US Army Corps of Engineers

McNary Dam & Lake Wallula

May 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 7102 296 120 205.60 211.70 56.90 150.10 337.74 338.03 267.01 71.02
2 7074 295 120 222.30 217.30 56.90 155.70 338.05 337.92 267.18 70.74
3 7176 299 120 201.10 202.20 57.60 139.90 337.91 337.93 267.04 70.89
4 7105 296 120 198.90 196.90 56.60 135.60 338.07 338.25 266.81 71.44
5 7025 293 120 218.20 218.00 56.00 157.30 338.10 338.32 266.94 71.38
6 7025 293 120 226.10 226.90 56.50 165.70 338.03 337.93 267.12 70.81
7 7031 293 120 209.80 209.20 56.10 148.40 338.06 338.11 266.77 71.34
8 7110 296 120 213.10 218.30 56.90 156.70 337.79 338.04 266.90 71.14
9 7092 296 120 235.50 239.00 57.40 176.80 337.62 337.62 267.31 70.31
10 7099 296 120 247.20 230.40 57.20 168.40 338.46 338.01 267.37 70.64
11 7063 294 120 247.70 237.80 56.20 176.90 338.98 338.87 267.41 71.46
12 7078 295 120 245.10 267.90 57.20 206.00 337.79 338.55 268.12 70.43
13 245.20 247.20 58.00 184.50 337.67 337.79 267.99 69.80
14 224.80 220.10 56.80 158.60 337.92 337.80 267.70 70.10
15 204.80 198.10 56.20 137.20 338.24 338.09 267.21 70.88
16 211.30 203.50 56.50 142.30 338.71 338.49 267.15 71.34
17 213.70 211.60 55.80 151.20 338.81 338.85 267.17 71.68
18 176.60 188.60 55.80 128.10 338.14 338.56 266.89 71.67
19 166.50 166.60 56.20 105.70 338.13 337.90 266.33 71.57
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TOT 84981  1440        
AVG 7082 295 120 216.50 216.38 56.67 155.01 338.12 338.16 267.18 70.98
MAX 7176   247.70 267.90 58.00 206.00 338.98 338.87 268.12 71.68
MIN 7025   166.50 166.60 55.80 105.70 337.62 337.62 266.33 69.80
BUILDING STRONG®