Bonneville Dam & Lake on Columbia River
September 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 | 8841 | 368 | 96 | 86.30 | 90.30 | 75.20 | 2.80 | 75.60 | 75.70 | 9.30 | 66.40 | 9.20 | 8547 | 72.70 |
| 2 | 8690 | 362 | 96 | 92.10 | 88.10 | 73.30 | 2.40 | 76.00 | 75.80 | 9.10 | 66.70 | 9.00 | 7178 | 61.00 |
| 3 | 8605 | 359 | 96 | 89.70 | 86.70 | 72.00 | 2.30 | 76.40 | 76.00 | 8.90 | 67.10 | 8.80 | 6330 | 53.50 |
| 4 | 9829 | 410 | 96 | 97.80 | 97.80 | | 2.30 | | | 9.60 | | 9.50 | 7616 | 64.90 |
| 5 | 7758 | 323 | 96 | 76.70 | 78.70 | 64.00 | 2.30 | 76.10 | 76.10 | 8.20 | 67.90 | 8.00 | 5502 | 45.80 |
| 6 | 7468 | 311 | 96 | 73.90 | 75.90 | 61.20 | 2.30 | 75.90 | 76.10 | 8.00 | 68.10 | 7.80 | 5178 | 43.00 |
| 7 | 7023 | 293 | 96 | 70.80 | 72.80 | 58.10 | 2.30 | 75.70 | 75.70 | 7.80 | 67.90 | 7.60 | 4808 | 40.30 |
| 8 | 7880 | 328 | 96 | 83.20 | 80.20 | 65.50 | 2.30 | 76.00 | 75.80 | 8.20 | 67.60 | 8.00 | 5635 | 47.40 |
| 9 | 7833 | 326 | 96 | 78.60 | 79.60 | 64.90 | 2.40 | 75.90 | 76.00 | 8.20 | 67.80 | 8.10 | 5556 | 46.60 |
| 10 | 8088 | 337 | 96 | 85.10 | 82.10 | 67.40 | 2.40 | 76.10 | 75.90 | 8.60 | 67.30 | 8.50 | 5813 | 48.90 |
| 11 | 7350 | 306 | 96 | 73.40 | 76.40 | 61.70 | 2.40 | 75.90 | 75.90 | 8.40 | 67.50 | 8.30 | 6584 | 55.50 |
| 12 | 7390 | 308 | 96 | 76.20 | 77.20 | 62.50 | 2.30 | 75.80 | 75.60 | 8.40 | 67.20 | 8.20 | 7390 | 62.50 |
| 13 | 7332 | 306 | 96 | 75.80 | 76.80 | 62.10 | 2.30 | 75.70 | 75.50 | 8.40 | 67.10 | 8.20 | 7332 | 62.10 |
| 14 | | | | 72.70 | 76.70 | 61.90 | 2.30 | 75.30 | 75.30 | 8.20 | 67.10 | 8.10 | | 60.70 |
| 15 | | | | 73.40 | 71.40 | 56.70 | 2.30 | 75.50 | 75.40 | 7.50 | 67.90 | 7.50 | | 56.70 |
| 16 | | | | 74.50 | 72.60 | 57.90 | 2.30 | 75.60 | 75.50 | 7.40 | 68.10 | 7.30 | | 57.90 |
| 17 | | | | 71.60 | 72.60 | 57.90 | 2.30 | 75.50 | 75.40 | 7.20 | 68.20 | 7.00 | | 57.90 |
| 18 | | | | 73.50 | 72.50 | 57.80 | 2.30 | 75.70 | 75.40 | 7.10 | 68.30 | 7.00 | | 57.80 |
| 19 | | | | 77.20 | 75.20 | 60.50 | 2.40 | 75.90 | 75.80 | 7.30 | 68.50 | 7.10 | | 60.50 |
| 20 | | | | 76.60 | 74.60 | 59.80 | 2.40 | 76.10 | 76.00 | 7.30 | 68.70 | 7.10 | | 59.80 |
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| TOT | 104087 | | 1248 | | | | | | | | | | | |
| AVG | 8007 | 334 | 96 | 78.96 | 78.91 | 63.18 | 2.35 | 75.83 | 75.73 | 8.16 | 67.65 | 8.01 | 6421 | 55.77 |
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| MAX | 9829 | | | 97.80 | 97.80 | 75.20 | 2.80 | 76.40 | 76.10 | 9.60 | 68.70 | 9.50 | 8547 | 72.70 |
| MIN | 7023 | | | 70.80 | 71.40 | 56.70 | 2.30 | 75.30 | 75.30 | 7.10 | 66.40 | 7.00 | 4808 | 40.30 |