Release History: Drains every 2 to 3 years during Nov, Dec, or Jan beginning 1911 or earlier thru 1953; after 1953, Sep, Oct, and Nov have been typical months of release. Glacier Dammed Lake Snow River Cooper Landing (flood=13400cfs) Yr. Release Dates Est. Est. Est. Peak Date Peak Date Begin End Pool Volume Peak Flow Flow Elev Outflow (Ft) (Ac-Ft) (CFS) (CFS) (CFS) 1949 10/18 10/29 2677 116,300 14,900 16,400 10/27 11,600 10/28 1951 11/05 11/20 2582 77,900 11,000 11,500 11/17 6,250* 11/18 1953 12/04 12/19 2587 80,000 7,000 7,300 12/15 4,420* 12/17 1956 10/18 11/01 2651 105,200 12,500 12,900 10/29 7,310* 10/30 1958 10/06 10/20 2649 104,400 13,900 14,200 10/17 8,350* 10/17 1961 09/28 10/08 2732 141,900 19,200 20,000 10/07 14,000 10/08 1964 09/15 09/27 2697 125,500 15,900 17,900 09/23 14,200 09/24 1967 08/26 09/02 2689 121,900 26,800 28,600 08/31 21,500 09/01 1970 09/08 09/24 2754 152,900 17,000 17,800 09/22 12,100* 09/23 1974 09/09 09/22 2833 194,800 25,000 26,400 09/20 23,100 09/21 1977 08/29 09/08 2760 122,400 13,900 16,700 09/05 14,900* 09/06 1979 10/18 10/24 2645 102,900 14,800 15,700 10/24 12,800 10/24 1982 09/17 10/01 2736 143,900 13,700 16,100 09/29 15,500 09/29 1985 11/21 12/05 2730 129,000 11,800 12,000 12/02 8,230 12/03 1988 10/19 11/03 2725 138,600 11,500 11,800 10/29 8,820 10/30 1990 10/28 11/09 2720 136,200 14,800 15,700 11/07 9,100 11/08 1993 09/11 09/21 2715 133,900 17,500 29,600 09/19 17,200 09/19 1996 07/27 08/08 2684 119,800 14,700 15,500 08/05 14,700 08/06 1998 09/30 10/14 2675 115,700 12,600 13,400 10/10 9,940 10/11 2001 09/06 09/22 2705 130,000 *** *** 09/22 15,780 09/23 2003 11/07 11/22 2665 99,000 12,200 13,300 11/16 10,600 11/17 2005 10/23 11/05 2660 98-107K *** *** 10/30 10,000 10/31 * indicates daily mean flow (cfs) *** extensive scour at the Snow River gauge; unable to accurately estimate peak outflow from the glacier dammed lake or peak flow on the Snow River