US Army Corps of Engineers

Lower Granite Dam & Lake

August 2025

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 3271 136 52 26.30 25.40 18.60 6.30 733.57 733.75 633.16 100.59 734.11
2 3702 154 52 27.10 27.80 21.00 6.40 733.38 733.78 633.27 100.51 734.07
3 3439 143 52 25.70 26.00 19.50 6.10 733.29 733.50 633.14 100.36 733.79
4 3442 143 52 27.40 26.40 19.60 6.20 733.56 733.64 633.37 100.27 734.04
5 3233 135 52 24.50 25.20 18.50 6.20 733.39 733.58 633.78 99.80 733.91
6 3336 139 51 25.90 25.60 19.00 6.10 733.47 733.47 633.77 99.70 733.86
7 3263 136 51 25.20 25.30 18.60 6.20 733.47 733.61 633.63 99.98 734.02
8 3302 138 51 25.50 25.60 18.90 6.10 733.45 633.75 733.90
9 3427 143 51 25.40 26.20 19.50 6.10 733.27 633.62 733.81
10 3242 135 51 25.10 25.00 18.60 6.00 733.29 733.36 633.74 99.62 733.70
11 800 33 52 26.20 26.60 8.80 17.20 733.19 733.37 634.05 99.32 733.70
12 52 2 52 27.90 25.80 5.80 19.60 733.71 733.58 633.63 99.95 733.98
13 1743 73 52 27.10 28.70 13.50 14.50 733.30 733.77 634.04 99.73 734.18
14 2916 121 52 24.00 23.30 16.70 6.10 733.50 733.52 634.09 99.43 733.71
15 3053 127 52 23.90 24.30 17.40 6.30 733.39 733.70 633.76 99.94 733.77
16 3162 132 52 23.50 24.60 18.10 6.00 733.14 733.41 633.50 99.91 733.45
17 2589 108 52 22.00 21.20 14.70 5.90 733.33 733.32 633.06 100.26 733.42
18 2700 113 52 22.10 21.80 15.30 6.00 733.39 733.39 632.92 100.47 733.50
19 2876 120 52 23.50 23.00 16.40 6.10 733.54 733.51 633.24 100.27 733.66
20 2856 119 52 23.20 22.90 16.30 6.20 733.63 733.56 633.65 99.91 733.71
21 2839 118 52 23.20 23.00 16.30 6.30 733.68 733.71 633.92 99.79 733.82
22 2990 125 52 23.60 24.00 17.20 6.20 733.59 733.62 634.42 99.20 733.67
23 2942 123 52 23.60 24.00 16.90 6.50 733.50 733.89 634.68 99.21 733.89
24 2371 99 52 22.20 20.40 13.60 6.40 733.94 733.82 634.48 99.34 733.96
25 2462 103 52 21.20 21.20 14.10 6.60 733.94 733.99 634.49 99.50 734.02
26 2867 119 52 22.30 23.50 16.40 6.60 733.65 734.02 634.67 99.35 734.03
27 23.80 22.80 15.70 6.60 733.91 733.98 635.06 98.92 734.08
28 23.00 24.50 17.60 6.60 733.53 733.98 635.54 98.44 733.93
29 23.30 21.70 14.90 6.40 733.92 733.85 635.51 98.34 733.94
30 24.40 24.40 17.00 6.70 733.92 734.11 635.71 98.40 734.11
31 23.90 23.30 16.10 6.70 734.07 734.15 635.93 98.22 734.19
TOT 72876  1347         
AVG 2803 117 52 24.39 24.31 16.47 7.33 733.55 733.69 634.05 99.61 733.87
MAX 3702   27.90 28.70 21.00 19.60 734.07 734.15 635.93 100.59 734.19
MIN 52   21.20 20.40 5.80 5.90 733.14 733.32 632.92 98.22 733.42
BUILDING STRONG®