US Bridges

Delameter RD over Delameter Creek

Fair

Cowlitz County, Washington · 1.56 W SR411 (mp 11.33) · Structure no. 087288000000000

Built
1954
71 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
1,176
2019 count
Owner
County
County Highway Agency

About this bridge

Delameter RD over Delameter Creek is a concrete continuous culvert carrying Delameter RD over Delameter Creek in Cowlitz 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 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 1,176 vehicles a day, roughly 4% of them trucks, projected to reach 1,680 by 2040. The structure is 25 ft (7.6 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesDelameter RD
CrossesDelameter Creek
Location1.56 W SR411 (mp 11.33)
RouteCounty Highway 20901
CountyCowlitz County
StateWashington
Coordinates46.26861, -122.95389
Functional classRural Major 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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33 US tons
Inventory rating20 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 15
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,176 (2019)
Projected traffic1,680 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Delameter RD over Delameter Creek built?

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

What condition is Delameter RD over Delameter 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 2023.

How much traffic does Delameter RD over Delameter Creek carry?

About 1,176 vehicles per day (2019 count), of which roughly 4% are trucks.

How long is Delameter RD over Delameter Creek?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 33 ft wide.

Who owns Delameter RD over Delameter Creek?

It is owned by the County Highway Agency.