US Bridges

252nd Ave SE over Boise Creek

Fair

King County, Washington · 0.1 S of SR-410 · Structure no. 083493000000000

Built
1963
62 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
43 ft
1 main span
Daily traffic
650
2019 count
Owner
County
County Highway Agency

About this bridge

252nd Ave SE over Boise Creek is a concrete stringer/multi-beam or girder carrying 252nd Ave SE over Boise Creek in King County, Washington. It was built in 1963, so it is 62 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 650 vehicles a day, projected to reach 890 by 2039. The structure is 43 ft (13.1 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries252nd Ave SE
CrossesBoise Creek
Location0.1 S of SR-410
RouteCounty Highway 30230
CountyKing County
StateWashington
Coordinates47.18546, -122.00548
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span37 ft (11.3 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic650 (2019)
Projected traffic890 by 2039
Trucks0%
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$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 252nd Ave SE over Boise Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is 252nd Ave SE over Boise 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 July 2023.

How much traffic does 252nd Ave SE over Boise Creek carry?

About 650 vehicles per day (2019 count).

How long is 252nd Ave SE over Boise Creek?

The structure is 43 ft (13.1 m) long with a longest span of 37 ft (11.3 m) and a deck 30 ft wide.

Who owns 252nd Ave SE over Boise Creek?

It is owned by the County Highway Agency.