US Bridges

148th Ave SE over Soos Creek

Fair

King County, Washington · 0.25 MI N of SE 256th ST · Structure no. 082938000000000

Built
1971
54 years old
Condition
Fair
inspected April 2024
Type
Channel Beam
Concrete
Length
30 ft
1 main span
Daily traffic
2,300
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

148th Ave SE over Soos Creek is a concrete channel beam carrying 148th Ave SE over Soos Creek in King County, Washington. It was built in 1971, so it is 54 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 2,300 vehicles a day, roughly 5% of them trucks, projected to reach 4,100 by 2039. The structure is 30 ft (9.1 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries148th Ave SE
CrossesSoos Creek
Location0.25 MI N of SE 256th ST
RouteCity Street 615
CountyKing County
StateWashington
Coordinates47.37473, -122.1442
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
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.7 US tons
Inventory rating30.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span25 ft (7.6 m)
Deck width38 ft (11.6 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,300 (2019)
Projected traffic4,100 by 2039
Trucks5%
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 148th Ave SE over Soos Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is 148th Ave SE over Soos 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 April 2024.

How much traffic does 148th Ave SE over Soos Creek carry?

About 2,300 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is 148th Ave SE over Soos Creek?

The structure is 30 ft (9.1 m) long with a longest span of 25 ft (7.6 m) and a deck 38 ft wide.

Who owns 148th Ave SE over Soos Creek?

It is owned by the City or Municipal Highway Agency.