Bonneville Dam
Monday September 1, 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 | 89.80 | 73.20 | 9.20 | 75.70 | 9.30 | 66.40 | 75.60 | 75.90 | 9.10 |
| 2 | 87.50 | 74.30 | 5.80 | 75.30 | 9.40 | 65.90 | 75.20 | 75.90 | 9.30 |
| 3 | 87.50 | 74.40 | 5.70 | 75.30 | 9.40 | 65.90 | 75.20 | 75.70 | 9.20 |
| 4 | 86.90 | 73.80 | 5.70 | 75.40 | 9.20 | 66.20 | 75.30 | 75.70 | 9.10 |
| 5 | 87.30 | 74.20 | 5.70 | 75.50 | 9.20 | 66.30 | 75.40 | 75.80 | 9.00 |
| 6 | 87.20 | 74.10 | 5.70 | 75.40 | 9.00 | 66.40 | 75.20 | 75.70 | 8.90 |
| 7 | 88.60 | 74.10 | 7.10 | 75.30 | 9.00 | 66.30 | 75.20 | 75.37 | 8.90 |
| 8 | 90.20 | 74.60 | 8.20 | 75.40 | 9.00 | 66.40 | 75.30 | 75.70 | 8.90 |
| 9 | 84.40 | 72.60 | 4.40 | 75.40 | 8.20 | 67.20 | 75.30 | 75.70 | 8.10 |
| 10 | 91.70 | 81.90 | 2.40 | 75.20 | 8.90 | 66.30 | 75.10 | 75.60 | 8.70 |
| 11 | 94.90 | 85.10 | 2.40 | 75.10 | 8.60 | 66.50 | 75.00 | 75.50 | 8.60 |
| 12 | 94.70 | 84.90 | 2.40 | 75.10 | 8.50 | 66.60 | 74.90 | 75.50 | 8.40 |
| 13 | 94.40 | 84.60 | 2.40 | 75.30 | 8.50 | 66.80 | 75.20 | 75.60 | 8.40 |
| 14 | 94.60 | 84.80 | 2.40 | 75.10 | 8.40 | 66.70 | 74.90 | 75.60 | 8.30 |
| 15 | 94.70 | 84.90 | 2.40 | 75.10 | 8.40 | 66.70 | 74.90 | 75.69 | 8.30 |
| 16 | 94.90 | 85.10 | 2.40 | 75.20 | 8.40 | 66.80 | 75.00 | 75.50 | 8.40 |
| 17 | 95.40 | 85.60 | 2.40 | 75.00 | 8.60 | 66.40 | 74.90 | 75.50 | 8.50 |
| 18 | 110.70 | 100.90 | 2.40 | 75.00 | 9.50 | 65.50 | 74.90 | 75.50 | 9.40 |
| 19 | 124.70 | 114.90 | 2.40 | 75.30 | 10.40 | 64.90 | 75.10 | 75.60 | 10.30 |
| 20 | 125.60 | 115.80 | 2.40 | 75.40 | 10.40 | 65.00 | 75.30 | 75.90 | 10.40 |
| 21 | 125.10 | 115.30 | 2.40 | 75.60 | 10.40 | 65.20 | 75.50 | 76.00 | 10.40 |
| 22 | 122.10 | 114.70 | 0.00 | 75.70 | 10.20 | 65.50 | 75.60 | 76.10 | 10.30 |
| 23 | 108.60 | 101.20 | 0.00 | 75.70 | 9.60 | 66.10 | 75.60 | 76.10 | 9.40 |
| 24 | 93.70 | 86.30 | 0.00 | 75.70 | 8.80 | 66.90 | 75.60 | 76.00 | 8.70 |
|
| AVG | 98.13 | 87.14 | 3.60 | 75.34 | 9.14 | 66.20 | 75.22 | 75.71 | 9.04 |
|
| MAX | 125.60 | 115.80 | 9.20 | 75.70 | 10.40 | 67.20 | 75.60 | 76.10 | 10.40 |
| MIN | 84.40 | 72.60 | 0.00 | 75.00 | 8.20 | 64.90 | 74.90 | 75.37 | 8.10 |
| |
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 | 73.20 | 1 | 7.4 |
| 2 | 0.00 | 75.3 | 75.2 | 74.30 | 1 | 7.4 |
| 3 | 0.00 | 75.3 | 75.2 | 74.40 | 1 | 7.4 |
| 4 | 0.00 | 75.4 | 75.3 | 73.80 | 1 | 7.4 |
| 5 | 0.00 | 75.5 | 75.4 | 74.20 | 1 | 7.4 |
| 6 | 0.00 | 75.4 | 75.2 | 74.10 | 1 | 7.4 |
| 7 | 0.00 | 75.3 | 75.2 | 74.10 | 3 | 7.4 |
| 8 | 7.40 | 75.4 | 75.3 | 67.20 | 3 | 7.4 |
| 9 | 17.90 | 75.4 | 75.3 | 54.70 | 2 | 7.4 |
| 10 | 18.40 | 75.2 | 75.1 | 63.50 | 2 | 7.4 |
| 11 | 18.20 | 75.1 | 75.0 | 66.90 | 2 | 7.4 |
| 12 | 18.20 | 75.1 | 74.9 | 66.70 | 2 | 7.4 |
| 13 | 18.00 | 75.3 | 75.2 | 66.60 | 2 | 7.4 |
| 14 | 17.90 | 75.1 | 74.9 | 66.90 | 2 | 7.4 |
| 15 | 18.00 | 75.1 | 74.9 | 66.90 | 2 | 7.4 |
| 16 | 18.20 | 75.2 | 75.0 | 66.90 | 2 | 7.4 |
| 17 | 18.20 | 75.0 | 74.9 | 67.40 | 2 | 7.4 |
| 18 | 18.90 | 75.0 | 74.9 | 82.00 | 2 | 7.4 |
| 19 | 19.70 | 75.3 | 75.1 | 95.20 | 2 | 7.4 |
| 20 | 19.90 | 75.4 | 75.3 | 95.90 | 2 | 7.4 |
| 21 | 19.70 | 75.6 | 75.5 | 95.60 | 0 | 7.4 |
| 22 | 19.70 | 75.7 | 75.6 | 95.00 | 0 | 7.4 |
| 23 | 18.50 | 75.7 | 75.6 | 82.70 | 0 | 7.4 |
| 24 | 18.00 | 75.7 | 75.6 | 68.30 | 0 | 7.4 |
|
| AVG | 12.70 | 75.3 | 75.2 | 74.44 | 2 | 7.4 |
|
| MAX | 19.90 | 75.7 | 75.6 | 95.90 | 3 | 7.4 |
| MIN | 0.00 | 75.0 | 74.9 | 54.70 | 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.