US Army Corps of Engineers

Lower Granite Dam & Lake

August 2021

Day of MonthTotal Generation MWhAverage Generation MWStation Use MWhInflow kcfsTotal Outflow kcfsGeneration Flow kcfsSpill kcfsMidnight Reservoir ElevationAverage Forebay ElevationAverage Tailwater ElevationAverage Head feetMidnight Lewiston Gage ft
1 2098 87 40 26.40 27.20 12.10 14.70 737.04 737.28 634.58 102.70 737.25
2 2170 90 41 25.40 25.00 12.50 12.00 737.13 737.23 634.71 102.52 737.35
3 2091 87 41 27.20 27.90 12.10 15.20 736.96 737.25 634.66 102.59 737.19
4 2084 87 41 27.60 28.00 12.10 15.40 736.86 736.87 634.42 102.45 737.05
5 2067 86 39 29.00 28.80 11.90 16.30 736.90 737.00 634.24 102.76 737.11
6 2086 87 40 26.40 26.30 12.10 13.70 736.90 736.91 634.63 102.28 737.23
7 2085 87 40 25.20 24.70 12.10 12.20 737.02 737.01 634.54 102.47 737.36
8 2087 87 40 26.50 26.80 12.10 14.10 736.94 737.05 634.68 102.37 737.10
9 921 38 40 23.70 24.30 8.00 15.80 736.79 736.76 634.64 102.12 736.95
10 950 40 41 22.30 24.20 8.10 15.50 736.32 736.50 634.47 102.03 736.50
11 962 40 41 20.50 19.70 8.20 11.00 736.52 736.42 633.99 102.43 736.66
12 1007 42 40 22.40 22.60 8.40 13.70 736.47 736.52 634.26 102.26 736.68
13 2084 87 40 24.40 25.30 12.10 12.70 736.25 736.40 634.02 102.38 736.41
14 2095 87 40 22.40 22.80 12.10 10.20 736.15 736.33 633.59 102.74 736.24
15 2089 87 40 20.50 19.50 12.10 6.90 736.38 736.26 633.67 102.59 736.53
16 2081 87 41 19.40 19.60 12.10 6.90 736.34 736.35 634.05 102.30 736.60
17 1557 65 41 21.40 19.80 10.30 9.00 736.74 736.56 634.48 102.08 736.95
18 2075 86 40 19.30 19.60 12.10 7.00 736.67 736.72 634.88 101.84 736.82
19 2066 86 40 19.90 19.50 12.10 6.90 736.78 736.64 634.97 101.67 736.99
20 2124 89 41 20.80 19.90 12.30 7.00 736.98 737.02 634.54 102.48 737.19
21 2088 87 40 18.70 19.50 12.10 7.00 736.80 736.92 634.71 102.21 736.98
22 2065 86 40 19.10 19.60 12.10 7.00 736.66 736.76 635.32 101.44 737.05
23 2055 86 41 20.70 19.50 12.10 7.00 736.96 736.88 635.81 101.07 737.17
24 2198 92 42 19.60 20.40 12.90 7.00 736.75 736.95 636.24 100.71 736.91
25 2143 89 41 19.70 20.00 12.60 7.00 736.66 736.71 636.30 100.41 736.84
26 2117 88 41 19.20 19.90 12.50 7.00 736.47 736.60 636.63 99.97 736.70
27 2062 86 41 19.10 19.60 12.20 6.90 736.34 736.44 636.55 99.89 736.52
28 2082 87 40 21.50 18.40 12.40 5.50 737.10 736.70 636.96 99.74 737.26
29 2055 86 41 19.00 19.50 12.10 7.00 736.99 737.19 635.95 101.24 737.16
30 2056 86 41 18.00 19.60 12.10 7.00 736.59 736.80 635.78 101.02 737.03
31 2085 87 40 19.50 19.50 12.20 6.90 736.57 736.59 635.47 101.12 736.73
TOT 59785  1255         
AVG 1929 80 40 22.09 22.16 11.62 10.05 736.71 736.76 634.96 101.80 736.92
MAX 2198   29.00 28.80 12.90 16.30 737.13 737.28 636.96 102.76 737.36
MIN 921   18.00 18.40 8.00 5.50 736.15 736.26 633.59 99.74 736.24