Engineering Feasibility of Long Draw Reservoir Enlargement

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WRIGHT- M&AUGHLIN ENGINEERS 1240 W. BAYAUD AVENUE DENVER, COLORADO 80223 PHONE 744 -6271 WOODWARD- CLYDE- SHERARD & ASSOCIATES 2909 W. 7TH AVENUE DENVER, COLORADO 80204 PHONE 222 -9434 A JOINT VENTURE 20 July 1966 The Board of Directors Water Supply and Storage Company East of Fort Collins Fort Collins, Colorado 80521 Gentlemen: Re. Lcng Draw Reservoir Enlargement The attached report presents results of our investigations and analyses of the engineering feasibility of enlarging Long Draw Reservoir located in the upper reaches of the Cache La Poudre. It has been concluded that the most economical enlargement would be to a total capacity of 10,800 acre feet, which is an increase in storage capacity of 6,400 acre feet. This would regUire raising of the dam from a 60 foot height to an 82 foot height, from elevation 10,073 feet to 10,095 feet. The investigation has shown that the existing darn needs substantial work performed on it even if the new addition is not made. Ravelling and seepage have occurred on the downstream face of the dam, if the enlargement was made, there would be no need for any additional rehabili- tation work on the dam other than that made as a part of new construction. The estimated cost of the Long Draw Dam enlargement as planned is $405,000, which represents a unit cost of about $65 per acre foot. This is a very low cost for storage. We know of no other po ±ential storage sites on the Poudre which would approach this unit cost. Based upon our past work for the Company which resulted in detailed reports in September, 1964, and August of 1965, and upon our investiga- tions of the Long Draw Reservoir enlargement, we are of the opinion that the Water Supply and Storage Company should undertake the raising of Long Draw Dam as presented in this report. Very truly yours, Kenneth R. Wright am A. Clevenger