US Army Corps of Engineers

Bonneville Dam & Lake on Columbia River

May 2023

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 6236 260 96 222.40 224.40 62.80 149.20 74.50 74.50 18.10 56.40 18.10 6236 62.70
2 9838 410 96 259.50 265.50 104.30 148.90 73.90 74.20 20.60 53.60 20.50 8899 94.50
3 13305 554 96 305.20 309.20 149.00 147.80 73.50 73.50 23.10 50.40 22.70 8926 101.00
4 14937 622 96 347.40 330.40 169.50 148.50 75.20 74.10 24.50 49.60 23.90 8693 100.10
5 15666 653 96 330.10 340.10 178.30 149.40 74.20 74.60 25.20 49.40 24.60 8709 100.60
6 16603 692 96 354.30 356.30 195.30 148.60 74.00 74.10 25.80 48.30 25.20 9095 108.50
7 16864 703 96 366.30 361.30 200.10 148.80 74.60 74.10 26.20 47.90 25.60 9351 112.70
8 16275 678 96 351.00 351.00 189.70 148.80 74.60 74.40 25.80 48.60 25.20 8548 100.80
9 16431 685 96 358.90 350.90 188.50 150.00 75.40 75.20 25.70 49.50 25.10 8380 97.30
10 16920 705 96 350.60 360.60 198.90 149.30 74.00 74.50 26.10 48.40 25.50 9149 109.00
11 16272 678 96 350.30 353.30 191.50 149.40 73.40 74.10 25.70 48.40 25.10 8823 105.60
12 14689 612 96 335.60 330.60 169.20 149.00 74.10 73.70 24.70 49.00 24.10 8278 97.00
13 14895 621 96 327.20 332.20 171.10 148.70 73.50 73.50 24.40 49.10 23.90 8261 96.70
14 15483 645 96 344.60 341.60 181.00 148.20 73.80 73.10 24.80 48.30 24.30 8752 104.10
15 16775 699 96 361.30 363.30 201.70 149.20 73.60 73.40 25.80 47.60 25.20 9384 114.70
16 17733 739 96 400.60 398.60 225.30 160.90 73.60 73.50 27.60 45.90 27.00 9797 125.60
17 17601 733 96 426.20 426.20 233.20 180.60 73.70 73.70 29.00 44.70 28.20 9387 124.00
18 12515 521 96 422.30 424.30 165.60 246.30 73.60 73.60 29.00 44.60 28.50 6209 83.00
19 15773 657 96 423.60 425.60 209.80 203.40 73.20 73.50 29.10 44.40 28.50 9239 123.60
20 17346 723 96 434.00 420.00 227.90 179.70 74.60 73.60 28.90 44.70 28.20 9455 124.90
21 418.80 421.80 212.30 197.20 74.50 74.70 29.00 45.70 28.20 108.60
22 427.50 432.50 209.90 210.20 74.10 74.20 29.40 44.80 28.70 104.50
23 421.70 421.70 216.00 193.30 74.00 73.60 28.90 44.70 28.30 110.60
24 400.90 394.90 216.60 166.00 74.30 74.30 27.80 46.50 27.10 114.30
25 371.60 369.60 206.00 151.20 74.80 74.50 26.40 48.10 25.80 115.20
26 338.90 348.90 187.10 149.30 74.00 73.90 25.30 48.60 24.70 103.10
27 301.90 290.90 127.50 151.10 75.00 74.20 22.50 51.70 22.30 95.30
28
29
30
31
TOT302157  1920           
AVG 15108 629 96 361.21 360.95 184.74 163.81 74.14 74.01 25.90 48.11 25.35 8679 105.11
MAX 17733   434.00 432.50 233.20 246.30 75.40 75.20 29.40 56.40 28.70 9797 125.60
MIN 6236   222.40 224.40 62.80 147.80 73.20 73.10 18.10 44.40 18.10 6209 62.70