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, .. - e e STATE OF COLORADO Colorado Water Conservation Board Department of Natura! Resources 1313 Sherman Street, Room 721 Denver, Colorado 80203 Phone: (303) 866-3441 FAX: (303) 866-4474 www.cwcb.state.co.us MEMORANDUM Bill Owens Governor Russell George Executive Director TO: Colorado Water Conservation Board Members Kirk Russell, P.E. '/..f;?--~~/ I' Mike Serlet, P.E., Chief P'/~J Water Supply Planning an Finance Section Rick Brown Acting Depnty Director Rod Kuharich CWCB Director FROM: DATE: November 8,2005 SUBJECT: Agenda Item 23a, November 15-16, 2005 Board Meeting Water Supply Planning and Finance Section - New Loans Highland Ditch Company - Foothills Reservoir Dam Repair Project Introduction The Highland Ditch Company (Company) is applying for a loan from the Colorado Water Conservation Board in the amount of $540,000 for the Foothills Reservoir Dam Repair Project (Project). The Foothills Reservoir (Reservoir) is located west of Longmont, Colorado, and is currently restricted by the State Engineer's Office to 3,080 ac-ft. This is about 70% of the 4,320 ac-ft capacity of the Reservoir. The Reservoir is owned and operated by the Company for irrigation uses. The Project will include excavating a core trench into the center of the dam to cut off seepage and add stability. The Project is expected to cost $600,000 and is currently under construction utilizing bridge financing. See attached Project Data Sheet for a location map and a project summary. Backaround Foothills Reservoir Dam is a Class I, Intermediate Dam. The Dam was rehabilitated in 2001 with the assistance of a CWCB Loan (Contract #C150015). The 2001 project included the construction of a new spillway, drainage system on the dam face and a toe drain. In 2003, the reservoir was filled above gage height 39 feet for the first time since the 1970's and excessive seepage was noted in the drain system. The reservoir has since been limited to gage height 39 feet. In January 2004, the Company investigated the dam to determine the cause of excess seepage. It was determined that the cause was a layer of poorly compacted shale. The Company decided to repair the dam by installing a clay core trench in the upper portion of the dam to cut off seepage. Additional storage restrictions may be necessary if the dam continues to deteriorate due to internal seepage. The Company leases the reservoir during the summer months to a fishing club, but the club will not be adversely impacted by the construction. The Company retains the right in its lease with the club Flood Protection. Water Supply Planning and Finance. Stream and Lake Protection Water Supply Protection. Conservation and Drought Planning