US Army Corps of Engineers

Priest Rapids Dam & Reservoir

May 2026

Day of MonthTotal Generation MWhAverage Generation MWStation Use MWhInflow kcfsTotal Outflow kcfsGeneration Flow kcfsSpill kcfsMidnight Reservoir ElevationAverage Forebay ElevationAverage Tailwater ElevationAverage Head feet
1 16781 699 46 168.20 165.00 132.00 32.00 487.11 485.77 414.29 71.48
2 16144 673 46 173.90 175.60 125.70 48.80 486.65 486.76 415.07 71.69
3 15762 657 46 160.00 160.00 120.90 38.10 486.65 486.61 414.07 72.54
4 16565 690 47 170.40 174.60 131.80 41.70 485.49 485.79 415.14 70.65
5 16580 691 48 167.60 159.30 128.10 30.20 487.73 486.35 414.38 71.97
6 17077 712 48 158.40 165.50 132.10 32.40 485.82 486.95 414.54 72.41
7 15205 634 47 142.90 141.40 115.00 25.50 486.24 486.04 412.11 73.93
8 13117 547 46 121.50 122.40 98.50 23.00 486.02 485.06 410.34 74.72
9 15112 630 46 158.00 155.50 116.60 37.90 486.72 485.88 412.60 73.28
10 14563 607 45 154.70 161.50 114.00 46.50 484.84 485.27 413.07 72.20
11 16147 673 46 155.30 150.70 127.70 22.00 486.13 484.57 412.59 71.98
12 16820 701 39 157.30 157.80 131.80 24.60 486.00 485.69 413.04 72.65
13 12168 507 37 136.30 138.00 91.70 45.10 485.51 485.86 411.16 74.70
14 15876 662 45 155.30 153.80 122.50 30.40 485.95 485.98 412.68 73.30
15 15696 654 45 154.80 154.70 119.90 33.80 485.99 486.47 412.66 73.81
16 13764 574 44 143.20 150.30 107.10 42.30 483.97 484.94 412.23 72.71
17 13056 544 45 156.40 148.10 99.30 48.00 486.31 486.10 411.90 74.20
18 15829 660 46 147.30 147.10 122.60 23.50 486.37 485.27 412.31 72.96
19 16412 684 47 152.70 153.10 126.30 25.80 486.27 486.12 412.73 73.39
20 16615 692 49 155.10 155.20 128.10 26.10 486.24 486.22 412.85 73.37
21 16640 693 49 153.80 155.60 128.80 25.90 485.74 486.10 412.94 73.16
22 15539 647 48 145.80 144.50 118.70 24.90 486.10 485.82 412.08 73.74
23 13988 583 47 134.20 130.90 104.60 25.50 486.98 486.01 410.95 75.06
24 13420 559 47 130.20 133.10 100.30 31.90 486.21 486.51 410.95 75.56
25 14587 608 49 130.70 135.30 110.20 24.30 484.93 485.54 411.37 74.17
26 15409 642 47 145.00 143.20 119.40 22.90 485.43 485.04 412.03 73.01
27 15460 644 48 142.90 143.80 118.90 23.90 485.21 485.42 412.07 73.35
28 14179 591 50 132.70 132.00 109.00 22.10 485.41 484.76 411.13 73.63
29 148.40 144.70 101.00 42.80 486.46 486.01 411.70 74.31
30 122.00 122.80 86.80 35.30 486.23 486.85 410.05 76.80
31 142.80 138.80 103.00 34.90 487.32 486.95 411.25 75.70
TOT428511  1293        
AVG 15304 638 46 148.96 148.85 115.88 32.00 486.07 485.89 412.46 73.43
MAX 17077   173.90 175.60 132.10 48.80 487.73 486.95 415.14 76.80
MIN 12168   121.50 122.40 86.80 22.00 483.97 484.57 410.05 70.65
BUILDING STRONG®