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<br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Ditch and the Michigan Ditch, diverting from the Michigan River; the <br />Skyline Ditch, the Laramie-Poudre Tunnel and the Bob Creek Ditch <br />diverting from the Laramie River. Two transbasin diversions--the <br />Oolumbine Ditch and the Wilson Supply Ditch--import an average of <br />3,000 acre-feet a year to the North Fork from the Laramie River. <br /> <br /> <br />Twenty-two reservoirs Witll a combined decreed capacity of <br />50,5ll acre-feet are located in the mountains of the Cache la Poudre <br />Basin above tort Collins. These range. j.!l ~ size (wate.r right ca.paci ty) <br />from 69 acre-feet (Bellaires !eke) to ~8 acre-feet (Halligan <br />Reservoir). !rhe historic operation ofc these reservoirs is reflected <br />ixi the stream gaging station records. The difficuJ.ties and expense <br />of operation .and maintenance has reduced the over-all effectiveness <br />and has led to near abandonment of some of these reserv01rs, particu- <br />larly the sma;uer ones. Due to t1me limitation and the relatively <br />small effect on the future basin water supply, any change 1n the <br />regula'tiory effect of the mountain reservoirs was not evaluated for <br />this reconnaissance report. <br /> <br />Below the confluence of the North Fork and the Cache la Poud.re <br />the riv&r flows through a short, narrow canyon before flowing int.o <br />the plains ar_ near the town of BelleView. Three diversions are <br />made from this reach of the river immediately above the "mouth of <br />canyon near Fort Collins In gaging station. These are the North <br />Poudre Suppq Ca.na.l. the City of Fort Collins pipe line, and the <br />Poudre Valley Canal, which divert a combined average of 58,500 acre- <br />feet per year. An additional diversion above the gage, the North <br />Poudre Ca.na.l.diverts 33,300 acre-feet yearly from the North Fork <br />near Livermore, Colorado. During the period of study, 1947-1960, <br />the average annual flow at the "mouth of canyon" gage was 233.300 <br />acre-feet which includes the imports and effects of reservoir <br />regulation above. <br /> <br />The proposed Grey Mountain Da.msite is located about a mile <br />upstream from this gaging station. The total water supply Slbove the <br />damsite is the recorded flow at the "mouth of canyon" gage adjusted <br />for the four diversions above the gage (91,800 acre-feet per year) <br />or an annual average of 325,100 acre-feet. This total supply is <br />termed Mountain Sup;t'1Y and represents the historic water suppq <br />available at Grey Mountain Da.msi te for use in the plains below. <br /> <br />A yearq SU!lllllarY of stream flow in the mountain area. is <br />presented in Table 1 with a description of columns in the <br />Explanatory Notes. <br /> <br />14 <br />