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' 6 <br />' Irrigation season flows at this gage, which is above the headgate of the <br />Minnesota Canal and Turner Ditch are shown below. <br />Flow in Acre Feet per Month <br />Month Low Average High <br />' May 3890 6597 9340 <br />June 2480 4282 7330 <br />July 716 1484 2170 <br />August 421 807 1150 <br />September 213 416 755 <br />October 247 376 1020 <br />Beaver Reservoir on East Fork Minnesota Creek and Monument Reservoir on Dry <br />Fork alter the seasonal flows of Minnesota Creek. Under present operation, <br />Beaver Reservoir, which was built in the mid 50's, controls about 1000 AF <br />annually and Monument Reservoir controls approximately 500 AF annually. In <br />addition, there is a transbasin diversion into Minnesota Creek (Dry Fork) <br />via the Deep Creek Ditch. <br />WECC installed stream gage flumes on Dry Fork, Lick, South Prong, and Horse <br />creeks in 1971 and has collected data from these stations from 1977 to <br />~~ present. <br />URY FORK HYDROLOGY <br />Dry Fork is a tributary drainage of Minnesota Creek with a basin area of <br />] 7.69 square miles, of which 6.83 square miles are within the mine boundary, <br />and 5.75 square miles are above the area to be mined. It has been monitored <br />1 by two stream gages, upper Dry Fork and Lower Dry Fork, since 1977. The <br />l lower gage has a drainage area of 1.49 square miles or 18 percent of the <br />Minnesota Creek basin above the Turner Ditch. <br />1 Average annual unit run-off from the Dry Fork basin is about 130 AF/square <br />mile, which is only about a third of the average for the entire Minnesota <br />Creek basin. This can be partly accounted for by its lower elevation and <br />to wer annual precipitation. Adjusting for Monument Reservoir and Deep Creek <br />transbasin diversion, the peak snowmelt runoff occurs earlier than in the <br />rest of the Minnesota basin, with the major run-off (50 percent) occurring <br />• in May. Nearly 90 percent of the Dry Fork flow occurs from April through <br />1 July. It drains approximately 18 percent of the Minnesota Creek basin <br />1 (above the Minnesota Creek gage) while contributing only about 6 percent of <br />1 the flow. Dry Fork is aptly named. <br />