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<br />CHAPTER I <br /> <br />INTRODUCTION <br /> <br />major streams of the area, and seven concrete chutes are used to <br />drop the canal in elevation. A 2, 389-foot-Iong, 6. 25-foot-diameter <br />horseshoe tunnel carries the canal water through a ridge on the <br />divide between Salt and Tea Creeks, eliminating canal construction <br />through a badly eroded area. <br /> <br />Bonham Dam and Reservoir <br /> <br />Bonham Dam is located on Grand Mesa, 12 miles south of Collbran. <br />The dam consists of two embankments separated by an intervening <br />knoll. Reclamation's rehabilitation in 1962 added earth and <br />rockfill material to the crest and downstream face, raising the <br />crest 2 feet. This allows a 4-foot freeboard above the normal <br />reservoir water surface. The completed embankment structure is <br />1,500 feet in length, has a 25-foot-wide crest, and has a maximum <br />height of 38 feet. The spillway was rehabilitated and now has a <br />capacity of 1,830 cubic feet per second. <br /> <br />Bonham Reservoir has an active capacity of 1,222 acre-feet. A <br />power water outlet works consists of a 750-foot-inlet channel, <br />intake structure to a 36-inch-inside-diameter, a steel-lined <br />conduit, and a gate structure with a 36-inch cast-iron slide gate. <br />The 36-inch steel-lined conduit is reduced to a 33-inch-inside- <br />diameter~~ steel-lined pipe where it becomes the Bonham pipeline at <br />a manhole structure about 100 feet downstream from the gate <br />structure. <br /> <br />East Fork Diversion Dam and Feeder Canal <br /> <br />The East Fork Diversion Dam and Feeder Canal divert the natural <br />flow of the East Fork of Big Creek and releases from Atkinson and <br />Lambert Reservoirs to Bonham Reservoir. The East Fork Diversion <br /> <br />8 <br />