US Bridges

384th Ave SE over Kimball Creek

Fair

King County, Washington · 1.0 MI N of I-90 · Structure no. 084184000000000

Built
1971
54 years old
Condition
Fair
inspected July 2024
Type
Culvert
Steel
Length
27 ft
1 main span
Daily traffic
2,930
2020 count
Owner
County
County Highway Agency

About this bridge

384th Ave SE over Kimball Creek is a steel culvert carrying 384th Ave SE over Kimball 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 6 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 2,930 vehicles a day, roughly 5% of them trucks, projected to reach 4,000 by 2040. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries384th Ave SE
CrossesKimball Creek
Location1.0 MI N of I-90
RouteCounty Highway 98953
CountyKing County
StateWashington
Coordinates47.51811, -121.82847
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.8 US tons
Inventory rating106.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length27 ft (8.2 m)
Longest span25 ft (7.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,930 (2020)
Projected traffic4,000 by 2040
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$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 384th Ave SE over Kimball Creek built?

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

What condition is 384th Ave SE over Kimball 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 July 2024.

How much traffic does 384th Ave SE over Kimball Creek carry?

About 2,930 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is 384th Ave SE over Kimball Creek?

The structure is 27 ft (8.2 m) long with a longest span of 25 ft (7.5 m).

Who owns 384th Ave SE over Kimball Creek?

It is owned by the County Highway Agency.