US Army Corps of Engineers

McNary Dam & Lake Wallula

April 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 21422 893 96 221.10 204.80 174.80 25.30 338.93 338.50 268.40 70.10
2 20642 860 96 184.10 182.30 165.30 12.40 339.09 339.19 267.82 71.37
3 18922 788 96 169.30 164.20 149.50 10.10 339.37 339.33 267.13 72.20
4 20702 863 96 181.00 180.80 166.10 10.00 339.37 339.29 267.68 71.61
5 20271 845 96 172.50 177.00 162.30 10.00 339.09 339.22 267.59 71.63
6 19446 810 96 160.00 170.20 156.10 9.40 338.54 338.65 267.35 71.30
7 17598 733 96 151.50 153.90 139.90 9.30 338.44 338.61 266.90 71.71
8 17204 717 96 150.10 151.80 138.00 9.20 338.31 338.48 266.92 71.56
9 18302 763 96 168.00 159.60 146.00 8.90 338.79 338.23 267.08 71.15
10 7221 301 96 186.90 181.70 56.40 120.60 339.01 338.81 266.43 72.38
11 7097 296 96 210.90 215.10 55.80 154.60 338.80 338.91 267.06 71.85
12 7143 298 96 213.90 218.90 56.60 157.60 338.56 338.69 267.39 71.30
13 7151 298 96 219.50 223.90 56.90 162.40 338.32 338.38 267.30 71.08
14 7197 300 96 253.00 253.40 57.80 190.80 338.30 338.28 267.83 70.45
15 7108 296 96 237.10 235.10 56.90 173.60 338.41 338.36 267.65 70.71
16 7162 298 96 229.90 231.80 57.00 170.10 338.33 338.43 267.33 71.10
17 7165 299 96 219.10 223.60 56.80 162.10 338.10 338.13 266.85 71.28
18 7146 298 96 221.30 215.50 56.70 154.10 338.38 338.06 266.84 71.22
19 7027 293 96 215.30 210.80 55.50 150.60 338.63 338.60 267.00 71.60
20 7043 293 96 203.40 215.70 56.00 155.10 337.98 338.43 267.31 71.12
21 7120 297 96 200.60 195.00 56.30 134.10 338.28 338.24 266.69 71.55
22 7107 296 104 185.80 193.20 56.10 132.40 337.85 337.98 266.41 71.57
23 7084 295 120 202.00 201.00 56.20 140.10 337.92 337.82 266.57 71.25
24 7163 298 120 201.10 201.90 56.80 140.40 337.85 338.02 266.70 71.32
25 7015 292 120 199.00 200.20 55.80 139.70 337.83 337.88 266.82 71.06
26 7057 294 120 188.50 181.40 55.90 120.90 338.17 337.99 266.58 71.41
27 7020 293 120 178.40 185.20 55.60 125.00 337.81 338.09 266.70 71.39
28 7015 292 120 183.40 174.70 56.00 114.00 338.24 338.03 266.72 71.31
29 7016 292 120 188.60 185.70 55.90 125.10 338.42 338.29 266.75 71.54
30 7139 297 120 200.90 207.90 57.10 146.10 338.05 338.28 267.11 71.17
TOT323704  3080        
AVG 10790 450 103 196.54 196.54 86.07 105.80 338.44 338.44 267.10 71.34
MAX 21422   253.00 253.40 174.80 190.80 339.37 339.33 268.40 72.38
MIN 7015   150.10 151.80 55.50 8.90 337.81 337.82 266.41 70.10
BUILDING STRONG®