Naval Auxiliary Air Facility ditched and sank near Raymond on 16 August 1943. Two low-flying British Vought Corsairs from Brunswick were lost after a mid-air collision over the lake near Raymond on 16 May 1944; and a third Corsair flew into the lake on July 16. In December 2014 a yellow Piper PA-18 Super Cub monoplane landed on a Sebago Lake beach, in what some believe is the first landing of a plane on Sebago beaches. Water supply Sebago Lake is the primary water supply for the Portland Water District, which serves the Greater Portland region and about 20% of Maine's population. The lake's watershed is more than long and covers parts of 24 Maine towns. The lake holds roughly of water that on average resides 5.1 to 5.4 years in the lake. The direct watershed is about of land plus the of the lake, and the indirect watershed about of land plus about of other bodies of water. As of May 1990, roughly 86% of the watershed was forests and fallow fields, 2.5% in active timber operations, 9.3% in residential, agricultural, and commercial use, and 2.2% used for other purposes. Water inflow is estimated at per day and outflow at per day, of which /day are for the water district. Recreation In 1938, the state of Maine purchased and opened Sebago Lake State Park as one of its original five state parks. However, the area was known as a public recreation center even before this. The park is now (mostly forested), open year-round, and has facilities including two public boat launches and a 250-site campground. There are also numerous private beach clubs and campgrounds spread around the lake, such as Point Sebago in Casco, which contains numerous cottages and facilities that can be rented out to guests. Sebago Lake hosts a sailing instruction and charter service and is located in what Maine's tourism industry refers to as the Western Lakes and Mountains Region. Efforts are underway to complete the Sebago to the Sea Trail, a trail running 28 miles from Sebago Lake to Casco Bay, mostly following the path of the Presumpscot River. Fishing The lake is the likely point of origin of the landlocked salmon, stated in the species' scientific name (Salmo salar sebago). At one point, the entire watershed was under seawater, and the first populations of these marine animals became established as the land rose and