US Bridges

Delameter RD over Delameter Creek

Fair

Cowlitz County, Washington · 0.91 W SR 411 (mp 11.33) · Structure no. 082114000000000

Built
1957
68 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
84 ft
3 main spans
Daily traffic
1,203
2019 count
Owner
County
County Highway Agency

About this bridge

Delameter RD over Delameter Creek is a concrete continuous slab carrying Delameter RD over Delameter Creek in Cowlitz County, Washington. It was built in 1957, so it is 68 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 5 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 1,203 vehicles a day, roughly 4% of them trucks, projected to reach 1,720 by 2040. The structure is 84 ft (25.6 m) long and 34 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesDelameter RD
CrossesDelameter Creek
Location0.91 W SR 411 (mp 11.33)
RouteCounty Highway 20901
CountyCowlitz County
StateWashington
Coordinates46.27167, -122.94194
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating20 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length84 ft (25.6 m)
Longest span28 ft (8.5 m)
Deck width34 ft (10.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,203 (2019)
Projected traffic1,720 by 2040
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed11.8 mi (19 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$3.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Delameter RD over Delameter Creek built?

It was built in 1957, making it 68 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 1,203 vehicles per day (2019 count), of which roughly 4% are trucks.

How long is Delameter RD over Delameter Creek?

The structure is 84 ft (25.6 m) long with a longest span of 28 ft (8.5 m) and a deck 34 ft wide.

Who owns Delameter RD over Delameter Creek?

It is owned by the County Highway Agency.