US Bridges

218th Ave NE over Colin Creek

Fair

King County, Washington · 1 MI East of Avondale · Structure no. 086331000000000

Built
1984
41 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
2,300
2021 count
Owner
County
County Highway Agency

About this bridge

218th Ave NE over Colin Creek is a prestressed concrete tee beam carrying 218th Ave NE over Colin Creek in King County, Washington. It was built in 1984, so it is 41 years old, younger 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 2,300 vehicles a day, projected to reach 2,550 by 2041. The structure is 32 ft (9.8 m) long and 33 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
Carries218th Ave NE
CrossesColin Creek
Location1 MI East of Avondale
RouteCounty Highway 66220
CountyKing County
StateWashington
Coordinates47.72451, -122.0484
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum 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 rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width33 ft (10.1 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,300 (2021)
Projected traffic2,550 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 218th Ave NE over Colin Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is 218th Ave NE over Colin 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 May 2023.

How much traffic does 218th Ave NE over Colin Creek carry?

About 2,300 vehicles per day (2021 count).

How long is 218th Ave NE over Colin Creek?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 33 ft wide.

Who owns 218th Ave NE over Colin Creek?

It is owned by the County Highway Agency.