US Bridges

US 12 over Walla Walla R

Fair

Walla Walla County, Washington · 6.3 E JCT US 730 Spur · Structure no. 0000302A0000000

Built
1917
108 years old, rebuilt 1933
Condition
Fair
inspected October 2024
Type
Arch - Deck
Concrete Continuous
Length
226 ft
3 main spans
Daily traffic
8,169
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Walla Walla R is a concrete continuous arch - deck carrying US 12 over Walla Walla R in Walla Walla County, Washington. It was built in 1917 and reconstructed in 1933, so it is 108 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 5 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 8,169 vehicles a day, roughly 14% of them trucks, projected to reach 8,981 by 2039. The structure is 226 ft (68.9 m) long and 32 ft wide. If it were closed, the detour would be 29.2 mi (47 km).

Location

Open in Google Maps
CarriesUS 12
CrossesWalla Walla R
Location6.3 E JCT US 730 Spur
RouteU.S. Route 12
CountyWalla Walla County
StateWashington
Coordinates46.07216, -118.78579
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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating59 US tons
Inventory rating45.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 15
Structure length226 ft (68.9 m)
Longest span76 ft (23.2 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,169 (2023)
Projected traffic8,981 by 2039
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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$4.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Walla Walla R built?

It was built in 1917, making it 108 years old in 2025. It was reconstructed in 1933.

What condition is US 12 over Walla Walla R 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 October 2024.

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

About 8,169 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is US 12 over Walla Walla R?

The structure is 226 ft (68.9 m) long with a longest span of 76 ft (23.2 m) and a deck 32 ft wide.

Who owns US 12 over Walla Walla R?

It is owned by the State Highway Agency.