US Bridges

US 12 over Warehouse Yard

Poor

Columbia County, Washington · 8.2 E Walla Wal CO · Structure no. 0001687B0000000

Built
1933
92 years old
Condition
Poor
inspected February 2023
Type
Tee Beam
Concrete
Length
263 ft
6 main spans
Daily traffic
2,442
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Warehouse Yard is a concrete tee beam carrying US 12 over Warehouse Yard in Columbia County, Washington. It was built in 1933, so it is 92 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 2,442 vehicles a day, roughly 25% of them trucks, projected to reach 3,144 by 2039. The structure is 263 ft (80.2 m) long and 33 ft wide.

Location

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CarriesUS 12
CrossesWarehouse Yard
Location8.2 E Walla Wal CO
RouteU.S. Route 12
CountyColumbia County
StateWashington
Coordinates46.32525, -117.97267
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length263 ft (80.2 m)
Longest span54 ft (16.5 m)
Deck width33 ft (10.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,442 (2023)
Projected traffic3,144 by 2039
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesOther
Detour if closed—
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)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 12 over Warehouse Yard built?

It was built in 1933, making it 92 years old in 2025.

What condition is US 12 over Warehouse Yard in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2023.

How much traffic does US 12 over Warehouse Yard carry?

About 2,442 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is US 12 over Warehouse Yard?

The structure is 263 ft (80.2 m) long with a longest span of 54 ft (16.5 m) and a deck 33 ft wide.

Who owns US 12 over Warehouse Yard?

It is owned by the State Highway Agency.