US Bridges

SR 507 over Centralia Power Canal

Good

Thurston County, Washington · 2.3 N JCT SR 510 · Structure no. 000000RG0000000

Built
1954
71 years old
Condition
Good
inspected August 2023
Type
Culvert
Concrete
Length
33 ft
2 main spans
Daily traffic
22,357
2023 count
Owner
State
State Highway Agency

About this bridge

SR 507 over Centralia Power Canal is a concrete culvert carrying SR 507 over Centralia Power Canal in Thurston County, Washington. It was built in 1954, so it is 71 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.

It carries about 22,357 vehicles a day, roughly 5% of them trucks, projected to reach 32,844 by 2039. The structure is 33 ft (10.1 m) long. If it were closed, the detour would be 47.2 mi (76 km).

CarriesSR 507
CrossesCentralia Power Canal
Location2.3 N JCT SR 510
RouteState Highway 507
Coordinates46.93219, -122.56334
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,357 (2023)
Projected traffic32,844 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed47.2 mi (76 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$658,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 507 over Centralia Power Canal built?

It was built in 1954, making it 71 years old in 2025.

What condition is SR 507 over Centralia Power 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 2023.

How much traffic does SR 507 over Centralia Power Canal carry?

About 22,357 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SR 507 over Centralia Power Canal?

The structure is 33 ft (10.1 m) long with a longest span of 15 ft (4.6 m).

Who owns SR 507 over Centralia Power Canal?

It is owned by the State Highway Agency.