Lake Tahoe Swimming Events Donner Lake Swimming Events The SIERRA plays host to some of the world’s clearest and cleanest fresh water lakes. Each year we host open water swimming events in Lake Tahoe and Donner Lake. Tahoe City Swim Saturday June 25, 2022 Register Here Tahoe City Swim 2022 Alpine Fresh Water Swim Sunday July 24, 2022 Register Here Alpine Fresh Water Swim 2022 Lake Tahoe Open Water Swim Sunday August 28, 2022 Register Here Lake Tahoe Swim 2022 Please visit our Sponsors.