US Bridges

US 12 over Patit Creek

Fair

Columbia County, Washington · 8.4 E Walla Wal CO · Structure no. 0001687C0000000

Built
1933
92 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Concrete
Length
44 ft
1 main span
Daily traffic
2,218
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Patit Creek is a concrete tee beam carrying US 12 over Patit Creek 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 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 2,218 vehicles a day, roughly 26% of them trucks, projected to reach 2,724 by 2039. The structure is 44 ft (13.4 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesUS 12
CrossesPatit Creek
Location8.4 E Walla Wal CO
RouteU.S. Route 12
CountyColumbia County
StateWashington
Coordinates46.32714, -117.97431
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating36.8 US tons
Inventory rating28.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length44 ft (13.4 m)
Longest span42 ft (12.8 m)
Deck width31 ft (9.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,218 (2023)
Projected traffic2,724 by 2039
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.2 mi (10 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$627,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Patit Creek built?

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

What condition is US 12 over Patit Creek 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 February 2023.

How much traffic does US 12 over Patit Creek carry?

About 2,218 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is US 12 over Patit Creek?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 31 ft wide.

Who owns US 12 over Patit Creek?

It is owned by the State Highway Agency.