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conservation pool of approximately 100 ac-ft is maintained in the reservoir for fish habitat <br />purposes as a requirement of the ditch company's special use permit with the U.S. Forest <br />Service. <br />An elevation-capacity curve for the reservoir was provided by the Left Hand Ditch Company. A <br />subset of points from the curve is provided in Table 3. <br />Table 3 <br />Left Hand Park Reservoir <br />Stage -Area -Capacity Curve <br />Elev. Area Capacity <br />(ft) (Acres) (Ac-Ft) <br />0 NA 0 <br />2 NA 2.97 <br />4 NA 4.39 <br />6 NA 19.05 <br />8 NA 33.09 <br />10 NA 59.72 <br />12 NA 112.28 <br />14 NA 189.56 <br />16 NA 289.33 <br />Elev. Area Capacity <br />(ft) (Acres) (Ac-Ft) <br />18 NA 383.22 <br />20 NA 493.59 <br />22 NA 613.83 <br />24 NA 745.78 <br />26 NA 890.76 <br />28 NA 1050.05 <br />30 NA 1227.90 <br />32 NA 1403.04 <br />33 98 1499.38 <br />NA -not available <br />Source: Left Hand Ditch Compairy <br />Capacity: <br />Total Storage: 1,499 ac-ft 98 maximum surface acres <br />Active Storage: 1,499 ac-ft <br />Dead Storage: 0 ac-ft <br />Maximum outlet release of 30 cfs through a 3-foot concrete pipe <br />Enlargement History: Left Hand Park Reservoir was enlarged (approximately 1,100 ac-ft) <br />when it was rebuilt in the 1960s. <br />Reservoir Storage Measurement: Storage levels in Left Hand Park Reservoir are measured at <br />the end of the summer and at the end of the storage season. <br />Seepage: Seepage from Left Hand Park Reservoir is considered minimal. <br />Lake Isabelle (Structure ID 0504012) <br />Lake Isabelle is an on-channel reservoir located at about 11,000 feet elevation on the South Fork <br />St. Vrain Creek, above the ditch company's diversion headgate on South Fork St. Vrain Creek. <br />Access to water in the reservoir is provided by a tunnel that was drilled into the downstream face <br />Left Hand Ditch Operating Memorandum.doc 9 of 17 January 5, 2005 <br />