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Table 1 <br />Marshall Lake Elevation -Capacity <br />Elevation <br />(ft) Gage Height <br />(ft) Cumulative Capacity <br />(ac-ft) <br />5645.4 6 0 <br />5655.4 16 773 <br />5665.4 26 1,857 <br />5675.4 36 3,306 <br />5685.4 46 5,167 <br />5695.4 56 7,466 <br />5704.4 65 9952 <br />Reservoir Storage Measurement: Storage levels in Marshall Lake are measured using a staff <br />gage. <br />Reservoir Seepage Information: No information regarding reservoir seepage was found. <br />HydroBase Data: Historical end-of--month storage records are available for Marshall Lake in <br />HydroBase under Structure ID 0604212 for most of the 1950 through 2003 SPDSS study <br />period. Diversion records for Marshall Lake are available in HydroBase under the same <br />Structure ID for 1976 through 1985. <br />The annual pattern exhibited in the end-of--month reservoir storage, as shown in Figure 2, <br />reflects the typical operating schedule discussed in the subsequent Operational <br />Information section of this memo. Reservoir storage typically reaches a maximum each <br />year between April and July. Reservoir levels drop throughout the irrigation season <br />reaching the lowest level late in the irrigation season, typically between September and <br />November. Through the winter storage period of November through May, a minimal <br />amount of water is collected in the reservoir, which slowly increases the end-of--month <br />storage level. Except during significant drought years such as 2002, Marshall Lake is <br />typically filled to capacity. Water is typically released for irrigation beginning in May <br />and continuing through October with peaks occurring in July and August. Direct <br />deliveries diverted from the Upper Community Ditch through Marshall Lake to the <br />Lower Community Ditch typically occur in May through July, peaking in June during the <br />height of the snowmelt runoff season. <br />FRICO_Marshall.doc 6 of 12 <br />