US Bridges

172nd Ave SE over Soos Creek

Good

King County, Washington · 1.7 MI N of SR-18 · Structure no. 088137000000000

Built
2009
16 years old
Condition
Good
inspected July 2023
Type
Slab
Prestressed Concrete
Length
37 ft
1 main span
Daily traffic
1,150
2023 count
Owner
County
County Highway Agency

About this bridge

172nd Ave SE over Soos Creek is a prestressed concrete slab carrying 172nd Ave SE over Soos Creek in King County, Washington. It was built in 2009, so it is 16 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 1,150 vehicles a day, roughly 2% of them trucks, projected to reach 1,400 by 2043. The structure is 37 ft (11.3 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries172nd Ave SE
CrossesSoos Creek
Location1.7 MI N of SR-18
RouteCounty Highway 13370
CountyKing County
StateWashington
Coordinates47.38975, -122.11226
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.3 US tons
Inventory rating60.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length37 ft (11.3 m)
Longest span35 ft (10.7 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,150 (2023)
Projected traffic1,400 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 172nd Ave SE over Soos Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is 172nd Ave SE over 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 July 2023.

How much traffic does 172nd Ave SE over Soos Creek carry?

About 1,150 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is 172nd Ave SE over Soos Creek?

The structure is 37 ft (11.3 m) long with a longest span of 35 ft (10.7 m) and a deck 28 ft wide.

Who owns 172nd Ave SE over Soos Creek?

It is owned by the County Highway Agency.