · 7.5 E JCT SR 410 · Structure no. 0001843A0000000

Built
1934
91 years old
Condition
Good
inspected September 2023
Type
Slab
Concrete Continuous
Length
72 ft
3 main spans
Daily traffic
5,794
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Pacific P L Tailrace is a concrete continuous slab carrying US 12 over Pacific P L Tailrace in Yakima County, Washington. It was built in 1934, so it is 91 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 5,794 vehicles a day, roughly 11% of them trucks, projected to reach 7,533 by 2039. The structure is 72 ft (21.9 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 12
CrossesPacific P L Tailrace
Location7.5 E JCT SR 410
RouteU.S. Route 12
Coordinates46.69634, -120.65405
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.4 US tons
Inventory rating19.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length72 ft (21.9 m)
Longest span25 ft (7.6 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,794 (2023)
Projected traffic7,533 by 2039
Trucks11%
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$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Pacific P L Tailrace built?

It was built in 1934, making it 91 years old in 2025.

What condition is US 12 over Pacific P L Tailrace 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 September 2023.

How much traffic does US 12 over Pacific P L Tailrace carry?

About 5,794 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US 12 over Pacific P L Tailrace?

The structure is 72 ft (21.9 m) long with a longest span of 25 ft (7.6 m) and a deck 33 ft wide.

Who owns US 12 over Pacific P L Tailrace?

It is owned by the State Highway Agency.