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• Maximum surface area of 584 acres <br />• 7,035 ac-ft minimum pool including 6,692 ac-ft of dead storage <br />• 13,068 ac-ft active storage capacity used by Denver Water <br />• Outlet capacity to Marston Water Treatment Plant is not limiting <br />• Outlet capacity to Bear Creek is not limiting <br />• Seepage losses from Marston Reservoir occur to Bear Creek and Bowles Lake. As an off- <br />channel reservoir, the seepage losses can be recovered, which occurs via an underground <br />collection system that pumps the water back into the reservoir. <br />An elevation-area-capacity table for Marston Reservoir was provided by Denver Water, as <br />summarized in Table 7. <br />Table 7 <br />Elevation-Area-Capacity Data <br />Marston Reservoir <br />Description Elevation Area Capacity <br />(feet msl) (acres) (ac-ft) <br />River bed level 5,468 0 0 <br /> 5,488 120 1,198 <br /> 5,500 211 3,141 <br /> 5,512 323 6,350 <br />Dead storage level 5,513 342 6,692 <br />Minimum pool 5,514 361 7,035 <br /> 5,516 401 7,797 <br /> 5,518 433 8,631 <br /> 5,520 464 9,528 <br /> 5,522 490 10,481 <br /> 5,524 516 11,488 <br /> 5,526 550 12,553 <br />Normal High Water Line (spillway) 5,528 584 13,687 <br />Maximum Water Surface Line 5,530 611 14,882 <br /> 5,532 621 16,114 <br /> 5,534 630 17,365 <br /> 5,536 637 18,631 <br /> 5,538 642 19,910 <br />Dam Crest 5,538.3 643 20,103 <br />Source: Denver Water <br />HydroBase Data <br />The data for the 1950 to present period of record pertaining to Marston Reservoir include the <br />following: <br />End-of--Month Contents (see Figure 14) <br />• End-of--month contents missing for water years 1950 to 1955, 1958 to 1962, 1989 to <br />present along with sporadic months missing in other years. Denver Water provided a <br />complete set of end-of--month storage contents data for the August 1956 to present period <br />(data for prior years are unavailable). These data have been forwarded to the DWR <br />database administrator for inclusion into HydroBase, and are included in Figure 14. <br />• HydroBase data are available for a portion of the missing Denver Water data -December <br />1955 to July 1956. The combined data set is summarized in Figure 14. <br />Denver Water Board Operating Memorandum 24 of 40 <br />