Bonneville Dam
Tuesday May 12, 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 | 223.80 | 60.90 | 150.50 | 75.00 | 19.00 | 56.00 | 74.90 | 76.10 | 19.00 |
| 2 | 219.70 | 56.60 | 150.70 | 75.10 | 18.70 | 56.40 | 74.90 | 76.10 | 18.80 |
| 3 | 210.50 | 47.40 | 150.70 | 75.10 | 18.30 | 56.80 | 75.00 | 76.10 | 18.50 |
| 4 | 209.90 | 46.70 | 150.80 | 75.20 | 18.20 | 57.00 | 75.00 | 76.20 | 18.30 |
| 5 | 219.30 | 56.20 | 150.70 | 75.00 | 18.60 | 56.40 | 74.90 | 76.20 | 18.60 |
| 6 | 233.90 | 71.20 | 150.30 | 74.90 | 18.90 | 56.00 | 74.70 | 76.10 | 19.00 |
| 7 | 232.30 | 69.50 | 150.40 | 75.00 | 19.00 | 56.00 | 74.70 | 76.10 | 19.00 |
| 8 | 220.00 | 56.80 | 150.80 | 75.30 | 18.50 | 56.80 | 75.10 | 76.30 | 18.60 |
| 9 | 218.30 | 55.00 | 150.90 | 75.30 | 18.40 | 56.90 | 75.10 | 76.30 | 18.50 |
| 10 | 218.10 | 54.90 | 150.80 | 75.20 | 18.40 | 56.80 | 75.00 | 76.20 | 18.40 |
| 11 | 218.20 | 55.10 | 150.70 | 75.20 | 18.30 | 56.90 | 75.00 | 76.20 | 18.40 |
| 12 | 218.30 | 55.20 | 150.70 | 75.20 | 18.30 | 56.90 | 75.00 | 76.20 | 18.40 |
| 13 | 218.50 | 55.40 | 150.70 | 75.10 | 18.30 | 56.80 | 75.00 | 76.20 | 18.30 |
| 14 | 218.20 | 55.20 | 150.60 | 75.10 | 18.30 | 56.80 | 75.00 | 76.20 | 18.40 |
| 15 | 219.30 | 56.30 | 150.60 | 74.90 | 18.40 | 56.50 | 74.60 | 76.20 | 18.50 |
| 16 | 233.70 | 71.10 | 150.20 | 74.80 | 18.90 | 55.90 | 74.70 | 76.10 | 19.00 |
| 17 | 234.40 | 71.80 | 150.20 | 74.80 | 19.00 | 55.80 | 74.80 | 76.10 | 19.00 |
| 18 | 235.70 | 72.90 | 150.40 | 75.00 | 19.10 | 55.90 | 74.90 | 76.30 | 19.10 |
| 19 | 235.70 | 72.80 | 150.50 | 75.00 | 19.10 | 55.90 | 74.90 | 76.30 | 19.10 |
| 20 | 235.20 | 72.20 | 150.60 | 75.10 | 19.20 | 55.90 | 74.90 | 76.40 | 19.30 |
| 21 | | | | | | | | | |
| 22 | | | | | | | | | |
| 23 | | | | | | | | | |
| 24 | | | | | | | | | |
|
| AVG | 223.65 | 60.66 | 150.59 | 75.06 | 18.65 | 56.42 | 74.91 | 76.19 | 18.71 |
|
| MAX | 235.70 | 72.90 | 150.90 | 75.30 | 19.20 | 57.00 | 75.10 | 76.40 | 19.30 |
| MIN | 209.90 | 46.70 | 150.20 | 74.80 | 18.20 | 55.80 | 74.60 | 76.10 | 18.30 |
| |
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 | 75.0 | 74.9 | 60.90 | 18 | 12.4 |
| 2 | 0.00 | 75.1 | 74.9 | 56.60 | 18 | 12.4 |
| 3 | 0.00 | 75.1 | 75.0 | 47.40 | 18 | 12.4 |
| 4 | 0.00 | 75.2 | 75.0 | 46.70 | 18 | 12.4 |
| 5 | 0.00 | 75.0 | 74.9 | 56.20 | 18 | 12.4 |
| 6 | 0.00 | 74.9 | 74.7 | 71.20 | 18 | 12.4 |
| 7 | 0.00 | 75.0 | 74.7 | 69.50 | 18 | 12.4 |
| 8 | 0.00 | 75.3 | 75.1 | 56.80 | 18 | 12.4 |
| 9 | 0.00 | 75.3 | 75.1 | 55.00 | 18 | 12.4 |
| 10 | 0.00 | 75.2 | 75.0 | 54.90 | 18 | 12.4 |
| 11 | 0.00 | 75.2 | 75.0 | 55.10 | 18 | 12.4 |
| 12 | 0.00 | 75.2 | 75.0 | 55.20 | 18 | 12.4 |
| 13 | 0.00 | 75.1 | 75.0 | 55.40 | 18 | 12.4 |
| 14 | 0.00 | 75.1 | 75.0 | 55.20 | 18 | 12.4 |
| 15 | 0.00 | 74.9 | 74.6 | 56.30 | 18 | 12.4 |
| 16 | 0.00 | 74.8 | 74.7 | 71.10 | 18 | 12.4 |
| 17 | 0.00 | 74.8 | 74.8 | 71.80 | 18 | 12.4 |
| 18 | 0.00 | 75.0 | 74.9 | 72.90 | 18 | 12.4 |
| 19 | 0.00 | 75.0 | 74.9 | 72.80 | 18 | 12.4 |
| 20 | 0.00 | 75.1 | 74.9 | 72.20 | 18 | 12.4 |
| 21 | | | | | | |
| 22 | | | | | | |
| 23 | | | | | | |
| 24 | | | | | | |
|
| AVG | 0.00 | 75.1 | 74.9 | 60.66 | 18 | 12.4 |
|
| MAX | 0.00 | 75.3 | 75.1 | 72.90 | 18 | 12.4 |
| MIN | 0.00 | 74.8 | 74.6 | 46.70 | 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.