The Dalles Dam
May 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 |
| 1 | 19747 | 823 | 48 | 228.60 | 233.60 | 136.80 | 91.00 | 157.24 | 158.35 | 78.74 | 79.61 |
| 2 | 17167 | 715 | 48 | 214.90 | 217.40 | 118.60 | 93.00 | 156.76 | 158.08 | 78.48 | 79.60 |
| 3 | 18539 | 772 | 48 | 228.20 | 221.40 | 128.60 | 87.00 | 158.03 | 158.32 | 79.18 | 79.14 |
| 4 | 18668 | 778 | 48 | 223.70 | 223.10 | 128.80 | 88.50 | 158.18 | 158.72 | 79.00 | 79.72 |
| 5 | 20250 | 844 | 48 | 241.30 | 236.70 | 141.90 | 89.00 | 158.99 | 158.35 | 79.69 | 78.66 |
| 6 | 16550 | 690 | 48 | 211.60 | 214.10 | 113.80 | 94.50 | 158.53 | 158.70 | 78.85 | 79.85 |
| 7 | | | | 213.50 | 210.60 | 118.80 | 86.00 | 159.12 | 159.40 | 78.79 | 80.61 |
| 8 | | | | 215.00 | 219.30 | 129.40 | 84.00 | 158.31 | 158.96 | 79.35 | 79.61 |
| 9 | | | | 222.10 | 223.20 | 129.40 | 88.00 | 158.09 | 158.66 | 79.19 | 79.47 |
| 10 | | | | 236.80 | 234.50 | 139.70 | 89.00 | 158.53 | 157.97 | 79.95 | 78.02 |
| 11 | | | | 236.70 | 240.10 | 140.30 | 94.00 | 157.89 | 158.81 | 79.89 | 78.92 |
| 12 | | | | 230.50 | 228.50 | 127.00 | 95.70 | 158.26 | 158.74 | 79.37 | 79.37 |
| 13 | | | | 226.80 | 227.00 | 129.90 | 91.30 | 158.21 | 158.42 | 80.38 | 78.04 |
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| TOT | 110921 | | 288 | | | | | | | | |
| AVG | 18487 | 770 | 48 | 225.36 | 225.35 | 129.46 | 90.08 | 158.16 | 158.58 | 79.30 | 79.28 |
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| MAX | 20250 | | | 241.30 | 240.10 | 141.90 | 95.70 | 159.12 | 159.40 | 80.38 | 80.61 |
| MIN | 16550 | | | 211.60 | 210.60 | 113.80 | 84.00 | 156.76 | 157.97 | 78.48 | 78.02 |