US Bridges

SE 304th ST over Soosette Creek

Good

King County, Washington · 0.1 E JCT SR 18 · Structure no. 0014776E0000000

Built
1997
28 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
580 ft
3 main spans
Daily traffic
11,963
2016 count
Owner
State
State Highway Agency

About this bridge

SE 304th ST over Soosette Creek is a steel stringer/multi-beam or girder carrying SE 304th ST over Soosette Creek in King County, Washington. It was built in 1997, so it is 28 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,963 vehicles a day, roughly 1% of them trucks, projected to reach 18,735 by 2038. The structure is 580 ft (176.8 m) long and 43 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSE 304th ST
CrossesSoosette Creek
Location0.1 E JCT SR 18
RouteCounty Highway 18
CountyKing County
StateWashington
Coordinates47.33021, -122.15652
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating72 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length580 ft (176.8 m)
Longest span240 ft (73.2 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,963 (2016)
Projected traffic18,735 by 2038
Trucks1%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$11.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SE 304th ST over Soosette Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is SE 304th ST over Soosette 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 May 2023.

How much traffic does SE 304th ST over Soosette Creek carry?

About 11,963 vehicles per day (2016 count), of which roughly 1% are trucks.

How long is SE 304th ST over Soosette Creek?

The structure is 580 ft (176.8 m) long with a longest span of 240 ft (73.2 m) and a deck 43 ft wide.

Who owns SE 304th ST over Soosette Creek?

It is owned by the State Highway Agency.