Blackmans Lake
Blackmans Lake is located within the City of Snohomish, just east of Hwy 9. The area of the lake is 62.9 acres with an average depth of 14 feet. The watershed, or the land area that drains into the lake, covers 510.7 acres and about 50% of that land is developed.
Recreational Opportunities
- ADA Accessible
- Boat Launch
- Boating (No gasoline-powered motors)
- Fishing
- Lake Access
- Public Park
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
The Friends of Blackmans Lake is a Washington nonprofit corporation with the mission to understand and advocate for the health of Blackmans Lake. You can connect with the lake community through via email, or by looking for a Blackmans Lake community group on NextDoor or Facebook.Lake Health and Additional Resources
The City of Snohomish contracts with the Snohomish County's Lake Management Program, to conduct monthly water quality monitoring at Blackmans Lake. The lake has been monitored since 1992 as shown in the following reports and data: Health Report Card |
In Depth Health Report |
For more historical information on Blackmans Lake please refer to the 2003 State of the Lakes Report or the 1994 Blackmans Lake Phase I Restoration Study.
Lake Questions and Assistance
For information about the water quality of Blackmans Lake, please contact Snohomish County's lake program. For information about the management of the lake including lake level management, please contact the City of Snohomish. Toxic Algae Alerts
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Lakes experiencing toxic algae blooms are listed below and have been posted with WARNING signs. The WA State toxin testing program is closed for the winter, WARNING signs are posted when scum is present.
Updated 3/3/2021
BLACKMANS LAKE - intermittent blue-green algae blooms with green scum near the shoreline. Previous sample results show that Microcystin, a liver toxin, were detected at 22 ppb. This is above the WA state Recreational limits of 8 ppb. If you would like to sign up for alerts, please visit the City of Snohomish website and sign up for NewsFlash updates.
LAKE HOWARD - heavy blue-green algae bloom along the shoreline near the boat launch. Previous algae samples contained species known to produce liver toxins and neurotoxins.
LOST LAKE - intermittent blue-green algae bloom at the south end of the lake. Previous algae samples contained species known to produce liver toxins.
LAKE SHOECRAFT- intermittent blue-green algae bloom along the shorelines. Previous algae samples contained species known to produce neurotoxins.
Please follow the guidelines on the WARNING sign when recreating.
NEW - 2021 Lake Health Report Card Update
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Click on the "Health Report Card" link at the bottom of the page.
Contact Us
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Marisa Burghdoff
Water Quality Specialist
Ph: 425-388-3204
Jen Oden
Water Quality Specialist
Ph: 425-262-2601
Katie Ruthenberg
Water Quality Analyst
Ph: 425-262-2907
email us at lakes@snoco.org