US Bridges

US 12 over Whetstone Creek

Good

Columbia County, Washington · 13.0 E Walla Wal CO · Structure no. 0019606A0000000

Built
2021
4 years old
Condition
Good
inspected November 2023
Type
Slab
Prestressed Concrete
Length
37 ft
1 main span
Daily traffic
1,993
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Whetstone Creek is a prestressed concrete slab carrying US 12 over Whetstone Creek in Columbia County, Washington. It was built in 2021, so it is 4 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,993 vehicles a day, roughly 27% of them trucks, projected to reach 2,304 by 2039. The structure is 37 ft (11.2 m) long and 37 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesUS 12
CrossesWhetstone Creek
Location13.0 E Walla Wal CO
RouteU.S. Route 12
Coordinates46.38108, -117.93919
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating101.7 US tons
Inventory rating66.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length37 ft (11.2 m)
Longest span33 ft (10 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,993 (2023)
Projected traffic2,304 by 2039
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$629,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Whetstone Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is US 12 over Whetstone Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

How much traffic does US 12 over Whetstone Creek carry?

About 1,993 vehicles per day (2023 count), of which roughly 27% are trucks.

How long is US 12 over Whetstone Creek?

The structure is 37 ft (11.2 m) long with a longest span of 33 ft (10 m) and a deck 37 ft wide.

Who owns US 12 over Whetstone Creek?

It is owned by the State Highway Agency.