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<br />Logan Irrigation District
<br />May 16.17, 2006
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<br />Agenda Item 11 a
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<br />The Prewitt Operating Committee operates the Prewitt Reservoir and its associated structures for the .
<br />benefit of the landowners and shareholders by providing stored water as a supplement to their direct .
<br />flow irrigation water. The reservoir provides supplemental irrigation water for approximately 28,000
<br />acres, well augmentation, and recreation, The Prewitt Inlet Ditch diverts from the South Platte River.
<br />just upstream of the Logan/Morgan County line, with average annual diversions of 40,160 acre feet.
<br />Average annual delivery to landowners is approximately 18,400 acre feet (LID - 0.75 acre-ftIacre;
<br />liD - 0.45 acre-ftIacre; and MPRC -14 acre feeUshare.) Background information on each owner is
<br />provided below. The water is stored in the reservoir and deliveries are made either to the South Platte
<br />Ditch or directly to the South Platte River for use by various ditches in Logan County or for exchange to
<br />water users in Morgan County or for augmentation of wells within the service area.
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<br />Prewitt Reservoir - Prewitt Reservoir is an off-stream reservoir constructed in 1910-12, located
<br />primarily in Washington County, with a portion of the dam in Logan County, The dam is a Medium
<br />Size (< 50,000 AF), Class 1 Dam (loss of life expected in the event of failure), with a dam height of
<br />36 feet at Gage Height (GH) 35,5. The dam has a length of 3.5 miles. The maximum storage is
<br />32,300 acre feet (GH 28,0), but the reservoir is currently restricted to 28,600 acre feet (GH 26.5),
<br />The lake has a surface area of 2300 acres at the restricted level. The outlet works (4 - 5'x2'
<br />concrete boxes) are located in the NW corner of the reservoir, and the reservoir has no service or
<br />emergency spillway, with the exception of a low depression in the SW corner of the reservoir, which
<br />the State Engineer's Office (SEO) considers a natural open-channel emergency spillway, The
<br />reservoir has a Colorado Division of Wildlife recreation lease that provides income to the reservoir
<br />owners.
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<br />The proposed emergency pipe spillway is being constructed to address SEO dam safety requirements.
<br />The Prewitt Reservoir has operated at a restricted storage of 28,600 acre feet for over 20 years and
<br />will be further restricted without the construction of an emergency spillway, It is the desire of the ,.
<br />Prewitt Operatin9 Committee to once again store the full decreed amount. It is felt that the .
<br />construction of the emergency spillway is the first step in completely removing the storage restriction,
<br />Additional steps may be a dam stability/seepage study and addressing safety concerns with regard to
<br />wave action due to wind,
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<br />Feasibilitv Studies
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<br />The LID, through Jim Yahn, P,E., Manager of the Prewitt Operating Committee, has completed the
<br />feaSibility study in accordance with CWCB guidelines, The study includes an assessment of
<br />alternatives to address the emergency spillway issues. The engineering design work for the project
<br />has been completed by W. W, Wheeler and Associates of Englewood, Colorado.
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<br />Proiect Participants
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<br />LOQan Irrication District (Project Sponsor) -The LID was formed on December 19, 1910 by order of
<br />the Logan County Commissioners and operates as an Irrigation District under the Irrigation District
<br />Law of 1905 (C,RS. 37-41-101 to 160), including amendments in C,RS, 37-43-101 to 211. The
<br />LID office is located in Sterling. LID levies an acreage assessment based on benefits received, but
<br />there is no mill levy assessment. The Logan County Treasurer serves as the ex officio LID
<br />Treasurer and collects and distributes assessments, in the same manner as property taxes are
<br />collected, Money is distributed to the LID on a monthly basis, Elected governing Board Members
<br />are: Robert Lingreen, President, Rod Mari - Vice President, Gerald Ruf - Director, James Yahn -
<br />Secretary/Manager is appointed by the Board, Typically, about 50% of the LID budget comes from
<br />acreage assessments, and 50% from the State recreation lease, In 2005, the total revenues for LID .-
<br />were $73,200, There are 128 landowners and 12,818,9 District acres. The current levy is ,.
<br />$2 , 60/acre. The LID provides water for both irrigation and augmentation: The irrigated acreage
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