. Water Supply and Irrigation Papers of the United States Geological Survey . of the White and Yampa rivers in Colorado. In the 41,000 square miles which comprise the total drainage areaof the Green River, there are considerably over 5,000 square miles oftimbered land in addition to a considerable woodland area. The prin-cipal species of mountain timber are the Engelmann spruce and lodge-pole pine. Over the plains portion of the basin, which includes considerablyover half of it, the average annual precipitation seems to be less than10 inches annually; over much of the remainder the rainfall av
. Water Supply and Irrigation Papers of the United States Geological Survey . of the White and Yampa rivers in Colorado. In the 41,000 square miles which comprise the total drainage areaof the Green River, there are considerably over 5,000 square miles oftimbered land in addition to a considerable woodland area. The prin-cipal species of mountain timber are the Engelmann spruce and lodge-pole pine. Over the plains portion of the basin, which includes considerablyover half of it, the average annual precipitation seems to be less than10 inches annually; over much of the remainder the rainfall averagesbetween 10 and 15 inches, and in only a very small area in the highmountains does the precipitation exceed 20 inches annually. Throughout this whole basin winters are severe, and most of thestreams have a heavy ice cover for several months. There is usuallyan abundance of snow in the high mountains, but the winters on theplains are frequently quite open. (See PI. IV, A and B.) a See also description of New Fork drainage basin in Water-Supply Paper 175, pp. 21 and
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