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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Ov?lCJ4 <br /> <br />LOWER YAMPA SUBBASIN <br /> <br />Location and Description <br />The Lower Yampa Subbasin includes the drainage <br />basin of the Yampa River downstream from the U. S. Geo- <br />logical Survey Maybell gaging station, exclusive of the <br />Little Snake River, the drainage basin of Vermilion Creek <br />in Colorado, a tributary to the Green River, and the small <br />watershed area in the vicinity of the junction of the <br />Yampa River with the Green which drains to the Green River. <br />The subbasin is located entirely within Moffat County. <br />Although much of the subbasin watershed is at <br />an altitude of between 6,500 and 7,500 feet with mountain <br />peaks of over 9,000 feet, the annual precipitation and <br />resultant watershed runoff is low. The streams of the <br />subbasin including that of Vermilion Creek are intermittent. <br /> <br />Watershed Runoff <br />Since the streams of the subbasin are ungaged <br />without any record of runoff, the water yield information <br />as used in this report consists of estimates largely based <br />on watershed area and precipitation. For the 18-year <br />report period the average annual subbasin yield was esti- <br />mated to be 61,700 acre feet. This amount, less the annual <br />stream depletion of 3,900 acre feet, gives 57,800 acre feet <br />as the probable historic runoff of the subbasin. <br /> <br />16 <br /> <br />..ll <br />