Rock Lake Health Report, 2025

Water Level Management
-View the new Water Level Order  ⇒   ⇒  ⇒   ⇒   ⇒   ⇒   ⇒   ⇒   ⇒   ⇒   ⇒
-Lake Level Data from the City Dam site.

Beach Water Quality: For information on Beach Water Quality and Swimming, see: Beach Safety for Human Health

Harmful Algal Blooms in Wisconsin’s Lakes…they may look like thick paint floating on the water and frequently give off a foul odor… Further information on Blue-Green Algae blooms are at: https://www.dhs.wisconsin.gov/water/bg-algae/index.htm

Swimmer’s Itch; is neither dangerous nor contagious, but it is very uncomfortable.

Rock Lake Clean Boats, Clean Waters – see how many people were contacted and what lakes they came from; data from 2016 to 2025.

Check these Boating Safety Tips put together by the Joint Rock Lake Committee

Add a Shoreland Garden or Rain Garden to your Rock Lake property! Check the Healthy Lakes website (http://healthylakeswi.com/) and contact Colton Hutchinson at the Jefferson County Land and Water Conservation Department for next steps and financial assistance (chutchinson@jeffersoncountywi.gov  920-674-7111).

View the ‘Lake Lot 101 Workshop’ featuring experts that address a variety of concerns about our lake’s shoreline.   ⇒   ⇒   ⇒   ⇒   ⇒   ⇒   ⇒   ⇒   ⇒

Leaves left in the street release phosphorus/nutrients which end up in Rock Lake. Learn about this problem and what you can do.

View the presentation of Agricultural Work in the Rock Lake Watershed by Jefferson County’s Land and Water Conservation Department

“Welcome to Rock Lake” area information with a map, created by the Joint Rock Lake Committee.