US Bridges

Sightly Road over Outlet Creek

Fair

Cowlitz County, Washington · 0.03 S SR 504 (mp 10.53) · Structure no. 087203000000000

Built
1956
69 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
600
2020 count
Owner
County
County Highway Agency

About this bridge

Sightly Road over Outlet Creek is a concrete continuous culvert carrying Sightly Road over Outlet Creek in Cowlitz County, Washington. It was built in 1956, so it is 69 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 600 vehicles a day, roughly 14% of them trucks, projected to reach 800 by 2040. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesSightly Road
CrossesOutlet Creek
Location0.03 S SR 504 (mp 10.53)
RouteCounty Highway 58990
CountyCowlitz County
StateWashington
Coordinates46.32389, -122.73222
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating82 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 15
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2020)
Projected traffic800 by 2040
Trucks14%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sightly Road over Outlet Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is Sightly Road over Outlet Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does Sightly Road over Outlet Creek carry?

About 600 vehicles per day (2020 count), of which roughly 14% are trucks.

How long is Sightly Road over Outlet Creek?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns Sightly Road over Outlet Creek?

It is owned by the County Highway Agency.