US Army Corps of Engineers

Wanapum Dam & Lake

August 2025

Day of MonthTotal Generation MWhAverage Generation MWStation Use MWhInflow kcfsTotal Outflow kcfsGeneration Flow kcfsSpill kcfsMidnight Reservoir ElevationAverage Forebay ElevationAverage Tailwater ElevationAverage Head feet
1 12122 505 19 77.60 96.60 87.70 6.90 566.55 567.84 489.43 78.41
2 9481 395 19 82.70 70.20 67.00 1.20 568.30 567.24 487.94 79.30
3 9499 396 19 76.40 70.10 66.70 1.40 569.16 568.18 488.28 79.90
4 11637 485 19 82.60 86.00 82.20 1.80 568.70 569.28 489.40 79.88
5 11930 497 19 89.40 88.70 85.10 1.60 568.80 568.58 489.26 79.32
6 13482 562 18 98.30 100.90 97.50 1.50 568.44 568.17 489.93 78.24
7 11819 492 19 107.80 87.20 83.40 1.90 571.27 569.65 489.45 80.20
8 17350 723 18 123.80 129.20 124.50 2.70 570.53 570.63 492.05 78.58
9 15207 634 19 107.00 112.80 108.80 2.00 569.73 570.09 491.17 78.92
10 13758 573 19 569.95
11 15612 650 20 113.20 116.00 112.10 1.90 569.58 569.57 490.94 78.63
12 16327 680 20 116.20 122.70 119.10 1.60 568.68 568.65 491.35 77.30
13 13949 581 21 100.90 106.60 103.20 1.40 567.89 567.99 490.35 77.64
14 12137 506 19 95.60 90.40 87.10 1.30 568.62 567.75 489.32 78.43
15 12739 531 19 94.60 94.80 91.40 1.50 568.58 568.18 489.64 78.54
16 12219 509 19 100.70 89.60 85.80 1.80 570.12 569.49 489.67 79.82
17 13458 561 18 96.00 99.50 95.60 1.80 569.64 569.47 490.17 79.30
18 11002 458 19 82.00 80.60 76.80 1.70 569.83 569.12 488.89 80.23
19 12744 531 19 96.40 94.00 90.00 2.00 570.15 570.05 489.93 80.12
20 10660 444 19 73.80 77.70 73.90 1.90 569.60 569.57 488.56 81.01
21 14713 613 19 103.30 109.30 105.80 1.50 568.77 569.52 490.61 78.91
22 13156 548 19 96.40 98.70 95.10 1.50 568.46 568.49 490.01 78.48
23 13188 550 19 104.30 98.50 94.80 1.70 569.26 569.09 490.11 78.98
24 11436 476 19 85.10 84.60 80.80 1.80 569.33 569.36 489.10 80.26
25 14790 616 20 113.40 109.10 105.10 2.00 569.93 569.94 490.75 79.19
26 15998 667 19 111.00 118.70 115.20 1.50 568.87 569.06 491.24 77.82
27 100.90 100.20 96.50 1.70 568.97 569.05 490.14 78.91
28 99.20 105.00 101.60 1.40 568.17 568.40 490.45 77.95
29 108.10 95.90 92.20 1.70 569.86 569.06 489.98 79.08
30 95.70 93.40 89.50 1.90 570.17 569.77 489.99 79.78
31 101.60 99.00 95.00 2.00 570.54 569.94 490.08 79.86
TOT340413  496        
AVG 13093 546 19 97.80 97.53 93.65 1.89 569.24 569.04 489.94 79.10
MAX 17350   123.80 129.20 124.50 6.90 571.27 570.63 492.05 81.01
MIN 9481   73.80 70.10 66.70 1.20 566.55 567.24 487.94 77.30
BUILDING STRONG®