sentences:  Some recreational facilities, such as the boat launch facility on the lake's north-east corner, have been rendered inaccessible by the high water levels, and very little visible beach sand remains at the Pickerel Point or Ministik swimming areas.The variable water level has also caused other recent changes to the lake.At the time of lowest water level in the late 1970s, the lake's largest island, Spruce Island, was connected by dry land to the mainland, and a large gravel bar in the lake's north basin was exposed.