US Army Corps of Engineers

Lower Monumental Dam & Lake

April 2026

Day of MonthTotal Generation MWhAverage Generation MWStation Use MWhInflow kcfsTotal Outflow kcfsGeneration Flow kcfsSpill kcfsMidnight Reservoir ElevationAverage Forebay ElevationAverage Tailwater ElevationAverage Head feet
1 11467 478 17 73.10 73.80 64.90 8.10 537.96 538.60 439.54 99.06
2 10615 442 17 68.20 68.70 60.40 7.50 537.78 537.91 439.31 98.60
3 2200 92 16 70.00 69.10 12.60 55.90 538.03 537.70 438.82 98.88
4 2165 90 16 67.10 68.00 12.30 55.10 537.74 538.02 438.85 99.17
5 2123 88 16 62.70 63.40 12.20 50.50 537.56 537.61 438.78 98.83
6 64.40 63.50 12.20 50.60 537.82 537.68 438.76 98.92
7 61.90 59.70 12.20 46.80 538.47 538.09 438.68 99.41
8 58.20 58.50 12.30 45.40 538.39 538.51 438.45 100.06
9 60.30 60.50 12.20 47.60 538.33 538.47 438.65 99.82
10 61.20 61.10 12.20 48.30 538.38 538.29 438.72 99.57
11 59.70 59.50 12.30 46.50 538.41 538.32 438.71 99.61
12 66.70 67.00 12.40 54.00 538.35 538.37 438.83 99.54
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TOT 28570  82        
AVG 5714 238 16 64.46 64.40 20.68 43.02 538.10 538.13 438.84 99.29
MAX 11467   73.10 73.80 64.90 55.90 538.47 538.60 439.54 100.06
MIN 2123   58.20 58.50 12.20 7.50 537.56 537.61 438.45 98.60