Bonneville Dam
Wednesday March 11, 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 | 193.10 | 186.10 | 0.00 | 75.00 | 16.60 | 58.40 | 75.00 | 76.00 | 16.50 |
| 2 | 192.40 | 185.40 | 0.00 | 75.00 | 16.50 | 58.50 | 75.00 | 76.00 | 16.40 |
| 3 | 192.20 | 185.20 | 0.00 | 75.10 | 16.50 | 58.60 | 75.10 | 76.00 | 16.40 |
| 4 | 193.90 | 186.90 | 0.00 | 75.00 | 16.60 | 58.40 | 75.00 | 76.00 | 16.50 |
| 5 | 193.30 | 186.30 | 0.00 | 75.10 | 16.60 | 58.50 | 75.10 | 76.00 | 16.50 |
| 6 | 193.50 | 186.50 | 0.00 | 75.00 | 16.50 | 58.50 | 75.00 | 76.00 | 16.50 |
| 7 | 200.30 | 188.20 | 0.10 | 74.90 | 16.90 | 58.00 | 74.90 | 76.00 | 16.80 |
| 8 | 202.20 | 187.80 | 2.40 | 75.00 | 16.90 | 58.10 | 75.00 | 76.10 | 16.80 |
| 9 | 202.00 | 187.60 | 2.40 | 75.00 | 17.00 | 58.00 | 75.00 | 76.10 | 16.80 |
| 10 | 201.80 | 187.40 | 2.40 | 75.00 | 17.00 | 58.00 | 75.00 | 76.10 | 16.80 |
| 11 | 203.00 | 188.60 | 2.40 | 75.00 | 17.10 | 57.90 | 75.00 | 76.10 | 16.90 |
| 12 | 203.10 | 188.70 | 2.40 | 74.90 | 17.20 | 57.70 | 74.90 | 76.10 | 17.00 |
| 13 | 203.60 | 189.20 | 2.40 | 75.00 | 17.20 | 57.80 | 75.00 | 76.10 | 17.10 |
| 14 | 203.30 | 188.90 | 2.40 | 75.00 | 17.30 | 57.70 | 75.00 | 76.10 | 17.20 |
| 15 | 203.60 | 189.20 | 2.40 | 75.00 | 17.30 | 57.70 | 75.10 | 76.00 | 17.20 |
| 16 | 194.90 | 180.50 | 2.40 | 74.90 | 17.50 | 57.40 | 75.00 | 76.10 | 17.30 |
| 17 | 206.70 | 192.30 | 2.40 | 74.70 | 17.70 | 57.00 | 74.60 | 76.00 | 17.60 |
| 18 | 221.30 | 194.40 | 14.90 | 74.30 | 18.50 | 55.80 | 74.40 | 75.90 | 18.40 |
| 19 | 221.70 | 194.70 | 15.00 | 74.30 | 18.70 | 55.60 | 74.40 | 75.80 | 18.40 |
| 20 | 222.60 | 195.60 | 15.00 | 74.10 | 18.70 | 55.40 | 74.20 | 75.70 | 18.50 |
| 21 | 223.80 | 196.90 | 14.90 | 74.10 | 18.80 | 55.30 | 74.20 | 75.70 | 18.60 |
| 22 | 224.20 | 197.30 | 14.90 | 74.10 | 19.20 | 54.90 | 74.10 | 75.60 | 18.70 |
| 23 | 224.00 | 197.10 | 14.90 | 74.00 | 19.30 | 54.70 | 74.00 | 75.60 | 18.70 |
| 24 | 224.80 | 197.90 | 14.90 | 73.80 | 19.10 | 54.70 | 73.90 | 75.60 | 18.80 |
|
| AVG | 206.05 | 189.95 | 5.36 | 74.72 | 17.53 | 57.19 | 74.75 | 75.95 | 17.35 |
|
| MAX | 224.80 | 197.90 | 15.00 | 75.10 | 19.30 | 58.60 | 75.10 | 76.10 | 18.80 |
| MIN | 192.20 | 180.50 | 0.00 | 73.80 | 16.50 | 54.70 | 73.90 | 75.60 | 16.40 |
| |
Powerhouse 1 |
Powerhouse 2 |
Project |
| Hour | Generation Flow kcfs | Forebay Elevation | Forebay Elevation | Generation Flow kcfs | Spillway Gates in Use | Miscellaneous Flow kcfs* |
|---|
| 1 | 77.80 | 75.0 | 75.0 | 108.30 | 0 | 7.0 |
| 2 | 77.20 | 75.0 | 75.0 | 108.20 | 0 | 7.0 |
| 3 | 76.60 | 75.1 | 75.1 | 108.60 | 0 | 7.0 |
| 4 | 78.00 | 75.0 | 75.0 | 108.90 | 0 | 7.0 |
| 5 | 78.00 | 75.1 | 75.1 | 108.30 | 0 | 7.0 |
| 6 | 78.20 | 75.0 | 75.0 | 108.30 | 0 | 7.0 |
| 7 | 79.10 | 74.9 | 74.9 | 109.10 | 0 | 12.0 |
| 8 | 78.90 | 75.0 | 75.0 | 108.90 | 2 | 12.0 |
| 9 | 79.00 | 75.0 | 75.0 | 108.60 | 2 | 12.0 |
| 10 | 78.20 | 75.0 | 75.0 | 109.20 | 2 | 12.0 |
| 11 | 79.30 | 75.0 | 75.0 | 109.30 | 2 | 12.0 |
| 12 | 79.50 | 74.9 | 74.9 | 109.20 | 2 | 12.0 |
| 13 | 79.70 | 75.0 | 75.0 | 109.50 | 2 | 12.0 |
| 14 | 79.20 | 75.0 | 75.0 | 109.70 | 2 | 12.0 |
| 15 | 79.00 | 75.0 | 75.1 | 110.20 | 2 | 12.0 |
| 16 | 73.90 | 74.9 | 75.0 | 106.60 | 2 | 12.0 |
| 17 | 81.20 | 74.7 | 74.6 | 111.10 | 2 | 12.0 |
| 18 | 81.20 | 74.3 | 74.4 | 113.20 | 12 | 12.0 |
| 19 | 80.90 | 74.3 | 74.4 | 113.80 | 12 | 12.0 |
| 20 | 81.40 | 74.1 | 74.2 | 114.20 | 12 | 12.0 |
| 21 | 81.80 | 74.1 | 74.2 | 115.10 | 12 | 12.0 |
| 22 | 81.70 | 74.1 | 74.1 | 115.60 | 12 | 12.0 |
| 23 | 81.90 | 74.0 | 74.0 | 115.20 | 12 | 12.0 |
| 24 | 82.10 | 73.8 | 73.9 | 115.80 | 12 | 12.0 |
|
| AVG | 79.33 | 74.7 | 74.7 | 110.62 | 4 | 10.7 |
|
| MAX | 82.10 | 75.1 | 75.1 | 115.80 | 12 | 12.0 |
| MIN | 73.90 | 73.8 | 73.9 | 106.60 | 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.