Bonneville Dam
Friday August 29, 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 | 116.30 | 54.60 | 49.30 | 75.20 | 11.70 | 63.50 | 75.00 | 75.60 | 11.70 |
| 2 | 116.40 | 54.70 | 49.30 | 75.20 | 11.50 | 63.70 | 75.00 | 75.60 | 11.60 |
| 3 | 116.30 | 54.50 | 49.40 | 75.20 | 11.40 | 63.80 | 75.00 | 75.60 | 11.50 |
| 4 | 116.40 | 54.60 | 49.40 | 75.20 | 11.30 | 63.90 | 75.00 | 75.60 | 11.40 |
| 5 | 116.40 | 54.70 | 49.30 | 75.10 | 11.20 | 63.90 | 74.90 | 75.50 | 11.20 |
| 6 | 116.60 | 54.90 | 49.30 | 75.00 | 11.10 | 63.90 | 74.80 | 75.50 | 11.10 |
| 7 | 117.60 | 55.90 | 49.30 | 75.00 | 11.10 | 63.90 | 74.60 | 75.50 | 11.10 |
| 8 | 117.70 | 56.00 | 49.30 | 75.00 | 11.00 | 64.00 | 74.80 | 75.40 | 11.00 |
| 9 | 117.90 | 56.20 | 49.30 | 75.00 | 11.00 | 64.00 | 74.80 | 75.40 | 11.00 |
| 10 | 117.70 | 56.10 | 49.20 | 75.00 | 10.90 | 64.10 | 74.80 | 75.40 | 10.80 |
| 11 | 117.70 | 56.10 | 49.20 | 75.00 | 10.80 | 64.20 | 74.80 | 75.40 | 10.80 |
| 12 | 117.80 | 56.20 | 49.20 | 75.00 | 10.90 | 64.10 | 74.90 | 75.40 | 10.90 |
| 13 | 117.80 | 56.20 | 49.20 | 74.80 | 11.00 | 63.80 | 74.70 | 75.30 | 11.00 |
| 14 | 123.70 | 62.20 | 49.10 | 74.80 | 11.20 | 63.60 | 74.70 | 75.30 | 11.20 |
| 15 | 124.50 | 63.00 | 49.10 | 74.60 | 11.40 | 63.20 | 74.40 | 75.30 | 11.40 |
| 16 | 138.20 | 76.80 | 49.00 | 74.70 | 12.00 | 62.70 | 74.60 | 75.20 | 12.00 |
| 17 | 139.00 | 77.50 | 49.10 | 74.80 | 12.00 | 62.80 | 74.70 | 75.40 | 12.00 |
| 18 | 139.00 | 77.50 | 49.10 | 74.90 | 12.00 | 62.90 | 74.80 | 75.50 | 12.00 |
| 19 | 138.60 | 76.90 | 49.30 | 75.00 | 11.90 | 63.10 | 74.90 | 75.50 | 12.00 |
| 20 | 138.40 | 76.70 | 49.30 | 75.10 | 11.90 | 63.20 | 74.90 | 75.60 | 11.90 |
| 21 | 139.00 | 77.30 | 49.30 | 75.20 | 12.00 | 63.20 | 75.00 | 75.70 | 11.90 |
| 22 | 137.80 | 76.00 | 49.40 | 75.40 | 12.00 | 63.40 | 75.40 | 75.80 | 12.00 |
| 23 | 119.30 | 57.30 | 49.60 | 75.70 | 11.20 | 64.50 | 75.60 | 76.00 | 11.20 |
| 24 | 105.70 | 43.60 | 49.70 | 75.80 | 10.70 | 65.10 | 75.60 | 76.10 | 10.70 |
|
| AVG | 123.58 | 61.90 | 49.28 | 75.07 | 11.38 | 63.69 | 74.90 | 75.52 | 11.39 |
|
| MAX | 139.00 | 77.50 | 49.70 | 75.80 | 12.00 | 65.10 | 75.60 | 76.10 | 12.00 |
| MIN | 105.70 | 43.60 | 49.00 | 74.60 | 10.70 | 62.70 | 74.40 | 75.20 | 10.70 |
| |
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 | 75.2 | 75.0 | 54.60 | 11 | 12.4 |
| 2 | 0.00 | 75.2 | 75.0 | 54.70 | 11 | 12.4 |
| 3 | 0.00 | 75.2 | 75.0 | 54.50 | 11 | 12.4 |
| 4 | 0.00 | 75.2 | 75.0 | 54.60 | 11 | 12.4 |
| 5 | 0.00 | 75.1 | 74.9 | 54.70 | 11 | 12.4 |
| 6 | 0.00 | 75.0 | 74.8 | 54.90 | 11 | 12.4 |
| 7 | 0.00 | 75.0 | 74.6 | 55.90 | 11 | 12.4 |
| 8 | 0.00 | 75.0 | 74.8 | 56.00 | 11 | 12.4 |
| 9 | 0.00 | 75.0 | 74.8 | 56.20 | 11 | 12.4 |
| 10 | 0.00 | 75.0 | 74.8 | 56.10 | 11 | 12.4 |
| 11 | 0.00 | 75.0 | 74.8 | 56.10 | 11 | 12.4 |
| 12 | 0.00 | 75.0 | 74.9 | 56.20 | 11 | 12.4 |
| 13 | 0.00 | 74.8 | 74.7 | 56.20 | 11 | 12.4 |
| 14 | 0.00 | 74.8 | 74.7 | 62.20 | 11 | 12.4 |
| 15 | 0.00 | 74.6 | 74.4 | 63.00 | 11 | 12.4 |
| 16 | 0.00 | 74.7 | 74.6 | 76.80 | 11 | 12.4 |
| 17 | 0.00 | 74.8 | 74.7 | 77.50 | 11 | 12.4 |
| 18 | 0.00 | 74.9 | 74.8 | 77.50 | 11 | 12.4 |
| 19 | 0.00 | 75.0 | 74.9 | 76.90 | 11 | 12.4 |
| 20 | 0.00 | 75.1 | 74.9 | 76.70 | 11 | 12.4 |
| 21 | 0.00 | 75.2 | 75.0 | 77.30 | 11 | 12.4 |
| 22 | 0.00 | 75.4 | 75.4 | 76.00 | 11 | 12.4 |
| 23 | 0.00 | 75.7 | 75.6 | 57.30 | 11 | 12.4 |
| 24 | 0.00 | 75.8 | 75.6 | 43.60 | 11 | 12.4 |
|
| AVG | 0.00 | 75.1 | 74.9 | 61.90 | 11 | 12.4 |
|
| MAX | 0.00 | 75.8 | 75.6 | 77.50 | 11 | 12.4 |
| MIN | 0.00 | 74.6 | 74.4 | 43.60 | 11 | 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.