US Army Corps of Engineers

John Day & Lake Umatilla

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
1 159.70 172.80 171.80 0.00 264.52 264.75 161.91 102.84
2 161.80 167.00 166.10 0.00 264.32 264.42 161.45 102.97
3 158.10 163.30 162.50 0.00 264.12 264.22 161.47 102.75
4 164.90 162.60 161.70 0.00 264.12 264.09 161.08 103.01
5 176.70 171.40 170.50 0.00 264.32 264.34 161.88 102.46
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
TOT           
AVG    164.24 167.42 166.52 0.00 264.28 264.36 161.56 102.81
MAX    176.70 172.80 171.80 0.00 264.52 264.75 161.91 103.01
MIN    158.10 162.60 161.70 0.00 264.12 264.09 161.08 102.46