Bonneville Dam & Lake on Columbia River
September 2025
| 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 | 10207 | 425 | 96 | 103.10 | 98.10 | 87.10 | 3.60 | 75.70 | 75.30 | 9.10 | 66.20 | 9.00 | 8667 | 74.40 |
| 2 | 11077 | 462 | 96 | 103.00 | 103.00 | 94.00 | 1.50 | 75.70 | 75.80 | 9.30 | 66.50 | 9.30 | 8836 | 75.60 |
| 3 | 10029 | 418 | 96 | 95.50 | 93.50 | 85.00 | 1.10 | 75.90 | 75.70 | 9.00 | 66.70 | 8.90 | 9350 | 79.40 |
| 4 | 10131 | 422 | 96 | 92.10 | 95.10 | 86.30 | 1.50 | 75.60 | 75.60 | 9.00 | 66.60 | 8.90 | 10131 | 86.30 |
| 5 | 9671 | 403 | 96 | 93.90 | 90.90 | 82.00 | 1.50 | 76.00 | 75.60 | 9.00 | 66.60 | 8.90 | 9671 | 82.00 |
| 6 | 8813 | 367 | 96 | 82.30 | 83.30 | 74.40 | 1.50 | 75.80 | 75.70 | 8.70 | 67.00 | 8.50 | 8813 | 74.40 |
| 7 | 8286 | 345 | 96 | 75.90 | 77.90 | 68.90 | 1.50 | 75.60 | 75.70 | 8.10 | 67.60 | 7.90 | 8286 | 68.90 |
| 8 | 7970 | 332 | 96 | 73.00 | 75.00 | 66.00 | 1.50 | 75.40 | 75.50 | 7.80 | 67.70 | 7.70 | 6382 | 53.20 |
| 9 | 7653 | 319 | 96 | 73.90 | 71.90 | 63.00 | 1.50 | 75.60 | 75.40 | 7.70 | 67.70 | 7.60 | 5343 | 44.40 |
| 10 | | | | 71.00 | 73.00 | 64.10 | 1.50 | 75.50 | 75.40 | 7.80 | 67.60 | 7.60 | | 45.20 |
| 11 | | | | 82.00 | 78.00 | 69.20 | 1.50 | 75.80 | 75.50 | 8.10 | 67.40 | 8.00 | | 50.50 |
| 12 | | | | 82.10 | 81.10 | 72.20 | 1.50 | 76.00 | 75.70 | 8.20 | 67.50 | 8.00 | | 53.30 |
| 13 | | | | 81.00 | 85.00 | 76.20 | 1.50 | 75.60 | 75.40 | 8.40 | 67.00 | 8.30 | | 58.10 |
| 14 | | | | 79.70 | 78.70 | 69.80 | 1.50 | 75.70 | 75.40 | 8.00 | 67.40 | 7.90 | | 64.50 |
| 15 | | | | 75.60 | 73.60 | 64.70 | 1.50 | 75.90 | 75.50 | 7.30 | 68.20 | 7.20 | | 64.70 |
| 16 | | | | 79.10 | 82.10 | 73.20 | 1.50 | 75.50 | 75.50 | 7.40 | 68.10 | 7.30 | | 73.20 |
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| TOT | 83837 | | 864 | | | | | | | | | | | |
| AVG | 9315 | 388 | 96 | 83.95 | 83.76 | 74.76 | 1.61 | 75.71 | 75.54 | 8.31 | 67.24 | 8.19 | 8387 | 65.51 |
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| MAX | 11077 | | | 103.10 | 103.00 | 94.00 | 3.60 | 76.00 | 75.80 | 9.30 | 68.20 | 9.30 | 10131 | 86.30 |
| MIN | 7653 | | | 71.00 | 71.90 | 63.00 | 1.10 | 75.40 | 75.30 | 7.30 | 66.20 | 7.20 | 5343 | 44.40 |