Lakes are a critical freshwater resource providing an array of recreational opportunities, valuable habitat for fish and wildlife, and tranquil beauty. Our geologic history has led this area to be rich in lakes with Snohomish County having over 400 lakes. While the majority are very small or located in the Cascade mountains, there are around 60 lakes located in the populated lowland areas.
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.
BLACKMANS
LAKE
1/7/2021 - Blackmans Lake is experiencing intermittent blue-green algae blooms with
green scum near the shoreline. Previous sample results how 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.
Please follow the guidelines on the WARNING sign when recreating.