US Bridges

Slide Creek RD over Abernathy Creek

GoodPosted for load

Cowlitz County, Washington · 0.05 W Abernathy RD (1.13 · Structure no. 084562000000000

Built
1952
73 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
71 ft
3 main spans
Daily traffic
163
2022 count
Owner
County
County Highway Agency

About this bridge

Slide Creek RD over Abernathy Creek is a wood or timber stringer/multi-beam or girder carrying Slide Creek RD over Abernathy Creek in Cowlitz County, Washington. It was built in 1952, so it is 73 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: posted for load restriction.

It carries about 163 vehicles a day, roughly 35% of them trucks, projected to reach 150 by 2042. The structure is 71 ft (21.6 m) long and 22 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSlide Creek RD
CrossesAbernathy Creek
Location0.05 W Abernathy RD (1.13
RouteCounty Highway 21010
Coordinates46.20583, -123.15361
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating20.9 US tons
Inventory rating16 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadHS 15
Structure length71 ft (21.6 m)
Longest span40 ft (12.2 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic163 (2022)
Projected traffic150 by 2042
Trucks35%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedReplacement because of relocation of road
Estimated improvement cost$2.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Slide Creek RD over Abernathy Creek built?

It was built in 1952, making it 73 years old in 2025.

What condition is Slide Creek RD over Abernathy 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 2024.

How much traffic does Slide Creek RD over Abernathy Creek carry?

About 163 vehicles per day (2022 count), of which roughly 35% are trucks.

How long is Slide Creek RD over Abernathy Creek?

The structure is 71 ft (21.6 m) long with a longest span of 40 ft (12.2 m) and a deck 22 ft wide.

Who owns Slide Creek RD over Abernathy Creek?

It is owned by the County Highway Agency.