US Bridges

Duck Lake RD over Duck Creek

Fair

Lincoln County, Washington · 04.30 NE SR 21 · Structure no. 083014000000000

Built
1972
53 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete
Length
40 ft
1 main span
Daily traffic
186
2020 count
Owner
County
County Highway Agency

About this bridge

Duck Lake RD over Duck Creek is a concrete tee beam carrying Duck Lake RD over Duck Creek in Lincoln County, Washington. It was built in 1972, so it is 53 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 186 vehicles a day, roughly 40% of them trucks, projected to reach 285 by 2040. The structure is 40 ft (12.2 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesDuck Lake RD
CrossesDuck Creek
Location04.30 NE SR 21
RouteCounty Highway 92310
CountyLincoln County
StateWashington
Coordinates47.37897, -118.63672
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.4 US tons
Inventory rating27.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckOther
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span38 ft (11.6 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic186 (2020)
Projected traffic285 by 2040
Trucks40%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Duck Lake RD over Duck Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is Duck Lake RD over Duck 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 November 2023.

How much traffic does Duck Lake RD over Duck Creek carry?

About 186 vehicles per day (2020 count), of which roughly 40% are trucks.

How long is Duck Lake RD over Duck Creek?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.6 m) and a deck 32 ft wide.

Who owns Duck Lake RD over Duck Creek?

It is owned by the County Highway Agency.