Lost Lake

Lost Lake (formerly called Devil's Lake) is located southeast of Maltby between Highway 522 and the Snohomish-King County line. The lake is 13.2 acres with a maximum depth of 45 feet. The watershed, or the land area that drains into the lake, covers 156.9 acres.

Recreational Opportunities

  • Boat Launch
  • Boating (No gasoline-powered motors)
  • Fishing
  • Parking
  • Restrooms/Sanicans
There is a public boat launch located on the southwest side of the lake, as shown on the bathymetric maps below. Internal combustion motors are not allowed on Lake Armstrong - see Snohomish County Code Title 12 and the Parks and Recreation Boating Regulations for more information.

Fishing Information

The Washington Department of Fish and Wildlife (WDFW) maintains informational pages for each lake in Washington that include: fish stocking schedules, fishing prospect calendars, and boat launch information.


Connect with Your Lake Community

Lost Lake does not have a formal lake association. However, you may be able to connect with other lake area residents by looking for a Lost Lake community group on NextDoor or Facebook.

Lake Health and Additional Resources

As part of Snohomish County's Lake Management Program, County staff and volunteer lake monitors have been tracking the health of Lost Lake since 1992. 

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Health Report Card

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In Depth Health Report

In Depth Lake Health Report

​For more historical information on Lost Lake please refer to the 2003 State of the Lakes Report.

​Maps​

View maps of Lost Lake and the surrounding area, including the location of public access sites.


Watershed Map
Area that drains to the lake

Bathymetry Map
Depth contours of the lake

Aerial Bathymetry Map
Depth contours of the lake with satellite images