Bonneville Dam
Thursday August 6, 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 | 128.50 | 30.70 | 85.40 | 75.70 | 11.90 | 63.80 | 75.60 | 76.20 | 11.90 |
| 2 | 128.60 | 30.80 | 85.40 | 75.60 | 12.20 | 63.40 | 75.60 | 76.10 | 12.20 |
| 3 | 128.70 | 30.90 | 85.40 | 75.60 | 12.20 | 63.40 | 75.50 | 76.10 | 12.20 |
| 4 | 128.70 | 30.90 | 85.40 | 75.50 | 12.10 | 63.40 | 75.40 | 76.00 | 12.20 |
| 5 | 128.80 | 31.10 | 85.30 | 75.50 | 12.20 | 63.30 | 75.30 | 76.00 | 12.10 |
| 6 | 129.10 | 31.40 | 85.30 | 75.40 | 12.10 | 63.30 | 75.30 | 76.00 | 12.10 |
| 7 | 129.70 | 31.80 | 85.50 | 75.30 | 12.10 | 63.20 | 75.20 | 75.80 | 12.10 |
| 8 | 129.90 | 32.00 | 85.50 | 75.20 | 12.10 | 63.10 | 75.10 | 75.70 | 12.10 |
| 9 | 129.90 | 32.10 | 85.40 | 75.20 | 12.00 | 63.20 | 75.10 | 75.70 | 12.00 |
| 10 | 129.90 | 32.20 | 85.30 | 75.10 | 12.00 | 63.10 | 75.00 | 75.60 | 12.00 |
| 11 | 130.10 | 32.60 | 85.10 | 75.00 | 11.90 | 63.10 | 74.90 | 75.50 | 11.90 |
| 12 | 129.70 | 32.30 | 85.00 | 74.90 | 11.80 | 63.10 | 74.70 | 75.40 | 11.90 |
| 13 | 129.40 | 32.10 | 84.90 | 74.80 | 11.80 | 63.00 | 74.70 | 75.30 | 11.80 |
| 14 | 129.40 | 32.10 | 84.90 | 74.69 | 11.80 | 62.89 | 74.60 | 75.20 | 11.80 |
| 15 | 129.20 | 32.00 | 84.80 | 74.70 | 11.80 | 62.90 | 74.60 | 75.20 | 11.80 |
| 16 | 131.40 | 35.40 | 83.60 | 74.70 | 11.70 | 63.00 | 74.60 | 75.30 | 11.80 |
| 17 | 130.70 | 35.90 | 82.40 | 74.70 | 11.70 | 63.00 | 74.60 | 75.30 | 11.80 |
| 18 | 130.80 | 35.80 | 82.60 | 75.10 | 11.70 | 63.40 | 75.00 | 75.50 | 11.80 |
| 19 | 131.00 | 35.80 | 82.80 | 75.20 | 11.60 | 63.60 | 75.20 | 75.80 | 11.70 |
| 20 | 131.10 | 35.70 | 83.00 | 75.40 | 11.60 | 63.80 | 75.40 | 76.00 | 11.70 |
| 21 | 131.20 | 35.70 | 83.10 | 75.30 | 11.50 | 63.80 | 75.40 | 76.10 | 11.70 |
| 22 | 131.30 | 35.60 | 83.30 | 75.70 | 11.50 | 64.20 | 75.60 | 76.20 | 11.80 |
| 23 | 131.10 | 35.30 | 83.40 | 75.80 | 11.50 | 64.30 | 75.70 | 76.20 | 11.70 |
| 24 | 130.40 | 34.60 | 83.40 | 75.70 | 11.60 | 64.10 | 75.70 | 76.20 | 11.70 |
|
| AVG | 129.94 | 33.12 | 84.42 | 75.24 | 11.85 | 63.39 | 75.16 | 75.77 | 11.91 |
|
| MAX | 131.40 | 35.90 | 85.50 | 75.80 | 12.20 | 64.30 | 75.70 | 76.20 | 12.20 |
| MIN | 128.50 | 30.70 | 82.40 | 74.69 | 11.50 | 62.89 | 74.60 | 75.20 | 11.70 |
| |
Powerhouse 1 |
Powerhouse 2 |
Project |
| Hour | Generation Flow kcfs | Forebay Elevation | Forebay Elevation | Generation Flow kcfs | Spillway Gates in Use | Miscellaneous Flow kcfs* |
|---|
| 1 | 0.00 | 75.7 | 75.6 | 30.70 | 18 | 12.4 |
| 2 | 0.00 | 75.6 | 75.6 | 30.80 | 18 | 12.4 |
| 3 | 0.00 | 75.6 | 75.5 | 30.90 | 18 | 12.4 |
| 4 | 0.00 | 75.5 | 75.4 | 30.90 | 18 | 12.4 |
| 5 | 0.00 | 75.5 | 75.3 | 31.10 | 18 | 12.4 |
| 6 | 0.00 | 75.4 | 75.3 | 31.40 | 18 | 12.4 |
| 7 | 0.00 | 75.3 | 75.2 | 31.80 | 18 | 12.4 |
| 8 | 0.00 | 75.2 | 75.1 | 32.00 | 18 | 12.4 |
| 9 | 0.00 | 75.2 | 75.1 | 32.10 | 18 | 12.4 |
| 10 | 0.10 | 75.1 | 75.0 | 32.10 | 18 | 12.4 |
| 11 | 0.00 | 75.0 | 74.9 | 32.60 | 18 | 12.4 |
| 12 | 0.00 | 74.9 | 74.7 | 32.30 | 18 | 12.4 |
| 13 | 0.00 | 74.8 | 74.7 | 32.10 | 18 | 12.4 |
| 14 | 0.00 | 74.7 | 74.6 | 32.10 | 18 | 12.4 |
| 15 | 0.00 | 74.7 | 74.6 | 32.00 | 18 | 12.4 |
| 16 | 16.00 | 74.7 | 74.6 | 19.40 | 17 | 12.4 |
| 17 | 17.90 | 74.7 | 74.6 | 18.00 | 17 | 12.4 |
| 18 | 17.80 | 75.1 | 75.0 | 18.00 | 17 | 12.4 |
| 19 | 17.80 | 75.2 | 75.2 | 18.00 | 17 | 12.4 |
| 20 | 17.70 | 75.4 | 75.4 | 18.00 | 17 | 12.4 |
| 21 | 17.70 | 75.3 | 75.4 | 18.00 | 17 | 12.4 |
| 22 | 17.60 | 75.7 | 75.6 | 18.00 | 17 | 12.4 |
| 23 | 17.80 | 75.8 | 75.7 | 17.50 | 17 | 12.4 |
| 24 | 18.70 | 75.7 | 75.7 | 15.90 | 17 | 12.4 |
|
| AVG | 6.63 | 75.2 | 75.2 | 26.49 | 18 | 12.4 |
|
| MAX | 18.70 | 75.8 | 75.7 | 32.60 | 18 | 12.4 |
| MIN | 0.00 | 74.7 | 74.6 | 15.90 | 17 | 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.