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UPPER BASIN RESERVOIRS FONTENELLE RESERVOIR (GREEN RIVER) Water Year 1987 The water year 1987 plan of operation for Fontenelle Reservoir was to maintain the water surface elevatioD as near as possible to 6,443 feet. This elevation restriction was imposed due to ongoing modification work to correct excessive seepage from the reservoir. The January 1, 1987 forecast of Aprilthrougb July runoff was 116 percent of average and gradually declined to 81 percent of average on April 1, 1987, Tbe forecast continued to decline through the spring runoff, until on June 1, it was 74 percent of average, This low forecast was a result of a persistent high pressure zone over much of the western states callsing low precipitation, With the combination oflow runoff and releases matching inflows, the reservoir elevation at FonteJ1elle was maintained near 6,443 feet throughout water year 1987. On ACTUAL RELEASES WY 1987 1OQOc:FI . 7 . . . . 7 NDJFMAMJJASO April 3, releases were increased as the spring runoff began, maximum releases of 6,900 cfs occurred on May 21-22 as tbe innow into the reservoir peaked on May 22, Fontenelle Reservoir reached a peak elevation of 6445,2 feet on April 6, 1987, The actual April througb July runoff into Fontenelle Reservoir was 736,000 acre-feet wbich was 88 percent of average, Inflow for the entire water year 1987 was 1,154,000 acre-feet or 96 percent of average. The total release from Fontenelle Dam for water year 1987 was 1,148,000 acre-feel. Since the reservoir level was below the minimum power elevation for most of tbe year the powerplant at Fontenelle was not used during water year 1987. FONTE NELLE RESERVOIR Reservoir Acre-feet Elevation, feet Maximum Storage Rated Head Minimum Power Surface Area, full Reservoir Lengtb, full 344,834 233,789 194,%2 6,506 6,491 6,485 8,058 Acres 18 Miles Powerplant Number of Units Total Capacity 1 10,000 KW 5