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' oy COLORADO Allen Lake and Lake Isabelle Repair Project <br /> CO Colorado Water Left Hand Ditch Com <br /> Conservation BoardPan y <br /> Substantially Complete June 1, 2016 <br /> Allen Lake <br /> Fadden lake <br /> •Mt AmWoo xJ <br /> Lake Isabelle *Aril <br /> , '° <br /> H <br /> x,owa Vewx.. Wad,N'' <br /> 2 <br /> n X M.,:tn MOIMt,,n <br /> MenlowSsery <br /> ,' 'si 'ANI ' Boulder <br /> +- . Mum <br /> ma <br /> r. i <br /> Aillif <br /> Project Description <br /> The Left Hand Ditch Company diverts water from Left Hand and St. Vrain creeks to provide irrigation water for <br /> a 15,000-acre service area in Boulder County. The water delivery system includes an elaborate network of <br /> ditches, laterals, reservoirs and headgates. Two of the Company's five reservoirs, Lake Isabelle and Allen <br /> Lake, were the subject of the CWCB loan request. Lake Isabelle lies within the Indian Peaks Wilderness which <br /> is operated by the Forest Service. The outlet works were deteriorated and unreliable and were replaced as a <br /> part of this project. The existing outlet pipe was sleeved with new pipe and a new gate valve was installed. In <br /> addition a new access gate to the outlet works was constructed. All construction materials had to be flown in <br /> via helicopter or carried in by the construction crew. The second reservoir, Allen Lake, is located north of <br /> Boulder and west of Highway 36. The dam was constructed at a 2:1 slope, and is even greater in various <br /> locations due to years of wave action displacing rip-rap and eroding the dam face. This project flattened out <br /> the slope and re-armored it with rock rip-rap. A new outlet pipe was also installed. <br /> PROJECT DATA <br /> Sponsor: Left Hand Ditch County: Boulder Water Source: Left Hand and <br /> Company St. Vrain Creek <br /> Type of Loan: Dam Rehabilitation Board Approval Date: July 2012 <br /> Loan Terms: 2.45% for 30 years (Original) $1,475,307.00 (Final) $1,332,562.39 <br /> Design Engineer: Smith Geotechnical <br /> Contractor: Left Hand Excavating <br /> Project Elements: Lake Isabelle: Sleeved existing outlet pipe with 80-feet of new pipe. Installed 20- <br /> inch double disk valve. <br /> Allen Lake: 125 LF of 20-inch cast-in-place concrete outlet pipe, 5,600 CY embankment fill material, <br /> 4,750 tons of rip rap placed. <br /> Water Project Loan Program - Project Summary <br />