Bonneville Dam
Monday September 1, 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 | 89.80 | 73.20 | 9.20 | 75.70 | 9.30 | 66.40 | 75.60 | 75.90 | 9.10 |
2 | 87.50 | 74.30 | 5.80 | 75.30 | 9.40 | 65.90 | 75.20 | 75.90 | 9.30 |
3 | 87.50 | 74.40 | 5.70 | 75.30 | 9.40 | 65.90 | 75.20 | 75.70 | 9.20 |
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AVG | 88.27 | 73.97 | 6.90 | 75.43 | 9.37 | 66.07 | 75.33 | 75.80 | 9.20 |
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MAX | 89.80 | 74.40 | 9.20 | 75.70 | 9.40 | 66.40 | 75.60 | 75.90 | 9.30 |
MIN | 87.50 | 73.20 | 5.70 | 75.30 | 9.30 | 65.90 | 75.20 | 75.70 | 9.10 |
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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 | 75.7 | 75.6 | 73.20 | 1 | 7.4 |
2 | 0.00 | 75.3 | 75.2 | 74.30 | 1 | 7.4 |
3 | 0.00 | 75.3 | 75.2 | 74.40 | 1 | 7.4 |
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AVG | 0.00 | 75.4 | 75.3 | 73.97 | 1 | 7.4 |
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MAX | 0.00 | 75.7 | 75.6 | 74.40 | 1 | 7.4 |
MIN | 0.00 | 75.3 | 75.2 | 73.20 | 1 | 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.