Lake Cassidy

Lake Cassidy is located north of Lake Stevens and three miles east of Marysville. The lake covers 131.0 acres and has an average depth of 11 feet. The watershed, or the land area that drains into the lake, covers 2,649.6 acres and about 18% of the land is developed.

Recreational Opportunities

  • Boat Launch
  • Boating (Electric or Motorized - 8 mph max; 10 hp max) 
  • Fishing
  • Lake Access
Snohomish County Park's Centennial Trail runs along the eastern shoreline and includes the Lake Cassidy Wetlands Park & Interpretive Trail. The Wetlands Park includes a fishing dock and limited disabled parking for those with the gate access code. To obtain the access code, complete and submit the application form.

There is a public boat launch located on the southwest shore. Power boats are permitted but only with a maximum speed of 8 mph and a maximum horsepower of 10. See the 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

Lake Cassidy does not have a formal lake association. However, you may be able to connect with other lake area residents by looking for a Lake Cassidy 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 Lake Cassidy since 1992. 

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Health Report Card

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In Depth Health Report

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Lake Cassidy Historic Reports:

2003 State of the Lakes Report

1998 Cassidy Warmwater Fish Survey





View maps of Lake Cassidy 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
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