Advisory updates and other information to encourage safe recreation

October 18th 2024

NO CURRENT ADVISORY

• Battle Ground Lake
• Klineline Pond
• Round Lake*
• Vancouver Lake

There are no current advisories at these lakes. To report a suspected harmful algal bloom or other water quality concern, go here.

*Algae bloom is present and being monitored. Please exercise caution and avoid areas of scum.

WARNING ADVISORY

• Lacamas Lake (Issued 8/28/24)



A WARNING Advisory has been issued due to increased levels of toxins:

• Swimming or water skiing not advised anywhere on lake. 
•  Avoid areas of scum when using motorized boats, paddle boarding, kayaking or canoeing. 
• Do not drink lake water. 
• Animals should avoid all water contact.  
• When fishing, clean fish well and discard organs. 

Next Sampling Dates

• E.coli (bacteria): May 2025
• Harmful Algae (cyanobacteria): October 21st 2024

We talk a lot about cyanobacteria (harmful algae) blooms that occur on the surface of the water, often presenting as a bright green layer. However, there is another type of toxin-producing cyanobacteria called benthic cyanobacteria that form as mats at the bottom of a lake or river.

Benthic mats are most often green, brown, or gold in color. They can appear as clumps of vegetation, slime layers, carpeting, and gelatinous masses. They can be confused with the stringier filamentous green algae. Benthic mats can grow very quickly, and appear both on the river bottom and floating freely.

Benthic mats can break free from their anchor point and wash ashore. Typically green or brown, they dry out on the shoreline and present a risk as they are much more accessible. If mats are observed on the shoreline, do not touch them and keep pets away - they are possibly toxic.

To stay up to date on our harmful algal bloom monitoring, follow us on Facebook or Twitter.

Our weekly newsletter updates will continue through Labor Day 2024, our monitoring of blooms will continue through this fall. Follow us on Facebook and Twitter for advisory updates.

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Clark County Public Health | clark.wa.gov/public-health

1601 E. Fourth Plain Blvd, Building 17

Vancouver, WA 98661