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. . . ~"'An ,.:, ".3.1 _c ..' j ,'" . '- , ~... s ....P.., ....!l\: ',' << 'i'-- c "~--~~ .\~, :'F"'.~J. .",;~i DILLON RESERVOIR GAGED INFLOW DATA OBSERVATIONS , "';',\j. October, 1956 - April, 1957 .~, -; ,.t' ~,;::i\{i:,~t~o ~ ~~ Pre Dillon Reservoir 17% of base flow from 48% of base flow from 35% of base flow from Significant diversion and Dillon gages Base flow during this period is 46 cfs or greater at Dillon Dam March is the driest month Snake River Blue River Tenmile Creek on Snake River between Montezuma October, 1971 - April, 1972 11 days in November, 1971 violate Denver Water Board-BLM agreement Dillon releases generally exceed inflow 27% of base flow from Snake River 47% of base flow from Blue River 27% of base flow from Tenmile Creek October, 1976 - April, 1977 9 days in December violate agreement and 4 days in April Estimated inflow 50 cfs or less during last part of December, all of January, February, March and first 8 days of April October, 1977 - June, 1978 Inflow 50 cfs or less from November 9 through March 30 Lowest inflow is 34.2 cfs Violations of agreement occur January 9 through 16, and April 15 through June 20 25% inflow from Snake River 49% inflow from Blue River 26% inflow from Tenmile Creek October, 1980 - , 1981 violations of agreement October 20 through 30, and March 17 through 20 Inflow 50 cfs or less, January 26 through March 5 Notes Inflows from ungaged inflow after Dillon Reservoir are estimated at 5-10 cfs during the baseflow period depending on precipitation and other considerations. This represents around 15 percent. 802 RS/DR j ,. ~.i, _;;;,,-,~-~ ';;; i-__~::l ~/11.-'~itr)i