US Army Corps of Engineers

McNary Dam & Lake Wallula

September 2021

Day of MonthTotal Generation MWhAverage Generation MWStation Use MWhInflow kcfsTotal Outflow kcfsGeneration Flow kcfsSpill kcfsMidnight Reservoir ElevationAverage Forebay ElevationAverage Tailwater ElevationAverage Head feet
1 12711 530 96 89.10 105.60 100.90 0.00 338.28 338.62 264.65 73.97
2 13584 566 96 129.90 113.90 109.20 0.00 339.15 338.91 264.96 73.95
3 13408 559 96 109.00 111.80 107.10 0.00 338.97 339.22 265.51 73.71
4 10896 454 96 95.70 90.80 86.10 0.00 339.24 339.34 265.60 73.74
5 10201 425 96 82.30 85.50 80.80 0.00 339.07 339.23 265.63 73.60
6 8650 360 96 73.40 72.90 68.20 0.00 339.11 339.13 265.43 73.70
7 11025 459 96 90.20 92.80 88.10 0.00 338.97 339.16 265.96 73.20
8 11260 469 96 99.20 94.90 90.20 0.00 339.19 339.25 266.33 72.92
9 11289 470 96 97.30 94.90 90.20 0.00 339.32 339.42 266.36 73.06
10 7940 331 96 69.50 67.60 62.90 0.00 339.28 339.46 265.91 73.55
11 7535 314 96 63.10 64.20 59.50 0.00 339.24 339.23 265.56 73.67
12 8146 339 96 75.50 68.90 64.20 0.00 339.57 339.46 265.59 73.87
13 10323 430 96 75.90 86.90 82.20 0.00 338.99 339.24 265.96 73.28
14 9770 407 96 81.90 82.40 77.70 0.00 338.96 339.01 265.80 73.21
15 8488 354 96 72.90 72.20 67.50 0.00 338.77 338.88 265.82 73.06
16 80.60 72.90 68.20 0.00 339.20 339.03 265.80 73.23
17 85.00 86.20 81.50 0.00 339.13 339.26 265.96 73.30
18 78.10 76.70 72.00 0.00 339.22 339.24 266.06 73.18
19 70.30 69.60 64.90 0.00 339.21 339.17 266.04 73.13
20 70.70 87.40 82.70 0.00 338.28 338.86 266.07 72.79
21 80.30 79.80 75.10 0.00 338.35 338.42 265.92 72.50
22 83.40 81.60 76.90 0.00 338.46 338.49 265.87 72.62
23
24
25
26
27
28
29
30
TOT155225  1440        
AVG 10348 431 96 84.24 84.52 79.82 0.00 339.00 339.09 265.76 73.33
MAX 13584   129.90 113.90 109.20 0.00 339.57 339.46 266.36 73.97
MIN 7535   63.10 64.20 59.50 0.00 338.28 338.42 264.65 72.50