Bonneville Dam & Lake on Columbia River
October 2026
| Day of Month | Total Generation MWh | Average Generation MW | Station Use MWh | Inflow kcfs | Total Outflow kcfs | Generation Flow kcfs | Spill kcfs | Midnight Reservoir Elevation | Average Forebay Elevation | Average Tailwater Elevation | Average Head feet | Project Average Tailwater | 2nd Powerhouse Total MWh | 2nd Powerhouse Flow kcfs |
|---|
| 1 | 7241 | 302 | 96 | 84.70 | 74.70 | 60.00 | 2.30 | 75.40 | 74.90 | 7.70 | 67.20 | 7.70 | 6883 | 57.00 |
| 2 | 7762 | 323 | 96 | 81.50 | 78.50 | 63.80 | 2.30 | 75.60 | 75.50 | 7.90 | 67.60 | 7.90 | 7646 | 62.90 |
| 3 | 7499 | 312 | 96 | 69.40 | 76.40 | 61.70 | 2.30 | 75.00 | 75.30 | 7.70 | 67.60 | 7.60 | 7399 | 60.90 |
| 4 | 8058 | 336 | 96 | 84.50 | 81.50 | 66.80 | 2.30 | 75.40 | 75.00 | 8.00 | 67.00 | 7.90 | 7754 | 64.40 |
| 5 | 8357 | 348 | 96 | 84.60 | 84.60 | 69.90 | 2.30 | 75.30 | 75.00 | 8.30 | 66.70 | 8.30 | 7725 | 64.70 |
| 6 | 9166 | 382 | 96 | 91.20 | 92.20 | 77.50 | 2.30 | 75.20 | 74.90 | 8.90 | 66.00 | 8.90 | 7869 | 66.50 |
| 7 | 10084 | 420 | 96 | 99.80 | 100.80 | 86.10 | 2.30 | 75.10 | 74.90 | 9.60 | 65.30 | 9.60 | 7717 | 65.80 |
| 8 | 10302 | 429 | 96 | 105.90 | 102.90 | 88.10 | 2.40 | 75.40 | 75.00 | 9.90 | 65.10 | 10.10 | 8136 | 69.80 |
| 9 | 8784 | 366 | 96 | 88.60 | 88.60 | 73.80 | 2.40 | 75.60 | 75.40 | 9.10 | 66.30 | 9.30 | 7791 | 65.60 |
| 10 | 8387 | 349 | 96 | 84.00 | 85.00 | 70.20 | 2.40 | 75.40 | 75.30 | 8.80 | 66.50 | 8.90 | 7777 | 65.20 |
| 11 | 7759 | 323 | 96 | 81.40 | 79.40 | 64.60 | 2.40 | 75.50 | 75.30 | 8.60 | 66.70 | 8.50 | 7759 | 64.60 |
| 12 | 7491 | 312 | 96 | 77.90 | 76.90 | 62.10 | 2.40 | 75.60 | 75.40 | 8.20 | 67.20 | 8.10 | 7491 | 62.10 |
| 13 | 8417 | 351 | 96 | 83.90 | 84.90 | 70.10 | 2.40 | 75.40 | 75.50 | 8.60 | 66.90 | 8.60 | 7568 | 63.10 |
| 14 | 7804 | 325 | 96 | 83.10 | 79.10 | 64.30 | 2.40 | 75.80 | 75.50 | 8.00 | 67.50 | 8.00 | 7546 | 62.20 |
| 15 | 8329 | 347 | 96 | 78.30 | 83.30 | 68.50 | 2.40 | 75.40 | 75.50 | 7.80 | 67.70 | 7.80 | 7795 | 64.50 |
| 16 | 7371 | 307 | 96 | 78.60 | 74.60 | 59.80 | 2.40 | 75.70 | 75.70 | 7.10 | 68.60 | 7.00 | 7254 | 58.90 |
| 17 | 6998 | 292 | 96 | 68.70 | 71.70 | 56.90 | 2.40 | 75.50 | 75.80 | 7.20 | 68.60 | 7.10 | 6998 | 56.90 |
| 18 | 6960 | 290 | 96 | 69.50 | 71.50 | 56.70 | 2.40 | 75.30 | 75.40 | 6.90 | 68.50 | 6.80 | 6960 | 56.70 |
| 19 | | | | 72.60 | 71.60 | 56.80 | 2.40 | 75.40 | 75.20 | 6.90 | 68.30 | 6.80 | | 56.80 |
| 20 | | | | 71.90 | 71.90 | 57.10 | 2.40 | 75.40 | 75.40 | 6.80 | 68.60 | 6.70 | | 57.10 |
| 21 | | | | 77.40 | 75.40 | 60.60 | 2.40 | 75.60 | 75.50 | 7.10 | 68.40 | 7.00 | | 58.10 |
| 22 | | | | 70.30 | 74.30 | 59.50 | 2.40 | 75.30 | 75.50 | 7.60 | 67.90 | 7.50 | | 59.50 |
| 23 | | | | 81.10 | 73.10 | 58.30 | 2.40 | 76.00 | 75.70 | 7.50 | 68.20 | 7.30 | | 58.30 |
| 24 | | | | 73.30 | 82.30 | 67.50 | 2.40 | 75.20 | 75.70 | 8.00 | 67.70 | 8.00 | | 62.40 |
| 25 | | | | 77.20 | 80.20 | 65.40 | 2.40 | 74.90 | 74.90 | 8.10 | 66.80 | 8.00 | | 65.00 |
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| 1 | | | | | | | | | | | | | | |
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| TOT | 146769 | | 1728 | | | | | | | | | | | |
| AVG | 8154 | 340 | 96 | 80.78 | 80.62 | 65.84 | 2.37 | 75.42 | 75.33 | 8.01 | 67.32 | 7.98 | 7559 | 61.96 |
|
| MAX | 10302 | | | 105.90 | 102.90 | 88.10 | 2.40 | 76.00 | 75.80 | 9.90 | 68.60 | 10.10 | 8136 | 69.80 |
| MIN | 6960 | | | 68.70 | 71.50 | 56.70 | 2.30 | 74.90 | 74.90 | 6.80 | 65.10 | 6.70 | 6883 | 56.70 |