US Bridges

108th Ave SE over SE 274th ST

Fair

King County, Washington · 27400 108th Ave SE · Structure no. 087148000000000

Built
1998
27 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Concrete
Length
159 ft
1 main span
Daily traffic
8,500
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

108th Ave SE over SE 274th ST is a concrete box beam or girders - multiple carrying 108th Ave SE over SE 274th ST in King County, Washington. It was built in 1998, so it is 27 years old, younger 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 8,500 vehicles a day, roughly 3% of them trucks, projected to reach 11,000 by 2039. The structure is 159 ft (48.5 m) long and 59 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries108th Ave SE
CrossesSE 274th ST
Location27400 108th Ave SE
RouteCity Street 615
CountyKing County
StateWashington
Coordinates47.35595, -122.19693
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.1 US tons
Inventory rating32.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length159 ft (48.5 m)
Longest span152 ft (46.3 m)
Deck width59 ft (18 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,500 (2024)
Projected traffic11,000 by 2039
Trucks3%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$2.9 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 108th Ave SE over SE 274th ST built?

It was built in 1998, making it 27 years old in 2025.

What condition is 108th Ave SE over SE 274th ST 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 April 2024.

How much traffic does 108th Ave SE over SE 274th ST carry?

About 8,500 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is 108th Ave SE over SE 274th ST?

The structure is 159 ft (48.5 m) long with a longest span of 152 ft (46.3 m) and a deck 59 ft wide.

Who owns 108th Ave SE over SE 274th ST?

It is owned by the City or Municipal Highway Agency.