US Army Corps of Engineers

John Day & Lake Umatilla

March 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 33386 1391 50 178.20 178.20 177.70 0.00 265.92 265.94 161.66 104.28
2 33310 1388 51 176.20 178.80 178.40 0.00 265.82 265.86 162.13 103.73
3 32671 1361 52 174.70 174.70 174.30 0.00 265.82 265.83 161.68 104.15
4 32556 1357 51 164.00 174.50 174.10 0.00 265.42 265.64 161.72 103.92
5 31469 1311 50 169.40 169.40 169.00 0.00 265.42 265.45 161.85 103.60
6 31770 1324 50 165.60 170.90 170.50 0.00 265.22 265.29 161.67 103.62
7 31574 1316 49 175.30 170.10 169.70 0.00 265.42 265.21 161.66 103.55
8 32841 1368 48 193.00 184.80 184.40 0.00 265.82 265.54 162.25 103.29
9 36150 1506 52 184.70 195.20 194.80 0.00 265.52 265.61 162.42 103.19
10 32471 1353 53 180.20 175.00 174.60 0.00 265.42 265.52 162.07 103.45
11 35264 1469 53 173.00 191.20 190.80 0.00 264.82 265.19 162.44 102.75
12 35688 1487 53 201.70 193.90 193.50 0.00 265.12 264.98 162.41 102.57
13 37780 1574 49 211.70 203.90 203.50 0.00 265.52 265.14 161.86 103.28
14 38938 1622 51 247.10 234.00 210.60 23.00 265.92 265.65 162.58 103.07
15 38655 1611 52 260.60 258.00 209.70 47.90 266.02 266.08 163.31 102.77
16 240.10 248.00 208.80 38.80 265.72 265.70 163.23 102.47
17 192.10 192.10 191.70 0.00 265.72 265.68 162.36 103.32
18 188.30 193.50 193.10 0.00 265.52 265.74 162.71 103.03
19 199.40 199.40 198.90 0.00 265.42 265.52 162.44 103.08
20 224.70 209.10 208.60 0.00 266.22 265.76 163.01 102.75
21 250.30 250.30 208.50 41.30 266.12 266.09 163.16 102.93
22 254.40 262.20 203.40 58.40 265.82 266.06 163.12 102.94
23 266.02
24
25
26
27
28
29
30
31
TOT514524  764        
AVG 34302 1429 51 200.21 200.33 190.39 9.52 265.64 265.61 162.35 103.26
MAX 38938   260.60 262.20 210.60 58.40 266.22 266.09 163.31 104.28
MIN 31469   164.00 169.40 169.00 0.00 264.82 264.98 161.66 102.47
BUILDING STRONG®