Bonneville Dam
Monday June 22, 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 | 139.70 | 30.50 | 96.80 | 75.30 | 12.80 | 62.50 | 75.10 | 75.90 | 12.80 |
| 2 | 139.60 | 30.60 | 96.60 | 75.20 | 12.90 | 62.30 | 75.10 | 75.80 | 12.90 |
| 3 | 139.60 | 30.60 | 96.60 | 75.20 | 13.00 | 62.20 | 75.10 | 75.80 | 13.00 |
| 4 | 139.60 | 30.70 | 96.50 | 75.20 | 13.10 | 62.10 | 75.10 | 75.80 | 13.10 |
| 5 | 139.70 | 30.80 | 96.50 | 75.10 | 13.10 | 62.00 | 75.00 | 75.70 | 13.10 |
| 6 | 139.70 | 30.90 | 96.40 | 75.10 | 13.00 | 62.10 | 74.90 | 75.60 | 13.10 |
| 7 | 139.80 | 31.10 | 96.30 | 75.00 | 13.00 | 62.00 | 74.90 | 75.60 | 13.10 |
| 8 | 139.90 | 31.20 | 96.30 | 74.90 | 13.00 | 61.90 | 74.80 | 75.50 | 12.90 |
| 9 | 139.80 | 31.20 | 96.20 | 75.00 | 12.90 | 62.10 | 74.80 | 75.50 | 12.90 |
| 10 | 139.60 | 31.00 | 96.20 | 74.90 | 12.80 | 62.10 | 74.70 | 75.50 | 12.80 |
| 11 | 139.80 | 31.20 | 96.20 | 74.90 | 12.80 | 62.10 | 74.70 | 75.50 | 12.80 |
| 12 | 139.50 | 31.00 | 96.10 | 74.80 | 12.90 | 61.90 | 74.50 | 75.40 | 12.80 |
| 13 | 139.50 | 31.10 | 96.00 | 74.30 | 12.80 | 61.50 | 74.50 | 75.30 | 12.70 |
| 14 | 139.50 | 31.20 | 95.90 | 74.60 | 12.40 | 62.20 | 74.50 | 75.20 | 12.80 |
| 15 | 139.60 | 31.40 | 95.80 | 74.60 | 12.70 | 61.90 | 74.50 | 75.20 | 12.70 |
| 16 | 140.50 | 32.30 | 95.80 | 74.50 | 12.70 | 61.80 | 74.50 | 75.20 | 12.70 |
| 17 | 162.40 | 54.60 | 95.40 | 73.60 | 13.30 | 60.30 | 73.90 | 75.10 | 13.30 |
| 18 | 158.00 | 50.20 | 95.40 | 74.40 | 13.60 | 60.80 | 74.30 | 75.00 | 13.60 |
| 19 | 156.50 | 48.30 | 95.80 | 74.60 | 13.60 | 61.00 | 74.60 | 75.30 | 13.60 |
| 20 | 156.90 | 48.50 | 96.00 | 74.70 | 13.50 | 61.20 | 74.60 | 75.50 | 13.70 |
| 21 | 157.10 | 48.50 | 96.20 | 74.90 | 13.60 | 61.30 | 74.80 | 75.50 | 13.60 |
| 22 | 157.30 | 48.60 | 96.30 | 75.00 | 13.80 | 61.20 | 75.00 | 75.70 | 13.70 |
| 23 | 156.20 | 47.30 | 96.50 | 75.20 | 13.50 | 61.70 | 75.10 | 75.80 | 13.50 |
| 24 | 160.00 | 51.00 | 96.60 | 75.10 | 13.80 | 61.30 | 75.10 | 75.80 | 13.80 |
|
| AVG | 145.83 | 37.24 | 96.18 | 74.84 | 13.11 | 61.73 | 74.75 | 75.51 | 13.13 |
|
| MAX | 162.40 | 54.60 | 96.80 | 75.30 | 13.80 | 62.50 | 75.10 | 75.90 | 13.80 |
| MIN | 139.50 | 30.50 | 95.40 | 73.60 | 12.40 | 60.30 | 73.90 | 75.00 | 12.70 |
| |
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 | 75.3 | 75.1 | 30.50 | 18 | 12.4 |
| 2 | 0.00 | 75.2 | 75.1 | 30.60 | 18 | 12.4 |
| 3 | 0.00 | 75.2 | 75.1 | 30.60 | 18 | 12.4 |
| 4 | 0.00 | 75.2 | 75.1 | 30.70 | 18 | 12.4 |
| 5 | 0.00 | 75.1 | 75.0 | 30.80 | 18 | 12.4 |
| 6 | 0.00 | 75.1 | 74.9 | 30.90 | 18 | 12.4 |
| 7 | 0.00 | 75.0 | 74.9 | 31.10 | 18 | 12.4 |
| 8 | 0.00 | 74.9 | 74.8 | 31.20 | 18 | 12.4 |
| 9 | 0.00 | 75.0 | 74.8 | 31.20 | 18 | 12.4 |
| 10 | 0.00 | 74.9 | 74.7 | 31.00 | 18 | 12.4 |
| 11 | 0.00 | 74.9 | 74.7 | 31.20 | 18 | 12.4 |
| 12 | 0.00 | 74.8 | 74.5 | 31.00 | 18 | 12.4 |
| 13 | 0.00 | 74.3 | 74.5 | 31.10 | 18 | 12.4 |
| 14 | 0.00 | 74.6 | 74.5 | 31.20 | 18 | 12.4 |
| 15 | 0.00 | 74.6 | 74.5 | 31.40 | 18 | 12.4 |
| 16 | 0.00 | 74.5 | 74.5 | 32.30 | 18 | 12.4 |
| 17 | 0.00 | 73.6 | 73.9 | 54.60 | 18 | 12.4 |
| 18 | 0.00 | 74.4 | 74.3 | 50.20 | 18 | 12.4 |
| 19 | 0.00 | 74.6 | 74.6 | 48.30 | 18 | 12.4 |
| 20 | 0.00 | 74.7 | 74.6 | 48.50 | 18 | 12.4 |
| 21 | 0.00 | 74.9 | 74.8 | 48.50 | 18 | 12.4 |
| 22 | 0.00 | 75.0 | 75.0 | 48.60 | 18 | 12.4 |
| 23 | 0.00 | 75.2 | 75.1 | 47.30 | 18 | 12.4 |
| 24 | 0.00 | 75.1 | 75.1 | 51.00 | 18 | 12.4 |
|
| AVG | 0.00 | 74.8 | 74.8 | 37.24 | 18 | 12.4 |
|
| MAX | 0.00 | 75.3 | 75.1 | 54.60 | 18 | 12.4 |
| MIN | 0.00 | 73.6 | 73.9 | 30.50 | 18 | 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.