WSP00286 - Laserfiche WebLink

Home Browse Search

June's precipitation for the San Juan River Basin was fairly wet logging in at 140 percent of averag~. This is the third straight month of above average precipitation. Because of the late season moisture, the dismal winter snowpack accumulation was quickly restored to normal levels, which resulted in near normal runoff volumes. Inflows into Navajo Reservoir reached a peak on May 24. when the daily inflow average was measured at 5.300 cfs. Anyone needing further information about the daily operations of Navajo Reservoir should contact Rege Leach in the Durango Office at (970) Glen Canvon Dam - Releases from Glen Canyon Dam in July, will be averaging about 18,000 cfs, Fluctuations will generally be between a low of about 13.000 cfs to a high of about 20,600 cfs, The July final forecast, issued by the National Weather Service on July 7 is predicting unregulated April through July inflow into Lake Powell to be 7,6 million acre-feet. This is 98 percent of average. Cool weather in April and May this year resulted in a delayed snowmelt-runoff. Unregulated inflow into Lake Powell in April, May and June was 606000 acre-feet (60 percent of average) in April, 1,874.000 acre-feet (84 percent of average) in May, and 3,416,000 acre-feet (115 percent of average) in June. July's unregulated inflow is expected to be about 1,700,000 acre-feet (112 percent of average), The elevation of Lake Powell is now about 3694,5 feet (5.5 feet from full), and the rate of inflow is currently about 25,000 cfs. Unless inflow deviates significantly from the forecast, Lake Powell should reach a peak elevation of about 3695 feet (5 feet from full) in mid July. With respect to the triggering of a BeachlHabitat Building Flow (BHBF), the chances of a BHBF this year is now extremely low. Since Lake Mead contents are expected to be greater than that of Lake Powell, equalization releases as specified in the 1968 Colorado River Basin Project Act are not expected to occur in water year 1999.