US Army Corps of Engineers

Lower Granite Dam & Lake

September 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 3468 145 40 21.20 21.10 20.40 0.00 736.60 736.96 636.51 100.45 736.72
2 3189 133 39 21.20 19.60 18.90 0.00 737.01 736.99 636.91 100.08 737.12
3 3417 142 38 21.10 20.90 20.30 0.00 737.06 737.24 636.93 100.31 737.18
4 3630 151 40 21.30 21.90 21.50 0.00 736.92 737.19 637.05 100.14 737.08
5 3509 146 40 20.50 21.50 20.90 0.00 736.67 736.96 636.95 100.01 736.75
6 3436 143 40 20.00 20.60 20.10 0.00 736.52 736.89 636.34 100.55 736.60
7 3331 139 39 19.70 19.90 19.40 0.00 736.48 736.83 635.13 101.70 736.58
8 3479 145 38 20.30 20.90 20.40 0.00 736.52 736.81 634.75 102.06 736.66
9 3368 140 39 20.70 20.00 19.40 0.00 736.68 736.88 635.16 101.72 736.84
10 3346 139 41 21.80 20.20 19.60 0.00 737.08 736.99 635.70 101.29 737.20
11 3295 137 41 19.10 19.70 19.20 0.00 736.93 737.26 636.36 100.90 737.11
12 3065 128 40 19.50 18.60 18.10 0.00 737.16 737.13 636.60 100.53 737.25
13 3654 152 42 20.20 22.10 21.50 0.00 736.69 737.15 636.93 100.22 736.95
14 3145 131 39 19.30 19.20 18.70 0.00 736.71 736.81 636.83 99.98 736.84
15 3142 131 38 18.90 19.10 18.60 0.00 736.66 736.93 636.96 99.97 736.91
16 19.50 19.30 18.80 0.00 736.71 736.89 636.76 100.13 736.85
17 19.30 19.70 19.10 0.00 736.60 736.90 636.74 100.16 736.68
18 18.60 17.90 17.40 0.00 736.77 736.92 636.86 100.06 736.97
19 18.20 17.70 17.10 0.00 736.90 737.07 636.88 100.19 737.05
20 19.00 19.10 18.60 0.00 736.89 737.06 636.87 100.19 737.01
21 19.80 21.30 20.80 0.00 736.54 736.83 636.81 100.02 736.71
22 19.70 19.00 18.50 0.00 736.69 736.86 636.80 100.06 736.89
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TOT 50473  595         
AVG 3365 140 40 19.95 19.97 19.42 0.00 736.76 736.98 636.49 100.49 736.91
MAX 3654   21.80 22.10 21.50 0.00 737.16 737.26 637.05 102.06 737.25
MIN 3065   18.20 17.70 17.10 0.00 736.48 736.81 634.75 99.97 736.58
BUILDING STRONG®