The lake and its shorelines
The Kahshe & Bass Lakes Association, known until 2024 as the Kahshe Lake Ratepayers’ Association, is the association for cottage owners on Kahshe and Bass lakes (Kahshe & Bass Lakes Association, n.d.-a). The association gives the lake’s area as 828 hectares, its maximum depth as 21 metres and its shoreline, including islands, as 85.3 kilometres (Kahshe & Bass Lakes Association, n.d.-b).
The District of Muskoka monitors lakes through its Lake System Health program, and Kahshe Lake’s two stations, Grant’s Bay and Main, were on its 2025 monitoring schedule (District Municipality of Muskoka, n.d., 2025). In 2021 the District proposed adding Kahshe Lake to its Official Plan list of vulnerable waterbodies; the lakes proposed had confirmed blue-green algal blooms in 2019 and/or 2020 (District Municipality of Muskoka, 2021). The association reports that the lake remains on that list (Kahshe & Bass Lakes Association, n.d.-c).
Which municipality a property sits in also matters day to day: it sets the zoning, issues building permits, and sets the municipal share of property tax. On Kahshe Lake that is the Town of Gravenhurst.