Metrowest Daily News 5/26/10: Diver, DASH boat attack milfoil in Lake Cochituate. It may not be much to look at, but the platform on a floating pontoon near Cochituate State Park's boat ramp has made a dent over the past few days in the lake's invasive milfoil. The craft, known as a diver-assisted suction harvester or DASH boat, has been hired through a collaboration between the Department of Conservation and Recreation (DCR), the Natick Conservation Commission and a citizens group called the Lake Cochituate Watershed Council.