We camped here while trying to find climbing and skiing in the North Cascades, which are sublime, but challenging when as hot as it was. The towns of Mazama and Winthrop are figuratively but not literally cool, and with temperatures rising over 110 during the record heatwave of July 2021, the lake was a lovely place to cool down. It was much milder in temperature than the still frigid but fantastic Methow River, and perfect for casual swimming at sunset. Many families and campers but still found a spot and slept well for the first night in may hot ones.