Bonneville Dam
Tuesday March 10, 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 | 193.60 | 186.60 | 0.00 | 75.70 | 16.80 | 58.90 | 75.80 | 76.70 | 16.70 |
| 2 | 193.70 | 186.70 | 0.00 | 75.60 | 16.90 | 58.70 | 75.60 | 76.60 | 16.70 |
| 3 | 195.10 | 188.10 | 0.00 | 75.40 | 16.90 | 58.50 | 75.50 | 76.50 | 16.80 |
| 4 | 196.00 | 189.00 | 0.00 | 75.30 | 16.80 | 58.50 | 75.30 | 76.30 | 16.80 |
| 5 | 190.80 | 183.80 | 0.00 | 75.30 | 16.60 | 58.70 | 75.30 | 76.30 | 16.50 |
| 6 | 190.50 | 183.50 | 0.00 | 75.30 | 16.60 | 58.70 | 75.30 | 76.30 | 16.60 |
| 7 | 196.10 | 184.00 | 0.10 | 75.30 | 16.80 | 58.50 | 75.30 | 76.30 | 16.80 |
| 8 | 198.40 | 184.00 | 2.40 | 75.40 | 16.80 | 58.60 | 75.40 | 76.40 | 16.80 |
| 9 | 197.90 | 183.50 | 2.40 | 75.40 | 16.90 | 58.50 | 75.40 | 76.40 | 16.80 |
| 10 | 198.10 | 183.70 | 2.40 | 75.40 | 16.90 | 58.50 | 75.40 | 76.40 | 16.80 |
| 11 | 188.60 | 174.20 | 2.40 | 75.60 | 16.30 | 59.30 | 75.80 | 76.50 | 16.20 |
| 12 | 184.20 | 169.80 | 2.40 | 75.60 | 16.30 | 59.30 | 75.60 | 76.60 | 16.50 |
| 13 | 183.20 | 168.80 | 2.40 | 75.50 | 16.30 | 59.20 | 75.60 | 76.50 | 16.20 |
| 14 | 183.60 | 169.20 | 2.40 | 75.30 | 16.30 | 59.00 | 75.40 | 76.40 | 16.30 |
| 15 | 184.30 | 169.90 | 2.40 | 75.20 | 16.30 | 58.90 | 75.30 | 76.30 | 16.30 |
| 16 | 185.80 | 171.40 | 2.40 | 75.20 | 16.50 | 58.70 | 75.20 | 76.20 | 16.30 |
| 17 | 198.50 | 183.60 | 2.90 | 74.90 | 17.10 | 57.80 | 75.00 | 76.00 | 16.80 |
| 18 | 201.10 | 186.80 | 2.30 | 74.70 | 17.10 | 57.60 | 74.70 | 75.80 | 16.90 |
| 19 | 202.10 | 187.80 | 2.30 | 74.70 | 17.20 | 57.50 | 74.70 | 75.80 | 17.00 |
| 20 | 201.40 | 187.10 | 2.30 | 74.70 | 17.10 | 57.60 | 74.80 | 75.80 | 16.90 |
| 21 | 193.60 | 185.40 | 1.20 | 75.00 | 16.70 | 58.30 | 75.00 | 75.90 | 16.50 |
| 22 | 191.90 | 184.90 | 0.00 | 75.00 | 16.60 | 58.40 | 75.00 | 76.00 | 16.50 |
| 23 | 191.00 | 184.00 | 0.00 | 75.00 | 16.50 | 58.50 | 75.00 | 76.00 | 16.40 |
| 24 | 191.80 | 184.80 | 0.00 | 74.90 | 16.60 | 58.30 | 74.90 | 75.90 | 16.40 |
|
| AVG | 192.97 | 181.69 | 1.36 | 75.23 | 16.70 | 58.52 | 75.26 | 76.25 | 16.60 |
|
| MAX | 202.10 | 189.00 | 2.90 | 75.70 | 17.20 | 59.30 | 75.80 | 76.70 | 17.00 |
| MIN | 183.20 | 168.80 | 0.00 | 74.70 | 16.30 | 57.50 | 74.70 | 75.80 | 16.20 |
| |
Powerhouse 1 |
Powerhouse 2 |
Project |
| Hour | Generation Flow kcfs | Forebay Elevation | Forebay Elevation | Generation Flow kcfs | Spillway Gates in Use | Miscellaneous Flow kcfs* |
|---|
| 1 | 79.60 | 75.7 | 75.8 | 107.00 | 0 | 7.0 |
| 2 | 79.70 | 75.6 | 75.6 | 107.00 | 0 | 7.0 |
| 3 | 80.00 | 75.4 | 75.5 | 108.10 | 0 | 7.0 |
| 4 | 80.50 | 75.3 | 75.3 | 108.50 | 0 | 7.0 |
| 5 | 75.50 | 75.3 | 75.3 | 108.30 | 0 | 7.0 |
| 6 | 75.50 | 75.3 | 75.3 | 108.00 | 0 | 7.0 |
| 7 | 75.90 | 75.3 | 75.3 | 108.10 | 0 | 12.0 |
| 8 | 76.20 | 75.4 | 75.4 | 107.80 | 0 | 12.0 |
| 9 | 76.60 | 75.4 | 75.4 | 106.90 | 0 | 12.0 |
| 10 | 76.00 | 75.4 | 75.4 | 107.70 | 2 | 12.0 |
| 11 | 79.50 | 75.6 | 75.8 | 94.70 | 2 | 12.0 |
| 12 | 75.70 | 75.6 | 75.6 | 94.10 | 2 | 12.0 |
| 13 | 70.70 | 75.5 | 75.6 | 98.10 | 2 | 12.0 |
| 14 | 79.50 | 75.3 | 75.4 | 89.70 | 2 | 12.0 |
| 15 | 73.30 | 75.2 | 75.3 | 96.60 | 2 | 12.0 |
| 16 | 68.20 | 75.2 | 75.2 | 103.20 | 2 | 12.0 |
| 17 | 75.00 | 74.9 | 75.0 | 108.60 | 2 | 12.0 |
| 18 | 76.90 | 74.7 | 74.7 | 109.90 | 2 | 12.0 |
| 19 | 77.70 | 74.7 | 74.7 | 110.10 | 2 | 12.0 |
| 20 | 77.50 | 74.7 | 74.8 | 109.60 | 2 | 12.0 |
| 21 | 76.70 | 75.0 | 75.0 | 108.70 | 0 | 7.0 |
| 22 | 76.40 | 75.0 | 75.0 | 108.50 | 0 | 7.0 |
| 23 | 76.00 | 75.0 | 75.0 | 108.00 | 0 | 7.0 |
| 24 | 76.50 | 74.9 | 74.9 | 108.30 | 0 | 7.0 |
|
| AVG | 76.46 | 75.2 | 75.3 | 105.23 | 1 | 9.9 |
|
| MAX | 80.50 | 75.7 | 75.8 | 110.10 | 2 | 12.0 |
| MIN | 68.20 | 74.7 | 74.7 | 89.70 | 0 | 7.0 |
* 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.