Chief Joseph Dam
Sunday September 20, 2026
| Hour | Total Outflow kcfs | Generation Flow kcfs | Spill kcfs | Forebay Elevation | Tailwater Elevation | Average Head | Average Forebay Elevation | Average Tailwater Elevation |
|---|
| 1 | 54.20 | 54.20 | 0.00 | 952.50 | 778.20 | 174.30 | 952.50 | 778.30 |
| 2 | 51.10 | 51.10 | 0.00 | 952.60 | 778.00 | 174.60 | 952.50 | 778.40 |
| 3 | 43.50 | 43.50 | 0.00 | 952.50 | 778.90 | 173.60 | 952.50 | 778.10 |
| 4 | 41.80 | 41.80 | 0.00 | 952.20 | 778.30 | 173.90 | 952.40 | 778.20 |
| 5 | 42.00 | 42.00 | 0.00 | 952.30 | 778.30 | 174.00 | 952.30 | 778.30 |
| 6 | 46.40 | 46.40 | 0.00 | 952.30 | 778.50 | 173.80 | 952.30 | 778.60 |
| 7 | 37.50 | 37.50 | 0.00 | 952.40 | 778.40 | 174.00 | 952.40 | 778.10 |
| 8 | 33.60 | 33.60 | 0.00 | 952.40 | 778.30 | 174.10 | 952.40 | 778.20 |
| 9 | 33.00 | 33.00 | 0.00 | 952.40 | 778.10 | 174.30 | 952.40 | 778.30 |
| 10 | 38.20 | 38.20 | 0.00 | 952.40 | 778.30 | 174.10 | 952.40 | 778.40 |
| 11 | 25.10 | 25.10 | 0.00 | 952.70 | 778.20 | 174.50 | 952.50 | 778.00 |
| 12 | 30.00 | 30.00 | 0.00 | 952.60 | 778.10 | 174.50 | 952.70 | 778.20 |
| 13 | 31.80 | 31.80 | 0.00 | 952.50 | 777.80 | 174.70 | 952.60 | 778.10 |
| 14 | 30.80 | 30.80 | 0.00 | 952.60 | 778.90 | 173.70 | 952.60 | 777.90 |
| 15 | 50.10 | 50.10 | 0.00 | 952.50 | 778.40 | 174.10 | 952.60 | 778.70 |
| 16 | 51.90 | 51.90 | 0.00 | 952.50 | 778.60 | 173.90 | 952.50 | 778.50 |
| 17 | 53.60 | 53.60 | 0.00 | 952.70 | 779.40 | 173.30 | 952.60 | 778.70 |
| 18 | 68.10 | 68.10 | 0.00 | 952.50 | 779.60 | 172.90 | 952.70 | 779.30 |
| 19 | 73.00 | 73.00 | 0.00 | 952.80 | 779.20 | 173.60 | 952.70 | 779.30 |
| 20 | 71.60 | 71.60 | 0.00 | 952.90 | 779.30 | 173.60 | 952.90 | 779.30 |
| 21 | 74.20 | 74.20 | 0.00 | 953.00 | 779.30 | 173.70 | 952.90 | 779.50 |
| 22 | 70.20 | 70.20 | 0.00 | 953.00 | 779.30 | 173.70 | 953.00 | 779.50 |
| 23 | 61.00 | 61.00 | 0.00 | 953.10 | 779.30 | 173.80 | 953.10 | 779.30 |
| 24 | 56.30 | 56.30 | 0.00 | 953.00 | 779.20 | 173.80 | 953.00 | 779.30 |
|
| AVG | 48.71 | 48.71 | 0.00 | 952.60 | 778.66 | 173.94 | 952.60 | 778.60 |
|
| MAX | 74.20 | 74.20 | 0.00 | 953.10 | 779.60 | 174.70 | 953.10 | 779.50 |
| MIN | 25.10 | 25.10 | 0.00 | 952.20 | 777.80 | 172.90 | 952.30 | 777.90 |