Bonneville Dam
Tuesday September 2, 2025
| 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 | 76.90 | 69.50 | 0.00 | 75.80 | 8.00 | 67.80 | 75.70 | 76.00 | 7.90 |
| 2 | 75.90 | 68.50 | 0.00 | 75.80 | 8.20 | 67.60 | 75.70 | 76.10 | 8.10 |
| 3 | 75.90 | 68.50 | 0.00 | 75.80 | 8.30 | 67.50 | 75.60 | 76.00 | 8.20 |
| 4 | 76.00 | 68.60 | 0.00 | 75.70 | 8.30 | 67.40 | 75.60 | 75.90 | 8.20 |
| 5 | 76.10 | 68.70 | 0.00 | 75.70 | 8.20 | 67.50 | 75.60 | 76.00 | 8.10 |
| 6 | 76.20 | 68.80 | 0.00 | 75.60 | 8.00 | 67.60 | 75.40 | 76.00 | 7.90 |
| 7 | 77.10 | 68.40 | 1.30 | 75.60 | 8.00 | 67.60 | 75.50 | 76.00 | 7.90 |
| 8 | 81.60 | 71.70 | 2.50 | 75.80 | 8.10 | 67.70 | 75.70 | 76.10 | 8.10 |
| 9 | 93.60 | 83.70 | 2.50 | 75.90 | 8.50 | 67.40 | 75.80 | 76.20 | 8.40 |
| 10 | 96.50 | 86.60 | 2.50 | 75.90 | 8.60 | 67.30 | 75.70 | 76.20 | 8.40 |
| 11 | 96.10 | 86.20 | 2.50 | 75.90 | 8.50 | 67.40 | 75.70 | 76.20 | 8.40 |
| 12 | 97.00 | 87.10 | 2.50 | 75.90 | 8.50 | 67.40 | 75.80 | 76.30 | 8.40 |
| 13 | 97.70 | 87.80 | 2.50 | 75.80 | 8.60 | 67.20 | 75.70 | 76.20 | 8.50 |
| 14 | 109.10 | 99.20 | 2.50 | 75.50 | 9.30 | 66.20 | 75.40 | 76.10 | 9.20 |
| 15 | 124.60 | 114.70 | 2.50 | 75.50 | 10.10 | 65.40 | 75.40 | 76.00 | 10.10 |
| 16 | 125.50 | 115.60 | 2.50 | 75.60 | 10.30 | 65.30 | 75.60 | 76.00 | 10.30 |
| 17 | 126.10 | 116.20 | 2.50 | 75.40 | 10.60 | 64.80 | 75.30 | 76.00 | 10.50 |
| 18 | 138.40 | 128.50 | 2.50 | 75.80 | 11.20 | 64.60 | 75.70 | 76.00 | 11.20 |
| 19 | 126.10 | 116.20 | 2.50 | 76.00 | 10.80 | 65.20 | 75.90 | 76.40 | 10.80 |
| 20 | 125.70 | 115.80 | 2.50 | 76.10 | 10.80 | 65.30 | 75.80 | 76.50 | 10.90 |
| 21 | 125.40 | 115.50 | 2.50 | 76.10 | 10.90 | 65.20 | 76.00 | 76.60 | 10.90 |
| 22 | 124.20 | 116.80 | 0.00 | 76.10 | 10.80 | 65.30 | 76.00 | 76.60 | 10.50 |
| 23 | 124.70 | 117.30 | 0.00 | 76.00 | 10.90 | 65.10 | 75.90 | 76.50 | 10.90 |
| 24 | 124.40 | 117.00 | 0.00 | 75.70 | 10.70 | 65.00 | 75.60 | 76.30 | 10.90 |
|
| AVG | 102.95 | 94.04 | 1.51 | 75.79 | 9.34 | 66.45 | 75.67 | 76.17 | 9.28 |
|
| MAX | 138.40 | 128.50 | 2.50 | 76.10 | 11.20 | 67.80 | 76.00 | 76.60 | 11.20 |
| MIN | 75.90 | 68.40 | 0.00 | 75.40 | 8.00 | 64.60 | 75.30 | 75.90 | 7.90 |
| |
Powerhouse 1 |
Powerhouse 2 |
Project |
| Hour | Generation Flow kcfs | Forebay Elevation | Forebay Elevation | Generation Flow kcfs | Spillway Gates in Use | Miscellaneous Flow kcfs* |
|---|
| 1 | 17.90 | 75.8 | 75.7 | 51.60 | 0 | 7.4 |
| 2 | 17.80 | 75.8 | 75.7 | 50.70 | 0 | 7.4 |
| 3 | 17.70 | 75.8 | 75.6 | 50.80 | 0 | 7.4 |
| 4 | 17.80 | 75.7 | 75.6 | 50.80 | 0 | 7.4 |
| 5 | 17.80 | 75.7 | 75.6 | 50.90 | 0 | 7.4 |
| 6 | 17.90 | 75.6 | 75.4 | 50.90 | 0 | 7.4 |
| 7 | 17.70 | 75.6 | 75.5 | 50.70 | 0 | 7.4 |
| 8 | 17.90 | 75.8 | 75.7 | 53.80 | 2 | 7.4 |
| 9 | 17.90 | 75.9 | 75.8 | 65.80 | 2 | 7.4 |
| 10 | 18.20 | 75.9 | 75.7 | 68.40 | 2 | 7.4 |
| 11 | 18.10 | 75.9 | 75.7 | 68.10 | 2 | 7.4 |
| 12 | 18.40 | 75.9 | 75.8 | 68.70 | 2 | 7.4 |
| 13 | 18.50 | 75.8 | 75.7 | 69.30 | 2 | 7.4 |
| 14 | 19.60 | 75.5 | 75.4 | 79.60 | 2 | 7.4 |
| 15 | 19.10 | 75.5 | 75.4 | 95.60 | 2 | 7.4 |
| 16 | 18.90 | 75.6 | 75.6 | 96.70 | 2 | 7.4 |
| 17 | 18.90 | 75.4 | 75.3 | 97.30 | 2 | 7.4 |
| 18 | 19.80 | 75.8 | 75.7 | 108.70 | 2 | 7.4 |
| 19 | 18.70 | 76.0 | 75.9 | 97.50 | 2 | 7.4 |
| 20 | 18.80 | 76.1 | 75.8 | 97.00 | 2 | 7.4 |
| 21 | 18.50 | 76.1 | 76.0 | 97.00 | 0 | 7.4 |
| 22 | 18.80 | 76.1 | 76.0 | 98.00 | 0 | 7.4 |
| 23 | 18.90 | 76.0 | 75.9 | 98.40 | 0 | 7.4 |
| 24 | 18.86 | 75.7 | 75.6 | 98.14 | 0 | 7.4 |
|
| AVG | 18.44 | 75.8 | 75.7 | 75.60 | 1 | 7.4 |
|
| MAX | 19.80 | 76.1 | 76.0 | 108.70 | 2 | 7.4 |
| MIN | 17.70 | 75.4 | 75.3 | 50.70 | 0 | 7.4 |
* 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.