US Bridges

Powerline RD over Olson Creek

FairPosted for load

King County, Washington · Powerline RD · Structure no. 088219000000000

Built
1900
125 years old
Condition
Fair
inspected August 2022
Type
Girder and Floorbeam System
Steel
Length
66 ft
1 main span
Daily traffic
25
2022 count
Owner
Local
Other Local Agency

About this bridge

Powerline RD over Olson Creek is a steel girder and floorbeam system carrying Powerline RD over Olson Creek in King County, Washington. It was built in 1900, so it is 125 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. Its operating status is: posted for load restriction.

It carries about 25 vehicles a day, roughly 5% of them trucks, projected to reach 35 by 2042. The structure is 66 ft (20.1 m) long and 18 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesPowerline RD
CrossesOlson Creek
LocationPowerline RD
CountyKing County
StateWashington
Coordinates48.53959, -121.44395
Functional classRural Local

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.
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 protection8 Very GoodNo problems noted.
Last inspectionAugust 2022
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating8.3 US tons
Inventory rating6.4 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length66 ft (20.1 m)
Longest span66 ft (20.1 m)
Deck width18 ft (5.5 m)
Roadway width17 ft (5.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2022)
Projected traffic35 by 2042
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$564,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Powerline RD over Olson Creek built?

It was built in 1900, making it 125 years old in 2025.

What condition is Powerline RD over Olson 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 August 2022.

How much traffic does Powerline RD over Olson Creek carry?

About 25 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Powerline RD over Olson Creek?

The structure is 66 ft (20.1 m) long with a longest span of 66 ft (20.1 m) and a deck 18 ft wide.

Who owns Powerline RD over Olson Creek?

It is owned by the Other Local Agency.