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<br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />In addition, records of the eight translllOuntain diversions <br />from the Colorado, Michigan and Ie.ramie River Basins are available <br />throughout the period of study. <br /> <br />RecordS of cana.l diversions above the "Cache la l'oudre River <br />at Mouth of Oanyon near Fort Collins" gaging station were obtained <br />from the Water CollllJlissioner of District No.3. <br /> <br /> <br />Correlations were used to expand the available str~-now <br />data to cover the entire study period. The primary correlation <br />was made' us:l,ng the Elkhorn gage with the concurrent recordS of the <br />two Rustic gages. <br /> <br />The Mountain Supply Area <br /> <br />The headwaters of the Cache le. Poudre River and the South Fork <br />Cache le. Poudre are centered high in the Mummy Range of Oolorado' s <br />Rocky Mounte.irts. Hauges Peak, 13,560 feet, in Rocky Mountain <br />National Park is the highest point in the drainage basin. <br /> <br />Much of the runoff of the Cache la Poudre basin resuJ.ts from Arc. <br />the melting of snow acc1.llllUlated during the winter at the higher ele~ Jqq Sj JrJ, , <br />vations. At the IdylWllde site, 80 percent of the average annual-- <br />runoff occurs: in May, June and July. Recorded discharge during <br />spring runoff reached a maxilllUlll of 3,610 cfs while minimums of 15 to <br />20 cfs have been recorded during the winter. An average of 189,500 <br />acre-feet of water flows past the Idylwilde site each year, ranging <br />from 109,000 acre-feet in 195* (estimated), to 263,400 acre-feet in <br />1957, (recorded). <br /> <br />The drainage area of the North Fork of the Cache la Poudre <br />comprises 566 square miles extending northward into Albany County, <br />Wyoming. The .area consists mainly of forested and grass-covered <br />foothills. The historic annual runoff of the North Fork. drainage, <br />adjusted for tra.nsmountain imports and the North Poudre Cana.l <br />diversions, averages 61.,400 acre-feet. The North Fork area occa- <br />sionally produCes flash floods which have high peak discharges and <br />cornpa.ratively low volumes. Maximum recorded discharge in the North <br />Fork is 6,800cfs, although an estimated peak discharge of 20,000 cfs <br />occurred in 1904. <br /> <br />There are eight transmountain diversions that import annually <br />an average of 42,200 acre-feet of water into the Cache le. Poudre <br />l3asin. The six transmountain diversions located above the Idy1wi1.de <br />site import a yearly average o:f' 39,200 acre-:f'eet. These are the <br />Grand River Ditch diverting from the Colorado River; the Cameron Pass <br /> <br />13 <br />