Bonneville Dam
Tuesday August 25, 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 | 117.90 | 30.90 | 74.60 | 75.40 | 10.60 | 64.80 | 75.30 | 75.80 | 10.60 |
| 2 | 117.80 | 30.90 | 74.50 | 75.30 | 10.70 | 64.60 | 75.20 | 75.70 | 10.60 |
| 3 | 117.90 | 31.00 | 74.50 | 75.30 | 10.70 | 64.60 | 75.20 | 75.70 | 10.60 |
| 4 | 117.80 | 30.90 | 74.50 | 75.20 | 10.70 | 64.50 | 75.10 | 75.70 | 10.60 |
| 5 | 117.90 | 31.00 | 74.50 | 75.20 | 10.90 | 64.30 | 75.10 | 75.60 | 10.80 |
| 6 | 118.00 | 31.20 | 74.40 | 75.10 | 11.20 | 63.90 | 74.90 | 75.60 | 11.10 |
| 7 | 114.60 | 32.00 | 70.20 | 75.10 | 11.10 | 64.00 | 75.00 | 75.60 | 11.30 |
| 8 | 114.50 | 32.10 | 70.00 | 75.20 | 11.20 | 64.00 | 75.00 | 75.50 | 11.20 |
| 9 | 114.50 | 32.20 | 69.90 | 75.10 | 11.20 | 63.90 | 75.00 | 75.50 | 11.10 |
| 10 | 114.60 | 32.40 | 69.80 | 75.10 | 11.10 | 64.00 | 74.90 | 75.50 | 11.10 |
| 11 | 113.60 | 31.50 | 69.70 | 74.90 | 11.10 | 63.80 | 74.80 | 75.50 | 11.00 |
| 12 | 113.20 | 31.20 | 69.60 | 74.70 | 11.00 | 63.70 | 74.60 | 75.50 | 11.00 |
| 13 | 113.50 | 31.50 | 69.60 | 74.90 | 11.10 | 63.80 | 74.80 | 75.40 | 10.90 |
| 14 | | | | | | | | 75.40 | |
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| AVG | 115.83 | 31.45 | 71.98 | 75.12 | 10.97 | 64.15 | 74.99 | 75.57 | 10.92 |
|
| MAX | 118.00 | 32.40 | 74.60 | 75.40 | 11.20 | 64.80 | 75.30 | 75.80 | 11.30 |
| MIN | 113.20 | 30.90 | 69.60 | 74.70 | 10.60 | 63.70 | 74.60 | 75.40 | 10.60 |
| |
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 | 75.4 | 75.3 | 30.90 | 16 | 12.4 |
| 2 | 0.00 | 75.3 | 75.2 | 30.90 | 16 | 12.4 |
| 3 | 0.00 | 75.3 | 75.2 | 31.00 | 16 | 12.4 |
| 4 | 0.00 | 75.2 | 75.1 | 30.90 | 16 | 12.4 |
| 5 | 0.00 | 75.2 | 75.1 | 31.00 | 16 | 12.4 |
| 6 | 0.00 | 75.1 | 74.9 | 31.20 | 16 | 12.4 |
| 7 | 0.00 | 75.1 | 75.0 | 32.00 | 15 | 12.4 |
| 8 | 0.00 | 75.2 | 75.0 | 32.10 | 15 | 12.4 |
| 9 | 0.00 | 75.1 | 75.0 | 32.20 | 15 | 12.4 |
| 10 | 0.00 | 75.1 | 74.9 | 32.40 | 15 | 12.4 |
| 11 | 0.00 | 74.9 | 74.8 | 31.50 | 15 | 12.4 |
| 12 | 0.00 | 74.7 | 74.6 | 31.20 | 15 | 12.4 |
| 13 | 0.00 | 74.9 | 74.8 | 31.50 | 15 | 12.4 |
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| AVG | 0.00 | 75.1 | 75.0 | 31.45 | 15 | 12.4 |
|
| MAX | 0.00 | 75.4 | 75.3 | 32.40 | 16 | 12.4 |
| MIN | 0.00 | 74.7 | 74.6 | 30.90 | 15 | 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.