US Bridges

SR 506 over Campbell Creek

Good

Cowlitz County, Washington · 0.9 E JCT Second ST · Structure no. 0006575A0000000

Built
1960
65 years old
Condition
Good
inspected November 2023
Type
Slab
Concrete Continuous
Length
76 ft
3 main spans
Daily traffic
541
2023 count
Owner
State
State Highway Agency

About this bridge

SR 506 over Campbell Creek is a concrete continuous slab carrying SR 506 over Campbell Creek in Cowlitz County, Washington. It was built in 1960, so it is 65 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 541 vehicles a day, roughly 5% of them trucks, projected to reach 641 by 2039. The structure is 76 ft (23.3 m) long and 30 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 506
CrossesCampbell Creek
Location0.9 E JCT Second ST
RouteState Highway 506
CountyCowlitz County
StateWashington
Coordinates46.38556, -123.04253
Functional classRural Major Collector

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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length76 ft (23.3 m)
Longest span30 ft (9.1 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic541 (2023)
Projected traffic641 by 2039
Trucks5%
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

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$1.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 506 over Campbell Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is SR 506 over Campbell 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 November 2023.

How much traffic does SR 506 over Campbell Creek carry?

About 541 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SR 506 over Campbell Creek?

The structure is 76 ft (23.3 m) long with a longest span of 30 ft (9.1 m) and a deck 30 ft wide.

Who owns SR 506 over Campbell Creek?

It is owned by the State Highway Agency.