US Bridges

Wilkensen Road over Centralia Canal

Good

Thurston County, Washington · .3 M N of Norpacif RD · Structure no. 082157000000000

Built
1986
39 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
5,357
2021 count
Owner
County
County Highway Agency

About this bridge

Wilkensen Road over Centralia Canal is a prestressed concrete stringer/multi-beam or girder carrying Wilkensen Road over Centralia Canal in Thurston County, Washington. It was built in 1986, so it is 39 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,357 vehicles a day, roughly 15% of them trucks, projected to reach 8,281 by 2043. The structure is 60 ft (18.3 m) long and 35 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesWilkensen Road
CrossesCentralia Canal
Location.3 M N of Norpacif RD
RouteCounty Highway 15600
CountyThurston County
StateWashington
Coordinates46.9563, -122.59004
Functional classUrban 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span58 ft (17.7 m)
Deck width35 ft (10.8 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,357 (2021)
Projected traffic8,281 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$1.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Wilkensen Road over Centralia Canal built?

It was built in 1986, making it 39 years old in 2025.

What condition is Wilkensen Road over Centralia Canal 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 August 2024.

How much traffic does Wilkensen Road over Centralia Canal carry?

About 5,357 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is Wilkensen Road over Centralia Canal?

The structure is 60 ft (18.3 m) long with a longest span of 58 ft (17.7 m) and a deck 35 ft wide.

Who owns Wilkensen Road over Centralia Canal?

It is owned by the County Highway Agency.