. Water Supply and Irrigation Papers of the United States Geological Survey . <.. pi UJ l- > o O uj ,1J SUN RIVER DRAINAGE BASTN. 53 The mountainous part of the basin is included in the Lewis andClark National Forest, and is heavily timbered. The plains sectionis treeless except for a few willows and cottonwoods along the mean annual rainfall varies from 12 inches in the plains regionto abonf 45 inches in the mountainous sections. The heaviest rain-fall occurs during the month of June, but the regular June floods arecaused by the melting snow in the mountains. During the grea
. Water Supply and Irrigation Papers of the United States Geological Survey . <.. pi UJ l- > o O uj ,1J SUN RIVER DRAINAGE BASTN. 53 The mountainous part of the basin is included in the Lewis andClark National Forest, and is heavily timbered. The plains sectionis treeless except for a few willows and cottonwoods along the mean annual rainfall varies from 12 inches in the plains regionto abonf 45 inches in the mountainous sections. The heaviest rain-fall occurs during the month of June, but the regular June floods arecaused by the melting snow in the mountains. During the greaterpart of the winter season all the streams are frozen over. Mucl of the land in the valley has been irrigated, and the ordinarysummer flow of the stream is practically all utilized. The UnitedStates Reclamation Service has started const ruction on an irrigationproject that will store the Hood water of Sun River and its tributariesand carry it to the higher bench lands at the north of the valley, where260,000 acres of irrigable laud can be reclaimed. (See PI. IV.) Anumber of res
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