US Bridges

US 12 over Walla Walla River

Fair

Walla Walla County, Washington · 12.0 E JCT SR 124 · Structure no. 000000MI0000000

Built
1953
72 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
369 ft
3 main spans
Daily traffic
8,735
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Walla Walla River is a steel stringer/multi-beam or girder carrying US 12 over Walla Walla River in Walla Walla County, Washington. It was built in 1953, so it is 72 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 8,735 vehicles a day, roughly 26% of them trucks, projected to reach 9,549 by 2039. The structure is 369 ft (112.5 m) long and 36 ft wide. If it were closed, the detour would be 29.2 mi (47 km).

Location

Open in Google Maps
CarriesUS 12
CrossesWalla Walla River
Location12.0 E JCT SR 124
RouteU.S. Route 12
CountyWalla Walla County
StateWashington
Coordinates46.06061, -118.90939
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
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 rating27 US tons
Inventory rating16 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length369 ft (112.5 m)
Longest span123 ft (37.5 m)
Deck width36 ft (11 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,735 (2023)
Projected traffic9,549 by 2039
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed29.2 mi (47 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$8.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Walla Walla River built?

It was built in 1953, making it 72 years old in 2025.

What condition is US 12 over Walla Walla 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 March 2024.

How much traffic does US 12 over Walla Walla River carry?

About 8,735 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is US 12 over Walla Walla River?

The structure is 369 ft (112.5 m) long with a longest span of 123 ft (37.5 m) and a deck 36 ft wide.

Who owns US 12 over Walla Walla River?

It is owned by the State Highway Agency.