US Bridges

Skagit Key over Coal Creek

Good

King County, Washington · 0.06 West JCT Cascade Key · Structure no. 088968000000000

Built
2017
8 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
33 ft
1 main span
Daily traffic
340
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Skagit Key over Coal Creek is a concrete stringer/multi-beam or girder carrying Skagit Key over Coal Creek in King County, Washington. It was built in 2017, so it is 8 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 340 vehicles a day, roughly 9% of them trucks, projected to reach 340 by 2040. The structure is 33 ft (10.1 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSkagit Key
CrossesCoal Creek
Location0.06 West JCT Cascade Key
RouteCity Street 7533
Coordinates47.56961, -122.18314
Functional classUrban Local

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 protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.6 US tons
Inventory rating38.3 US tons

Structure

MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length33 ft (10.1 m)
Longest span25 ft (7.6 m)
Deck width48 ft (14.6 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic340 (2022)
Projected traffic340 by 2040
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$549,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Skagit Key over Coal Creek built?

It was built in 2017, making it 8 years old in 2025.

What condition is Skagit Key over Coal 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 2024.

How much traffic does Skagit Key over Coal Creek carry?

About 340 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Skagit Key over Coal Creek?

The structure is 33 ft (10.1 m) long with a longest span of 25 ft (7.6 m) and a deck 48 ft wide.

Who owns Skagit Key over Coal Creek?

It is owned by the City or Municipal Highway Agency.