US Bridges

US 12 over Coppei Creek

Good

Walla Walla County, Washington · 21.3 E JCT SR 125 Spur · Structure no. 0016988A0000000

Built
2005
20 years old
Condition
Good
inspected May 2023
Type
Slab
Prestressed Concrete
Length
69 ft
1 main span
Daily traffic
3,567
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over Coppei Creek is a prestressed concrete slab carrying US 12 over Coppei Creek in Walla Walla County, Washington. It was built in 2005, so it is 20 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 3,567 vehicles a day, roughly 12% of them trucks, projected to reach 4,437 by 2039. The structure is 69 ft (21 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesUS 12
CrossesCoppei Creek
Location21.3 E JCT SR 125 Spur
RouteU.S. Route 12
CountyWalla Walla County
StateWashington
Coordinates46.26242, -118.15336
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 protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
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 rating99 US tons
Inventory rating61 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length69 ft (21 m)
Longest span68 ft (20.7 m)
Deck width36 ft (11 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,567 (2023)
Projected traffic4,437 by 2039
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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$1.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over Coppei Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is US 12 over Coppei 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 May 2023.

How much traffic does US 12 over Coppei Creek carry?

About 3,567 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 12 over Coppei Creek?

The structure is 69 ft (21 m) long with a longest span of 68 ft (20.7 m) and a deck 36 ft wide.

Who owns US 12 over Coppei Creek?

It is owned by the State Highway Agency.