US Army Corps of Engineers

Bonneville Dam & Lake on Columbia River

October 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 9344 389 96 84.90 87.90 79.20 1.30 75.30 75.30 8.00 67.30 7.90 9282 78.40
2 8961 373 96 85.90 83.90 75.20 1.30 75.60 75.60 7.70 67.90 7.60 8897 74.40
3 8804 367 96 79.30 83.30 74.60 1.30 75.20 75.30 7.90 67.40 7.80 8741 73.80
4 8799 367 96 85.40 83.40 74.70 1.30 75.30 75.20 8.10 67.10 7.90 8737 73.90
5 9402 392 96 89.20 89.20 80.60 1.20 75.30 75.20 8.70 66.50 8.60 9340 79.80
6 9960 415 96 95.70 94.70 86.00 1.20 75.50 75.30 9.10 66.20 9.10 9899 85.30
7 10262 428 96 97.50 97.50 88.70 1.30 75.50 75.30 9.50 65.80 9.50 10201 87.90
8 12217 509 96 118.20 116.20 107.60 1.20 75.60 75.20 10.70 64.50 10.70 11333 99.80
9 8845 369 96 75.50 84.50 76.00 1.20 74.80 75.20 8.80 66.40 8.80 8784 75.20
10 8189 341 96 73.60 78.60 70.00 1.20 74.40 74.70 8.10 66.60 8.00 8127 69.20
11 9511 396 96 93.10 91.10 82.50 1.20 74.40 74.30 8.70 65.60 8.60 9448 81.70
12 10361 432 96 98.80 98.80 90.50 1.20 74.50 74.30 9.00 65.30 9.10 10298 89.70
13 94.90 96.90 89.40 1.20 74.30 74.20 8.80 65.40 8.90 88.60
14 81.30 81.30 73.80 1.20 74.20 74.20 7.50 66.70 7.70 73.00
15 88.40 86.40 78.90 1.20 74.50 74.20 7.70 66.50 7.90 78.10
16 89.40 89.40 81.90 1.20 74.40 74.20 8.00 66.20 8.20 81.10
17 74.50 75.50 68.00 1.20 74.30 74.20 7.40 66.80 7.60 67.20
18 84.20 86.20 78.70 1.20 74.20 74.20 8.10 66.10 8.30 77.90
19 101.60 101.60 94.10 1.20 74.20 74.20 9.10 65.10 9.30 93.30
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TOT114655  1152           
AVG 9555 398 96 89.02 89.81 81.60 1.23 74.82 74.75 8.47 66.28 8.50 9424 80.44
MAX 12217   118.20 116.20 107.60 1.30 75.60 75.60 10.70 67.90 10.70 11333 99.80
MIN 8189   73.60 75.50 68.00 1.20 74.20 74.20 7.40 64.50 7.60 8127 67.20