US Bridges

NE 128th Way over Cottage Lake Creek

Fair

King County, Washington · 0.1 MI W of Avondale RD · Structure no. 084121000000000

Built
1975
50 years old
Condition
Fair
inspected August 2024
Type
Culvert
Steel
Length
35 ft
1 main span
Daily traffic
14,586
2020 count
Owner
County
County Highway Agency

About this bridge

NE 128th Way over Cottage Lake Creek is a steel culvert carrying NE 128th Way over Cottage Lake Creek in King County, Washington. It was built in 1975, so it is 50 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 14,586 vehicles a day, roughly 11% of them trucks, projected to reach 26,345 by 2040. The structure is 35 ft (10.7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNE 128th Way
CrossesCottage Lake Creek
Location0.1 MI W of Avondale RD
RouteCounty Highway 96830
CountyKing County
StateWashington
Coordinates47.71558, -122.09033
Functional classUrban Other Principal Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.5 US tons
Inventory rating55 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span35 ft (10.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,586 (2020)
Projected traffic26,345 by 2040
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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 NE 128th Way over Cottage Lake Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is NE 128th Way over Cottage Lake 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 August 2024.

How much traffic does NE 128th Way over Cottage Lake Creek carry?

About 14,586 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is NE 128th Way over Cottage Lake Creek?

The structure is 35 ft (10.7 m) long with a longest span of 35 ft (10.7 m).

Who owns NE 128th Way over Cottage Lake Creek?

It is owned by the County Highway Agency.