Bonneville Dam
Friday October 31, 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 | 99.20 | 91.80 | 0.00 | 75.50 | 9.20 | 66.30 | 75.40 | 75.80 | 9.10 |
| 2 | 99.30 | 91.90 | 0.00 | 75.40 | 9.20 | 66.20 | 75.20 | 75.80 | 9.10 |
| 3 | 99.40 | 92.00 | 0.00 | 75.20 | 9.20 | 66.00 | 75.00 | 75.60 | 9.20 |
| 4 | 100.10 | 92.70 | 0.00 | 75.20 | 9.30 | 65.90 | 75.10 | 75.50 | 9.20 |
| 5 | 100.00 | 92.60 | 0.00 | 75.10 | 9.40 | 65.70 | 75.00 | 75.40 | 9.20 |
| 6 | 101.20 | 93.80 | 0.00 | 74.60 | 9.90 | 64.70 | 74.50 | 75.30 | 9.70 |
| 7 | 122.20 | 114.80 | 0.00 | 74.60 | 10.50 | 64.10 | 74.40 | 75.20 | 10.50 |
| 8 | 130.80 | 122.20 | 1.20 | 74.90 | 10.90 | 64.00 | 74.70 | 75.30 | 10.90 |
| 9 | 131.80 | 122.00 | 2.40 | 75.00 | 10.90 | 64.10 | 74.90 | 75.40 | 10.90 |
| 10 | 131.90 | 122.10 | 2.40 | 75.20 | 10.60 | 64.60 | 74.80 | 75.40 | 10.80 |
| 11 | 120.00 | 110.20 | 2.40 | 75.30 | 10.30 | 65.00 | 75.00 | 75.50 | 10.20 |
| 12 | 99.90 | 90.10 | 2.40 | 75.50 | 9.10 | 66.40 | 75.40 | 75.70 | 8.90 |
| 13 | 97.50 | 87.70 | 2.40 | 75.30 | 9.00 | 66.30 | 75.10 | 75.70 | 8.80 |
| 14 | 97.40 | 87.60 | 2.40 | 75.30 | 8.90 | 66.40 | 75.00 | 75.60 | 8.70 |
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| AVG | 109.34 | 100.82 | 1.11 | 75.15 | 9.74 | 65.41 | 74.96 | 75.51 | 9.66 |
|
| MAX | 131.90 | 122.20 | 2.40 | 75.50 | 10.90 | 66.40 | 75.40 | 75.80 | 10.90 |
| MIN | 97.40 | 87.60 | 0.00 | 74.60 | 8.90 | 64.00 | 74.40 | 75.20 | 8.70 |
| |
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 | 75.5 | 75.4 | 91.80 | 0 | 7.4 |
| 2 | 0.00 | 75.4 | 75.2 | 91.90 | 0 | 7.4 |
| 3 | 0.00 | 75.2 | 75.0 | 92.00 | 0 | 7.4 |
| 4 | 0.00 | 75.2 | 75.1 | 92.70 | 0 | 7.4 |
| 5 | 0.00 | 75.1 | 75.0 | 92.60 | 0 | 7.4 |
| 6 | 0.00 | 74.6 | 74.5 | 93.80 | 0 | 7.4 |
| 7 | 5.00 | 74.6 | 74.4 | 109.80 | 0 | 7.4 |
| 8 | 15.90 | 74.9 | 74.7 | 106.30 | 2 | 7.4 |
| 9 | 18.20 | 75.0 | 74.9 | 103.80 | 2 | 7.4 |
| 10 | 18.20 | 75.2 | 74.8 | 103.90 | 2 | 7.4 |
| 11 | 9.40 | 75.3 | 75.0 | 100.80 | 2 | 7.4 |
| 12 | 0.00 | 75.5 | 75.4 | 90.10 | 2 | 7.4 |
| 13 | 0.00 | 75.3 | 75.1 | 87.70 | 2 | 7.4 |
| 14 | 0.00 | 75.3 | 75.0 | 87.60 | 2 | 7.4 |
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| AVG | 4.76 | 75.1 | 75.0 | 96.06 | 1 | 7.4 |
|
| MAX | 18.20 | 75.5 | 75.4 | 109.80 | 2 | 7.4 |
| MIN | 0.00 | 74.6 | 74.4 | 87.60 | 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.