Bonneville Dam
Sunday November 1, 2026
| Hour | Total Outflow kcfs | Generation Flow kcfs | Spill kcfs | PH 1 Forebay Elevation | Tailwater Elevation | Average Head | Project Forebay Elevation | Stevenson Gage Elevation | Project Tailwater Elevation |
|---|
| 1 | 90.20 | 75.40 | 2.40 | 76.00 | 9.50 | 66.50 | 75.90 | 76.30 | 9.70 |
| 2 | 90.10 | 75.30 | 2.40 | 76.00 | 9.40 | 66.60 | 75.90 | 76.30 | 9.60 |
| 3 | 90.90 | 76.10 | 2.40 | 76.00 | 9.30 | 66.70 | 75.90 | 76.30 | 9.50 |
| 4 | 90.00 | 75.20 | 2.40 | 75.90 | 9.00 | 66.90 | 75.80 | 76.20 | 9.30 |
| 5 | 89.50 | 74.70 | 2.40 | 75.90 | 8.90 | 67.00 | 75.70 | 76.20 | 9.10 |
| 6 | 89.60 | 74.80 | 2.40 | 75.80 | 8.80 | 67.00 | 75.70 | 76.10 | 9.00 |
| 7 | 89.90 | 75.10 | 2.40 | 75.90 | 8.80 | 67.10 | 75.70 | 76.20 | 8.80 |
| 8 | 89.10 | 74.30 | 2.40 | 75.90 | 8.50 | 67.40 | 75.70 | 76.20 | 8.60 |
| 9 | 97.80 | 83.00 | 2.40 | 75.80 | 8.70 | 67.10 | 75.70 | 76.20 | 9.00 |
| 10 | 99.00 | 84.20 | 2.40 | 75.80 | 8.70 | 67.10 | 75.70 | 76.20 | 9.00 |
| 11 | 99.60 | 84.80 | 2.40 | 75.80 | 9.00 | 66.80 | 75.70 | 76.20 | 9.00 |
| 12 | 99.90 | 85.10 | 2.40 | 75.80 | 9.00 | 66.80 | 75.70 | 76.10 | 9.20 |
| 13 | 100.00 | 85.20 | 2.40 | 75.70 | 9.40 | 66.30 | 75.60 | 76.10 | 9.60 |
| 14 | 100.40 | 85.60 | 2.40 | 75.70 | 9.60 | 66.10 | 75.60 | 76.10 | 9.80 |
| 15 | 100.30 | 85.50 | 2.40 | 75.70 | 9.50 | 66.20 | 75.60 | 76.00 | 9.80 |
| 16 | 101.20 | 86.40 | 2.40 | 75.60 | 9.60 | 66.00 | 75.50 | 76.00 | 9.80 |
| 17 | 101.00 | 86.20 | 2.40 | 75.60 | 9.50 | 66.10 | 75.50 | 76.00 | 9.70 |
| 18 | 100.30 | 85.50 | 2.40 | 75.80 | 9.30 | 66.50 | 75.70 | 76.00 | 9.50 |
| 19 | 99.70 | 84.90 | 2.40 | 75.90 | 9.20 | 66.70 | 75.80 | 76.20 | 9.40 |
| 20 | 99.00 | 84.20 | 2.40 | 76.00 | 9.00 | 67.00 | 75.80 | 76.30 | 9.30 |
| 21 | 98.50 | 83.70 | 2.40 | 75.90 | 9.00 | 66.90 | 75.80 | 76.30 | 9.20 |
| 22 | 98.80 | 84.00 | 2.40 | 76.20 | 9.00 | 67.20 | 76.10 | 76.50 | 9.40 |
| 23 | 98.60 | 83.80 | 2.40 | 76.10 | 9.20 | 66.90 | 76.00 | 76.50 | 9.50 |
| 24 | 98.50 | 83.70 | 2.40 | 76.20 | 9.50 | 66.70 | 76.00 | 76.50 | 9.80 |
|
| AVG | 96.33 | 81.53 | 2.40 | 75.87 | 9.14 | 66.73 | 75.75 | 76.21 | 9.36 |
|
| MAX | 101.20 | 86.40 | 2.40 | 76.20 | 9.60 | 67.40 | 76.10 | 76.50 | 9.80 |
| MIN | 89.10 | 74.30 | 2.40 | 75.60 | 8.50 | 66.00 | 75.50 | 76.00 | 8.60 |
| |
Powerhouse 1 |
Powerhouse 2 |
Project |
| Hour | Generation Flow kcfs | Forebay Elevation | Forebay Elevation | Generation Flow kcfs | Spillway Gates in Use | Miscellaneous Flow kcfs* |
|---|
| 1 | 8.50 | 76.0 | 75.9 | 66.90 | 2 | 12.4 |
| 2 | 8.40 | 76.0 | 75.9 | 66.90 | 2 | 12.4 |
| 3 | 8.60 | 76.0 | 75.9 | 67.50 | 2 | 12.4 |
| 4 | 8.40 | 75.9 | 75.8 | 66.80 | 2 | 12.4 |
| 5 | 8.20 | 75.9 | 75.7 | 66.50 | 2 | 12.4 |
| 6 | 8.20 | 75.8 | 75.7 | 66.60 | 2 | 12.4 |
| 7 | 8.20 | 75.9 | 75.7 | 66.90 | 2 | 12.4 |
| 8 | 8.20 | 75.9 | 75.7 | 66.10 | 2 | 12.4 |
| 9 | 15.30 | 75.8 | 75.7 | 67.70 | 2 | 12.4 |
| 10 | 18.20 | 75.8 | 75.7 | 66.00 | 2 | 12.4 |
| 11 | 15.80 | 75.8 | 75.7 | 69.00 | 2 | 12.4 |
| 12 | 16.10 | 75.8 | 75.7 | 69.00 | 2 | 12.4 |
| 13 | 18.10 | 75.7 | 75.6 | 67.10 | 2 | 12.4 |
| 14 | 18.30 | 75.7 | 75.6 | 67.30 | 2 | 12.4 |
| 15 | 18.10 | 75.7 | 75.6 | 67.40 | 2 | 12.4 |
| 16 | 18.30 | 75.6 | 75.5 | 68.10 | 2 | 12.4 |
| 17 | 18.20 | 75.6 | 75.5 | 68.00 | 2 | 12.4 |
| 18 | 18.10 | 75.8 | 75.7 | 67.40 | 2 | 12.4 |
| 19 | 18.00 | 75.9 | 75.8 | 66.90 | 2 | 12.4 |
| 20 | 18.00 | 76.0 | 75.8 | 66.20 | 2 | 12.4 |
| 21 | 18.00 | 75.9 | 75.8 | 65.70 | 2 | 12.4 |
| 22 | 18.10 | 76.2 | 76.1 | 65.90 | 2 | 12.4 |
| 23 | 17.90 | 76.1 | 76.0 | 65.90 | 2 | 12.4 |
| 24 | 18.00 | 76.2 | 76.0 | 65.70 | 2 | 12.4 |
|
| AVG | 14.55 | 75.9 | 75.8 | 66.98 | 2 | 12.4 |
|
| MAX | 18.30 | 76.2 | 76.1 | 69.00 | 2 | 12.4 |
| MIN | 8.20 | 75.6 | 75.5 | 65.70 | 2 | 12.4 |
* Miscellaneous Flow includes fish ladders, PH1 sluiceway, navigation lock,
PH2 DSM, UMT, and PH2 corner collector (B2CC). When all routes are in
operation (March-August), total Misc Flow will be ~12.4 kcfs. Flow through
the B2CC is ~5 kcfs, so fluctuations of +/-5 kcfs at any time of year
indicate the B2CC is open/closed.