From Trees to Tap: The Workings of a Working Watershed. Meet caretaker Will Hamilton and water systems manager Chad Hoffman for an educational tour of the Briggs Lake area (known as the Roche Harbor Watershed) which is a private forest providing water, wood, wildlife and recreation which is enjoyed by many islanders. Learn what makes this watershed and water treatment plant property so unique. Take the watershed tour, a distance of 1.25mi. and then walk .75 mi. or drive to a tour of the water treatment plant where liquid refreshments will be served. Terrain: grassy trails, level to downhill (no uphill). Rating: gentle. Dogs on leashes okay. Rain or shine. Meet and park at corner of Roche Harbor and West Valley Roads. Limited parking; please carpool if possible.