US Bridges

Kirby-Mayview over So Deadman Creek

FairPosted for load

Garfield County, Washington · 4.0 N JCT SR 12 · Structure no. 084691000000000

Built
1957
68 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
234
2020 count
Owner
County
County Highway Agency

About this bridge

Kirby-Mayview over So Deadman Creek is a concrete slab carrying Kirby-Mayview over So Deadman Creek in Garfield County, Washington. It was built in 1957, so it is 68 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. Its operating status is: posted for other load-capacity restriction.

It carries about 234 vehicles a day, roughly 40% of them trucks, projected to reach 280 by 2040. The structure is 22 ft (6.7 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesKirby-Mayview
CrossesSo Deadman Creek
Location4.0 N JCT SR 12
RouteCounty Highway 41000
Coordinates46.48056, -117.41511
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.1 US tons
Inventory rating25.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic234 (2020)
Projected traffic280 by 2040
Trucks40%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$314,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Kirby-Mayview over So Deadman Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is Kirby-Mayview over So Deadman 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 August 2024.

How much traffic does Kirby-Mayview over So Deadman Creek carry?

About 234 vehicles per day (2020 count), of which roughly 40% are trucks.

How long is Kirby-Mayview over So Deadman Creek?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 31 ft wide.

Who owns Kirby-Mayview over So Deadman Creek?

It is owned by the County Highway Agency.