US Bridges

US 12 over Myra RD

Fair

Walla Walla County, Washington · 27.7 E JCT US 730 Spur · Structure no. 0017474A0000000

Built
2009
16 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
110 ft
1 main span
Daily traffic
2,382
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Myra RD is a prestressed concrete stringer/multi-beam or girder carrying US 12 over Myra RD in Walla Walla County, Washington. It was built in 2009, so it is 16 years old, younger 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 2,382 vehicles a day, roughly 11% of them trucks, projected to reach 2,814 by 2039. The structure is 110 ft (33.5 m) long and 41 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 12
CrossesMyra RD
Location27.7 E JCT US 730 Spur
RouteU.S. Route 12
CountyWalla Walla County
StateWashington
Coordinates46.06986, -118.37006
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98 US tons
Inventory rating58 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length110 ft (33.5 m)
Longest span107 ft (32.6 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,382 (2023)
Projected traffic2,814 by 2039
Trucks11%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$2.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 12 over Myra RD built?

It was built in 2009, making it 16 years old in 2025.

What condition is US 12 over Myra RD 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 Myra RD carry?

About 2,382 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is US 12 over Myra RD?

The structure is 110 ft (33.5 m) long with a longest span of 107 ft (32.6 m) and a deck 41 ft wide.

Who owns US 12 over Myra RD?

It is owned by the State Highway Agency.