US Army Corps of Engineers

McNary Dam & Lake Wallula

February 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 19030 793 24 160.30 153.60 150.80 0.00 339.49 339.30 266.26 73.04
2 19038 793 24 151.30 152.60 149.80 0.00 339.36 339.39 265.97 73.42
3 18984 791 24 149.10 151.50 148.70 0.00 339.15 339.42 265.78 73.64
4 19058 794 24 167.10 158.90 149.10 7.00 339.79 339.55 265.77 73.78
5 19071 795 24 167.30 168.00 150.00 15.30 339.61 339.56 266.12 73.44
6 19071 795 24 155.70 163.10 150.00 10.30 339.20 339.54 266.10 73.44
7 19064 794 24 147.10 153.40 150.60 0.00 338.94 339.10 265.94 73.16
8 19047 794 24 139.80 154.20 151.40 0.00 338.04 338.70 265.89 72.81
9 18530 772 24 137.90 152.80 150.00 0.00 337.39 337.61 266.05 71.56
10 17667 736 24 174.10 144.90 142.10 0.00 338.93 338.00 265.78 72.22
11 18005 750 24 166.90 154.90 141.10 11.00 339.50 339.47 265.83 73.64
12 19063 794 24 176.50 181.10 152.10 26.30 339.28 339.40 266.80 72.60
13 19070 795 24 161.80 158.60 151.70 4.10 339.53 339.51 266.73 72.78
14 19074 795 24 157.10 153.80 151.00 0.00 339.58 339.63 266.58 73.05
15 159.60 164.20 151.80 9.60 339.35 339.63 266.84 72.79
16 161.10 158.90 151.30 4.80 339.56 339.53 266.59 72.94
17 181.50 181.20 151.40 27.10 339.66 339.63 266.75 72.88
18 169.30 170.60 152.70 15.10 339.54 339.34 266.97 72.37
19 177.90 173.60 150.70 20.10 339.73 339.61 266.70 72.91
20 167.10 172.80 150.90 19.10 339.50 339.57 266.80 72.77
21 156.80 152.70 149.90 0.00 339.57 339.51 266.25 73.26
22
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24
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26
27
28
TOT263772  336        
AVG 18841 785 24 161.20 160.73 149.86 8.09 339.27 339.29 266.31 72.98
MAX 19074   181.50 181.20 152.70 27.10 339.79 339.63 266.97 73.78
MIN 17667   137.90 144.90 141.10 0.00 337.39 337.61 265.77 71.56
BUILDING STRONG®