In 1880, which we will accept as the starting point as a background for this problem and about which time government surveys were made, we find over five thousand bodies of water of sufficient size to be classed as lakes. At present there may be one thousand sloughs. Devils Lake which originally had an area of 125 square miles and a depth of 35 feet now has an area of less than 30 square miles and a depth of less than 7 feet. Minnesota lakes which drain into the Ottertail and thence into the Red River have receded, without exception, from two to ten feet. Among these lakes are Ottertail, Rush, Big Pine, Little Pine, Height of Land, Round, Many Point, Little Bemidji, Flat and Egg Lakes. The Bois de Sioux river which joins the Ottertail at Breckenridge, Minnesota, and which formerly carried a considerable flow of water throughout the year, is now dry except during a short period of the spring run-off. The Sheyenne River in North Dakota which empties into the Red below Fargo has in late years been known to be only a series of puddles. This river, which we will refer to again, rises in the central western part of the state, approximately due north of Bismarck, the state capitol. The Wild Rice river which feeds the Red River above Fargo has, for the past few years, been entirely dry except during short periods of spring run-off. The Red Lake River rising in Minnesota and flowing into the Red River at Grand Forks and supplying Grand Forks and East Grand Forks with water has been
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