Bonneville Dam
Thursday September 18, 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 | 89.30 | 81.90 | 0.00 | 76.00 | 9.00 | 67.00 | 75.90 | 76.20 | 9.00 |
2 | 87.80 | 80.40 | 0.00 | 76.00 | 8.90 | 67.10 | 75.80 | 76.20 | 8.80 |
3 | 86.90 | 79.50 | 0.00 | 75.80 | 8.80 | 67.00 | 75.70 | 76.10 | 8.70 |
4 | 86.60 | 79.20 | 0.00 | 75.70 | 8.90 | 66.80 | 75.60 | 76.10 | 8.80 |
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AVG | 87.65 | 80.25 | 0.00 | 75.88 | 8.90 | 66.97 | 75.75 | 76.14 | 8.82 |
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MAX | 89.30 | 81.90 | 0.00 | 76.00 | 9.00 | 67.10 | 75.90 | 76.20 | 9.00 |
MIN | 86.60 | 79.20 | 0.00 | 75.70 | 8.80 | 66.80 | 75.60 | 76.10 | 8.70 |
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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 | 76.0 | 75.9 | 81.90 | 0 | 7.4 |
2 | 0.00 | 76.0 | 75.8 | 80.40 | 0 | 7.4 |
3 | 0.00 | 75.8 | 75.7 | 79.50 | 0 | 7.4 |
4 | 0.00 | 75.7 | 75.6 | 79.20 | 0 | 7.4 |
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AVG | 0.00 | 75.9 | 75.8 | 80.25 | 0 | 7.4 |
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MAX | 0.00 | 76.0 | 75.9 | 81.90 | 0 | 7.4 |
MIN | 0.00 | 75.7 | 75.6 | 79.20 | 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.