Rock Lake Rock Lake is a borderline high-quality mesotrophic lake. It has been the focus of long-term trend monitoring since 1986. This increased fertility may lead to more algae blooms. The lake was chemically treated in the past to control excessive aquatic plant growth, but this management practice has decreased due to potential harm to fish habitat. The lake has a diverse sport fishery supporting both smallmouth and largemouth bass, walleye, northern pike and panfish.
Polluted runoff is the greatest threat to Rock Lake.
Residential development along the shoreline and backlot development adjacent to the lake have recently accelerated. Agricultural runoff carrying excess nutrients to the lake also contributes to water quality concerns. A lake planning grant was recently awarded to the Rock Lake Improvement Association to gather information to develop an overall lake management plan. Other lake planning grants may be needed to address other issues.