US Army Corps of Engineers

Lower Granite Dam & Lake

April 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 8205 342 33 48.20 48.10 47.70 0.00 736.17 736.64 635.18 101.46 736.38
2 8061 336 33 49.30 47.40 46.90 0.00 736.64 736.42 634.78 101.64 736.87
3 3417 142 33 52.10 55.10 19.70 35.00 735.88 736.13 633.38 102.75 736.19
4 3423 143 33 53.20 54.30 19.90 33.90 735.61 735.76 633.40 102.36 735.95
5 3725 155 34 58.50 57.70 21.50 35.70 735.82 735.72 633.45 102.27 736.21
6 3554 148 35 60.90 60.10 20.60 39.00 736.00 735.84 633.67 102.17 736.34
7 3596 150 32 58.50 60.00 20.80 38.70 735.63 735.92 634.30 101.62 736.17
8 3515 146 45 58.70 58.60 20.50 37.60 735.66 735.60 634.43 101.17 736.04
9 56.80 56.40 19.90 36.10 735.76 735.67 634.21 101.46 736.14
10 53.80 51.20 16.80 34.00 736.40 735.89 634.37 101.52 736.76
11 51.60 52.80 18.40 34.00 736.10 736.31 634.31 102.00 736.45
12 49.80 48.60 15.70 32.40 736.38 736.26 634.08 102.18 736.67
13 47.10 47.60 17.10 30.10 736.26 736.38 633.88 102.50 736.56
14 46.40 44.80 16.40 27.90 736.65 736.47 634.14 102.33 736.99
15 45.70 45.50 16.50 28.40 736.70 736.63 634.35 102.28 736.99
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TOT 37497  278         
AVG 4687 195 35 52.71 52.55 22.56 29.52 736.11 736.11 634.13 101.98 736.45
MAX 8205   60.90 60.10 47.70 39.00 736.70 736.64 635.18 102.75 736.99
MIN 3417   45.70 44.80 15.70 0.00 735.61 735.60 633.38 101.17 735.95