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To aid in the interstate matters between Colorado and Wyoming in the Wyoming v. <br />Colorado [353 U.S. 953 (1957)] Supreme Court Case, an agreement was established <br />between Water Supply and Storage Company and Windsor Reservoir and Canal <br />Company concerning the diversions of Skyline Ditch and Laramie Poudre Tunnel. By <br />agreement, diversions of the Skyline Ditch and Laramie Poudre Tunnel are combined. <br />The combined diversions are allotted at 58 percent to the Skyline Ditch and 42 percent to <br />the tunnel. Therefore, by virtue of their sole ownership of Skyline Ditch and two-thirds <br />ownership in the Laramie Poudre Tunnel, Water Supply and Storage receives 86 percent <br />of the combined diversions. Conversely, Windsor Reservoir and Canal Company own 14 <br />percent of the combined diversions of Skyline Ditch and Laramie Poudre Tunnel. <br />OPERATIONAL INFORMATION <br />Diversions through the Laramie Poudre Tunnel start in mid-may, peak in June or early July, and <br />may run into September. Laramie Poudre Tunnel frequently receives water exchanged from <br />Skyline Ditch. Operation with respect to water exchanged from Skyline Ditch is the same as that <br />for all Laramie Poudre Tunnel water. <br />The operating strategy for water transported through the Laramie Poudre Tunnel varies <br />depending on numerous variables including the demand for water by stockholders, the amount of <br />water in the basin, and the weather. When stockholders are irrigating, water may be released to <br />meet the irrigating needs of the stockholders or to satisfy minimum streamflow requirements. <br />When water is not being released downstream, it is stored at the highest elevation reservoir <br />possible. Diversions through Laramie Poudre Tunnel may be turned off completely if there is <br />excessive rain or water in the basin and the act of importing additional water could increase the <br />possibility of flood conditions. <br />Where to find more information <br />^ Specifics relating to the data collection and filling processes used in the determination of <br />the best source of data are presented in the SPDSS Task 4 Memorandum -Identify and <br />Fill/Resolve Conflicting Records for Key Transmountain Diversion Structures. <br />^ Additional information on ditch and reservoir operations within Water District 3 is <br />presented in the Water District 3 Meeting Notes prepared for SPDSS Task 3 -Identify <br />Key Diversion Structures. <br />^ Additional information regarding the operating practices for Water Supply and Storage <br />Company and Windsor Reservoir and Canal Company are presented in the Water Supply <br />and Storage and Larimer Weld Irrigation Company Memorandums, respectively, <br />prepared for the SPDSS Task 5 -Key Structures. <br />COMMENTS AND CONCERNS <br />None. <br />LaramiePoudreTunnel.doc 8 of 10 <br />