The Vashon Island Hydros have been a 4th of July tradition for over 40 years. This non-sanctioned event has been one of the great little underground events that has gone fairly un-noticed. Bring your lawn chairs down to Jensen Point, EARLY to see them go and to see them come in after doing a lap around Vashon Island. Here is a great read about the tradition of the Vashon Island Hydros by Brian Brenno: https://myvashonislandblog.com/2020/05/30/vashons-hydro-heritage/