US Army Corps of Engineers

Lower Granite Dam & Lake

October 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 2640 110 51 17.50 17.00 15.20 1.40 735.59 735.61 636.53 99.08 735.77
2 2396 100 52 17.70 15.80 13.70 1.40 736.09 735.86 636.40 99.46 736.28
3 2357 98 52 17.60 15.50 13.40 1.50 736.62 736.38 636.50 99.88 736.83
4 2638 110 52 17.20 17.10 15.00 1.60 736.65 736.79 636.56 100.23 737.00
5 2772 116 52 17.90 17.90 15.80 1.60 736.64 736.72 636.50 100.22 736.89
6 3084 128 51 18.80 19.70 17.50 1.60 736.43 736.46 636.49 99.97 736.51
7 3532 147 53 22.40 22.30 20.00 1.50 736.46 736.48 636.25 100.23 736.43
8 3349 140 49 22.90 21.20 19.00 1.60 736.85 736.78 636.40 100.38 737.01
9 3461 144 47 22.50 22.00 19.60 1.80 736.98 737.10 636.63 100.47 737.12
10 3337 139 47 21.00 21.20 19.00 1.80 736.92 737.05 636.66 100.39 737.17
11 3248 135 46 21.30 20.60 18.40 1.70 737.08 737.20 636.61 100.59 737.26
12 3385 141 46 18.50 21.60 19.30 1.70 736.31 736.71 636.49 100.22 736.37
13 2933 122 46 19.20 18.80 16.80 1.50 736.42 736.12 636.60 99.52 736.58
14 2730 114 46 16.60 17.70 15.60 1.60 736.15 736.08 636.69 99.39 736.30
15 2224 93 46 16.10 14.70 12.70 1.50 736.51 736.28 636.45 99.83 736.66
16 2377 99 46 16.00 15.60 13.50 1.60 736.62 736.48 636.49 99.99 736.79
17 2324 97 46 16.00 15.40 13.20 1.60 736.78 736.58 636.61 99.97 736.96
18 2526 105 46 15.80 16.50 14.40 1.60 736.61 736.70 636.58 100.12 736.86
19 2516 105 46 16.20 16.50 14.40 1.60 736.53 736.55 636.78 99.77 736.73
20 2453 102 46 16.40 16.10 14.00 1.60 736.60 736.57 636.80 99.77 736.68
21 2420 101 44 17.10 15.90 13.80 1.60 736.81 736.62 636.67 99.95 736.84
22 2563 107 44 16.90 16.90 14.50 1.70 736.80 736.77 636.44 100.33 737.00
23 2575 107 46 16.90 16.70 14.60 1.70 736.83 736.82 636.38 100.44 736.92
24 2584 108 46 15.50 16.90 14.70 1.70 736.47 736.70 636.35 100.35 736.98
25 2224 93 46 16.80 14.70 12.60 1.60 736.99 736.75 636.50 100.25 737.11
26 2623 109 46 16.40 17.10 14.90 1.70 736.81 736.99 636.63 100.36 737.03
27 2807 117 46 18.10 18.10 15.90 1.70 736.83 736.91 636.70 100.21 736.79
28 18.30 18.70 16.70 1.70 736.70 736.66 636.43 100.23 736.68
29 17.80 17.10 15.00 1.60 736.87 736.54 636.55 99.99 736.92
30 16.70 16.70 14.70 1.60 736.86 736.79 636.63 100.16 737.11
31 17.10 16.70 14.50 1.60 736.97 736.87 636.49 100.38 737.13
TOT 74081  1283         
AVG 2744 114 48 17.91 17.70 15.56 1.61 736.64 736.61 636.54 100.07 736.80
MAX 3532   22.90 22.30 20.00 1.80 737.08 737.20 636.80 100.59 737.26
MIN 2224   15.50 14.70 12.60 1.40 735.59 735.61 636.25 99.08 735.77
BUILDING STRONG®