Martha Lake (South)

Martha Lake (referred to as “Martha South”) is located just east of Interstate 5 between Lynnwood and Mill Creek. The lake is 61.6 acres in size and has a maximum depth of 48 feet. Martha Lake’s watershed, or the land area that drains to the lake, covers 437.7 acres and is largely developed.

Recreational Opportunities

  • Fishing
  • Boating (No gasoline-powered motors)
  • Wetland Boardwalk
  • Picnic Shelters
  • Playground
  • Restrooms/Sanicans
Internal combustion motors are not allowed on Lake Martha (North) - 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

Martha Lake (South) does not have a formal lake association. However, you may be able to connect with other lake area residents by looking for a Martha Lake (South) 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 Martha Lake (South) since 1990. 

Health Report Card

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In Depth Health Report

In Depth Lake Health Report

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View maps of Martha Lake (South) 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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