US Bridges

SR 506 over Olequa Creek

Good

Lewis County, Washington · 4.9 E Cowlitz CO · Structure no. 0011913A0000000

Built
1981
44 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
120 ft
1 main span
Daily traffic
1,623
2023 count
Owner
State
State Highway Agency

About this bridge

SR 506 over Olequa Creek is a prestressed concrete stringer/multi-beam or girder carrying SR 506 over Olequa Creek in Lewis County, Washington. It was built in 1981, so it is 44 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 1,623 vehicles a day, roughly 6% of them trucks, projected to reach 1,929 by 2039. The structure is 120 ft (36.6 m) long and 45 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSR 506
CrossesOlequa Creek
Location4.9 E Cowlitz CO
RouteState Highway 506
CountyLewis County
StateWashington
Coordinates46.40194, -122.96469
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 protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating59 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length120 ft (36.6 m)
Longest span115 ft (35.1 m)
Deck width45 ft (13.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,623 (2023)
Projected traffic1,929 by 2039
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$1.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 506 over Olequa Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is SR 506 over Olequa 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 Olequa Creek carry?

About 1,623 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is SR 506 over Olequa Creek?

The structure is 120 ft (36.6 m) long with a longest span of 115 ft (35.1 m) and a deck 45 ft wide.

Who owns SR 506 over Olequa Creek?

It is owned by the State Highway Agency.