US Army Corps of Engineers

Bonneville Dam & Lake on Columbia River

April 2021

Day of MonthTotal Generation MWhAverage Generation MWStation Use MWhInflow kcfsTotal Outflow kcfsGeneration Flow kcfsSpill kcfsMidnight Reservoir ElevationAverage Forebay ElevationAverage Tailwater ElevationAverage Head feetProject Average Tailwater2nd Powerhouse Total MWh2nd Powerhouse Flow kcfs
1 12705 529 96 131.40 127.40 113.80 1.30 74.90 73.90 11.80 62.10 12.00 8627 78.40
2 12761 532 96 121.70 126.70 113.00 1.30 74.30 74.70 11.80 62.90 12.00 8673 78.00
3 12969 540 96 135.40 129.40 115.60 1.50 75.00 74.30 11.80 62.50 12.00 8482 76.80
4 13153 548 96 139.20 130.20 116.30 1.50 75.80 74.70 11.80 62.90 12.00 8329 75.10
5 15252 636 96 150.10 148.10 134.90 0.80 76.00 75.40 12.80 62.60 12.80 8835 79.50
6 15291 637 96 147.10 149.10 135.70 0.90 75.70 75.40 13.10 62.30 13.10 8865 80.00
7 13509 563 96 122.00 134.00 120.10 1.50 74.70 74.80 12.20 62.60 12.20 8274 75.00
8 13841 577 96 137.70 138.70 124.80 1.50 74.60 74.00 12.50 61.50 12.50 8332 76.50
9 138.00 135.00 121.10 1.50 74.60 74.90 12.20 62.70 12.30 76.20
10 145.20 140.20 33.10 94.70 75.40 74.90 12.50 62.40 12.60 33.00
11 136.70 140.70 31.70 96.70 75.00 75.20 12.40 62.80 12.50 31.70
12 148.30 143.30 31.70 99.20 75.50 75.30 12.40 62.90 12.60 31.70
13 137.30 143.30 31.80 99.10 74.90 75.20 12.30 62.90 12.50 31.80
14 138.10 142.10 31.00 98.70 74.60 74.80 12.40 62.40 12.50 31.00
15 138.80 141.80 30.80 98.60 74.10 74.30 12.40 61.90 12.50 30.80
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TOT109481  768           
AVG 13685 570 96 137.80 138.00 85.69 39.92 75.01 74.79 12.29 62.49 12.41 8552 59.03
MAX 15291   150.10 149.10 135.70 99.20 76.00 75.40 13.10 62.90 13.10 8865 80.00
MIN 12705   121.70 126.70 30.80 0.80 74.10 73.90 11.80 61.50 12.00 8274 30.80