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Additional use of storage water occurs later in the season depending on climate, river stage and <br />storage availability. Water users typically utilize a large portion of the storage available in <br />Terrace Reservoir each year. Additional information about reservoir operations can be <br />found in the memorandum documenting the Terrace Irrigation Company interview. <br />La Jara Reservoir is are owned by the DOW. Prior to its purchase by DOW in the early 1960's, <br />the reservoir was owned by the Union Ditch. DOW currently operates the reservoir primarily to <br />replace evaporative and seepage losses, and typically stores 5,000 to 6,000 acre-feet each year. <br />District Commissioners pass all inflows when irrigation water rights are in priority and storage <br />rights are called out. Adjustments to the reservoir gates are made at a minimum once per week in <br />order to pass inflows. <br />Trans-Mountain Diversions <br />There are no trans-mountain delivery or release points within District 21 <br />Day to Day Water Rights Administration <br />Water rights administration occurs by way of frequent and detailed communication between the <br />two District 21 Commissioners, the Division 3 Engineer (Steve Vandiver) and his staff, and the <br />many ditch owners in the District. Commissioners work closely with ditch owners to inform <br />them of flow conditions, calling water right priorities, and their own individual entitlements. The <br />Commissioners actively work to control and adjust several of the ditch headgates, and request <br />adjustments by owners of other structures. The required frequency to adjust headgate structures <br />(diversion flow rate) is a function of the variability of instream flow conditions and the needs of <br />the water users. A sample "call sheet" for District 21 is provided as Attachment 3. <br />While the majority of diversion records reflect actual observations by the Commissioners, <br />diversions through other structures may be reported by the ditch owners ("user supplied" <br />information). Records that are supplied by ditch owners typically occur on the smaller, junior <br />water rights that are less significant from an administrative perspective. <br />Interaction with Division 3 <br />While the District Commissioners are responsible for on-the-ground administration of water <br />rights, their efforts are directed and overseen by the Water Division 3 office. Daily diversion and <br />storage records are compiled by the Commissioners, then provided directly to the Division 3 <br />office for review and incorporation into the State's diversion record database. <br />Interstate Compact Administration <br />Use of water rights within District 21 not effected by requirements set forth under of the Rio <br />Grande Compact. However, see the memorandum documenting the Division 3 interview <br />which indicates that the treatment of flood flows and groundwater in the Alamosa and La <br />Jara systems contributing to the Rio Grande are administered differently per the 1980 <br />Supreme Court case. <br />Swing ("calling") Rights <br />The daily administration of water rights in District 21 is routinely effected by several calling <br />priorities. These calling priorities (or "swing rights") differ depending on the flow levels of the <br />C:Acdss\D21_Mem.doc District 21 InterviewJuly 2, 1999 -Page 6 of 8 <br />