US Army Corps of Engineers

Bonneville Dam & Lake on Columbia River

September 2020

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 11478 478 96 107.20 108.20 99.70 1.20 75.80 75.60 10.00 65.60 10.00 10921 94.80
2 13024 543 96 123.00 123.00 114.60 1.10 75.80 75.50 11.00 64.50 11.10 12136 106.80
3 11606 484 96 110.50 109.50 101.10 1.00 75.90 75.50 10.20 65.30 10.30 11310 98.30
4 11345 473 96 104.60 107.60 98.60 1.60 75.70 75.40 10.10 65.30 10.20 11280 97.80
5 10794 450 96 87.90 103.90 95.10 1.40 74.00 74.30 9.90 64.40 9.90 10725 94.20
6 10958 457 96 121.90 104.90 96.10 1.40 75.40 74.50 9.70 64.80 9.70 10887 95.20
7 11568 482 96 109.50 108.50 99.60 1.40 75.90 75.60 9.60 66.00 9.60 11227 96.50
8 12407 517 96 116.20 115.20 106.40 1.40 76.00 75.60 9.60 66.00 9.60 11083 95.30
9 10843 452 96 97.70 100.70 91.90 1.40 75.60 75.50 8.70 66.80 8.60 10480 88.60
10 12439 518 96 116.50 115.50 106.70 1.40 75.70 75.70 9.80 65.90 10.00 10780 92.80
11 10878 453 96 101.70 101.70 93.00 1.40 75.80 75.60 9.30 66.30 9.20 10808 92.10
12 12010 500 96 107.50 112.50 103.70 1.40 75.20 75.50 9.90 65.60 9.90 11043 95.40
13 12522 522 96 120.00 118.00 109.20 1.40 75.50 75.30 10.50 64.80 10.50 10813 94.50
14 11779 491 96 126.10 125.10 116.30 1.40 75.60 75.20 10.40 64.80 10.50 9671 98.50
15 112.70 113.70 104.90 1.40 75.50 75.50 10.00 65.50 10.10 88.10
16 94.30 96.30 87.50 1.40 75.30 75.30 9.30 66.00 9.30 84.10
17 109.20 110.20 101.50 1.30 75.10 75.00 10.20 64.80 10.30 92.40
18 118.80 116.80 108.10 1.40 75.30 74.90 10.90 64.00 11.10 96.30
19 97.80 96.80 88.10 1.30 75.40 75.50 9.70 65.80 9.80 77.90
20 88.20 91.20 82.50 1.30 75.10 75.00 8.90 66.10 9.10 65.60
21 85.90 86.90 78.20 1.30 75.00 75.00 8.50 66.50 8.60 60.70
22
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29
30
TOT163651  1344           
AVG 11689 487 96 107.49 107.91 99.18 1.35 75.46 75.29 9.82 65.47 9.88 10940 90.76
MAX 13024   126.10 125.10 116.30 1.60 76.00 75.70 11.00 66.80 11.10 12136 106.80
MIN 10794   85.90 86.90 78.20 1.00 74.00 74.30 8.50 64.00 8.60 9671 60.70