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. Col/bran Project ~q..1 J . '0 Vega Dam and Reservoir )nthside Canal )uthside Canal heads at the outlet works 01 Vega Reser- }ir and conveys irrigation water westward from the 'servoir to project lands. The 32.8-mile-long canal has n initial capacity of 240 cubic feet per second and a ter~ tinal capacity of 50 cubic feet per second at Mesa :reek. Thirteen siphons carry the canal across major Teams of the area, and seven concrete chutes are sed to drop the canal in elevation. A 2.389-loot-long, .25-foot-diameter horseshoe tunnel carries the canal 'ater through a ridge on the divide between Salt and 'ea Creeks, eliminating canal construction through a adly eroded area. 'onham Dam and Reservoir :onham Dam is located on Grand Mesa, 12 miles south f Collbran. The dam consists of two embankments eparated by an intervening knoll. Reclamation rehabili- ation in 1962 added earth and rockfill material to the rest and downstream face, raising the crest 2 feet. This tHows a 4-foot freeboard above the normal reservoir vater surface. The completed structure is 1,500 feet in ength, has a 25.loot-wide crest, and is 38 feet high. The pillway was rehabilitated and now has a capacity of ,830 cubic feet per second. Bonham Reservoir has a total capacity of 1,222 acre~feet. It has been in operation for more than 50 years. The Bonham power water outlet works consists of a 750~foot inlet channel, intake structure to a 36-inch-inside- diameter, steel-lined conduit, and a gate structure with a 36-inch cast-iron slide gate. The 36-inch steel-lined con- duit is reduced to a 33-inch-inside-diameter, steel-lined pipe where it becomes the Bonham pipeline at a manhole structure about 100 feet downstream from the gate structure. East Fork Diversion Dam and Feeder Canal The East Fork Diversion Dam and Feeder Canal divert the natural flow 01 the East Fork of Big Creek and releases from Atkinson and Lambert Reservoirs to Bonham Reservoir. The East Fork Diversion Dam is a concrete ogee, gravity-type structure with overflow sec- tion and wingwalls of concrete and embankments of com- pacted earth at each end 01 the dam. The concrete head- works are controlled by one 3-foot-square slide gate, feeding the canal. The sluiceway is controlled by a 6~foot-square radial gate. The East Fork Feeder Canal, with a capacity 01 30 cubic feet per second, has a length of 1.3 miles. The first mile conveys water from East Fork to Atkinson Creek; the