Caution: Algae Observed in Portions of Lake Stevens

City of Lake Stevens advises caution due to algae observed in portions of Lake Stevens

The City of Lake Stevens is advising residents and visitors to use caution after algae was observed in localized areas of Lake Stevens, particularly near Davis Beach and a shallow cove on the west side of the lake near Springbrook Road.

City staff have been actively monitoring lake conditions and have consulted with freshwater algae experts from Snohomish and King Counties. Based on visual observations and expert review, the algae present appear to include cyanobacteria, which can sometimes produce toxins harmful to people and pets.

At this time, algae accumulation is limited to specific shallow, low-circulation areas where sunlight, calm water, and recent nutrient inputs can promote growth. The rest of the lake does not appear to be affected.

Public Guidance

As a precaution, the City is advising the public to follow the guidance: “When in doubt, stay out.”

Residents and visitors are encouraged to:

Avoid contact with algae or discolored water
Keep pets, especially dogs, out of the water in affected areas
Prevent pets from drinking lake water
Rinse skin and pets with clean water if contact occurs

Advisory signs are posted in affected areas, and information is available here through the WA State: https://www.nwtoxicalgae.org/

Why This Happens

Algae is a natural part of our lake that helps balance the ecosystem and feed the fish, and it includes varieties that are benign and others that can cause problems. Algae growth can increase following periods of heavy rainfall, which can wash nutrients into the lake, followed by sunny conditions that support growth. Shallow coves and swimming areas that have limited water movement are particularly susceptible.

Ongoing Monitoring

We routinely monitor the lake to use the best available information to make management decisions. The City coordinates with regional partners to best protect our community. We will continue to update the community as we learn more information.

City Commitment to Lake Health

Protecting Lake Stevens' water quality is a priority for the City. Through ongoing lake monitoring, stormwater management, and public education, the Environmental Programs Division works year-round to reduce pollution sources and respond quickly when conditions change.

Updates will be shared on the City’s website as conditions evolve.

For more information on algae and lake safety, visit: https://lakestevenswa.gov/746/Lake-Management

Questions? Email: EnvironmentalPrograms@lakestevenswa.gov or call Public Works at: 425-622-9403

Algae Warning Sign Algae Sign at Davies Beach