US Bridges

284th Ave. SE over Newaukum Creek

Good

King County, Washington · 1.0 MI W of SR-169 · Structure no. 088538000000000

Built
2012
13 years old
Condition
Good
inspected July 2023
Type
Slab
Prestressed Concrete
Length
35 ft
1 main span
Daily traffic
2,855
2019 count
Owner
County
County Highway Agency

About this bridge

284th Ave. SE over Newaukum Creek is a prestressed concrete slab carrying 284th Ave. SE over Newaukum Creek in King County, Washington. It was built in 2012, so it is 13 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 2,855 vehicles a day, roughly 5% of them trucks, projected to reach 5,155 by 2039. The structure is 35 ft (10.7 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries284th Ave. SE
CrossesNewaukum Creek
Location1.0 MI W of SR-169
RouteCounty Highway 93655
CountyKing County
StateWashington
Coordinates47.23173, -121.96293
Functional classRural Major Collector

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.
Substructure7 GoodSome minor problems.
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 evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating62.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length35 ft (10.7 m)
Longest span30 ft (9.1 m)
Deck width38 ft (11.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,855 (2019)
Projected traffic5,155 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

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$1.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 284th Ave. SE over Newaukum Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is 284th Ave. SE over Newaukum 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 284th Ave. SE over Newaukum Creek carry?

About 2,855 vehicles per day (2019 count), of which roughly 5% are trucks.

How long is 284th Ave. SE over Newaukum Creek?

The structure is 35 ft (10.7 m) long with a longest span of 30 ft (9.1 m) and a deck 38 ft wide.

Who owns 284th Ave. SE over Newaukum Creek?

It is owned by the County Highway Agency.