Snow Glacier Dammed Lake Dump History

 

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
2007 10/28  11/09   NA    96,000  10,300  11,700  11/09   8,790  11/10

* 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

In 2007, an overflight on Nov 5 confirmed the release of the lake. However
an estimate of the release level of the lake and corresponding lake volume
could not be made due to recent snowfall.