Between Memorial Day and Labor Day, Public Health routinely monitors local designated swim beaches for bacterial contaminants and harmful algal blooms. Other water bodies are monitored if we receive reports of unsafe conditions such as sewage spill or algal bloom. If there are elevated levels of bacteria or toxins from an algal bloom, advisory signs will be posted at the lake. Advisories are updated as conditions change. Below are the most current advisories as of today. 

For information about our sampling and advisory decisions, please view our advisory protocol.

Tips:

• When hovering over a regional icon, click the “Zoom to” link to get detailed advisory information for lakes in that area. Close out of the textbox once zoomed in.
• Click the home icon in the upper left-hand corner, this will take you back to the original map view.

Benthic algae mats

Benthic algae mats have been identified along the shoreline of the Columbia River in Clark County. The mats can contain toxins that can make people and pets sick and can be fatal to pets. More information about benthic algae mats is available on the lake advisories resources webpage.

Clark County Public Health has identified possible benthic algae mats at the following locations. Public Health is not routinely monitoring these locations; the dates represent when Public Health most recently identified the algae at the location: