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 24, 2023 Register Here Tahoe City Swim 2023 Alpine Fresh Water Swim Sunday July 23, 2023 Register Here Alpine Fresh Water Swim 2023 Lake Tahoe Open Water Swim Sunday August 27, 2023 Register Here Lake Tahoe Open Water swim 2023 Please visit our Sponsors.