has to be stocked by the Wisconsin Department of Natural Resources at the Bark River Hatchery in Fort Atkinson with Walleye and Northern pike. There are four boat landings around the lake for people to use and also two beaches. The Lake is very shallow averaging around 6 feet with a maximum depth of 7 feet, but you can still boat, canoe, and kayak here. Events hosted on the lake range from boat races to Venetian Boat Parades. Thunder on the Lake is a high speed boat race that has been held on Lake Koshkonong. The boats are hydroplane powered and can reach speeds up to 60 MPH. Other boat races are also held for fishing boats, and other smaller boats. The Venetian Boat Parade is put on by the Rock Koshkonong Business Association. Participants are encouraged to dress up their boat with lights and decorations of their choosing and cruise along with one another ending at the Lakeview bar. Winter attractions Ice fishing and ice racing used to be much more common, but due to warmer weather in the past few years the activity has not been as popular. Other winter activities practiced on and around the lake include snowmobiling, fatbike riding, and ice skating. Environmental concerns Erosion The loss of aquatic plant biodiversity and rising water levels on the lake due to flooding has caused significant erosion over the past 50 years. The shoreline has been impacted greatly by such events, and projects to reverse and prevent more damage from occurring have been done. Riprap armor has been used to prevent future erosion, but it is mostly a short term fix where human made rock formations are placed along the shoreline to protect against scour and waves. In 2002 and 2003 the Rock Koshkonong Lake District (RKLD) teamed up with wetland owners to protect around 40% or almost 5 miles of the shoreline with riprap armor. Incorporating breakwater structures has also been talked about as a potential fix to the erosion problem. Water quality Lake koshkonong is known for its tinted green color which is caused by algae and nutrient runoff from the Rock River. The lake is classified as hypereutrophic because it is extremely rich in nutrients and the water is shallow. The transparency of the water is low and algal blooms occur frequently, causing this classification. A lake will be classified as hypereutophic if it has