US Bridges

SE 261st Street over Little Soos Creek

Good

King County, Washington · 0.5 MI N of SR-18 · Structure no. 087785000000000

Built
2006
19 years old
Condition
Good
inspected October 2024
Type
Culvert
Concrete
Length
54 ft
1 main span
Daily traffic
350
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

SE 261st Street over Little Soos Creek is a concrete culvert carrying SE 261st Street over Little Soos Creek in King County, Washington. It was built in 2006, so it is 19 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 350 vehicles a day, projected to reach 500 by 2039. The structure is 54 ft (16.5 m) long. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSE 261st Street
CrossesLittle Soos Creek
Location0.5 MI N of SR-18
RouteCity Street 293
Coordinates47.36806, -122.11536
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length54 ft (16.5 m)
Longest span54 ft (16.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2019)
Projected traffic500 by 2039
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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$2.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SE 261st Street over Little Soos Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is SE 261st Street over Little Soos Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

How much traffic does SE 261st Street over Little Soos Creek carry?

About 350 vehicles per day (2019 count).

How long is SE 261st Street over Little Soos Creek?

The structure is 54 ft (16.5 m) long with a longest span of 54 ft (16.5 m).

Who owns SE 261st Street over Little Soos Creek?

It is owned by the City or Municipal Highway Agency.