My favourite lake for surfing and foiling is ten times higher, 5873 ft. Lake Silvaplana. Today the first snow has fallen
This lake is at 5,700 ft. We sail on a lake at 6k in the afternoons, and sometimes hit up the 7500 ft lakes as well. In fact, hit up a lake in Wyoming where it was 80 degrees (and heavy forest fire smoke), and snow on it today.