US Army Corps of Engineers

Lower Monumental Dam & Lake

October 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 2556 107 14 16.30 16.60 14.40 1.40 538.72 538.82 438.55 100.27
2 2513 105 14 16.60 16.20 14.10 1.40 538.86 538.81 438.45 100.36
3 2503 104 14 16.40 16.20 14.10 1.40 538.90 538.84 438.54 100.30
4 2491 104 14 16.00 16.10 14.00 1.40 538.88 538.93 438.52 100.41
5 2552 106 14 16.00 16.50 14.40 1.40 538.74 538.93 438.68 100.25
6 3079 128 15 18.30 19.70 17.50 1.40 538.30 538.63 438.71 99.92
7 2350 98 15 16.10 18.10 13.30 3.90 538.18 538.16 438.32 99.84
8 2266 94 14 15.30 14.90 12.80 1.40 538.30 538.23 438.27 99.96
9 2294 96 14 14.90 15.10 12.90 1.30 538.27 538.30 438.34 99.96
10 2219 92 14 15.20 14.60 12.50 1.30 538.44 538.37 438.36 100.01
11 2217 92 13 14.60 14.50 12.50 1.30 538.42 538.48 438.32 100.16
12 2235 93 13 14.90 14.70 12.60 1.40 538.49 538.49 438.33 100.16
13 2714 113 16 16.70 17.40 15.30 1.40 538.26 538.48 438.63 99.85
14 2434 101 17 18.30 16.20 13.80 1.60 538.89 538.41 438.66 99.75
15 2403 100 17 15.10 15.70 13.50 1.40 538.74 538.81 438.50 100.31
16 2501 104 18 15.50 16.10 14.10 1.40 538.53 538.83 438.53 100.30
17 2191 91 18 14.60 14.50 12.40 1.40 538.57 538.56 438.68 99.88
18 2188 91 17 14.30 14.50 12.40 1.40 538.51 538.52 438.65 99.87
19 2195 91 17 14.30 14.50 12.40 1.40 538.45 538.53 438.63 99.90
20 2504 104 17 17.50 16.20 14.10 1.40 538.77 538.59 438.63 99.96
21 2230 93 16 13.90 14.80 12.60 1.40 538.55 538.58 438.79 99.79
22 2188 91 17 14.30 14.40 12.40 1.30 538.52 538.56 438.73 99.83
23 14.80 14.60 12.50 1.40 538.59 538.58 438.67 99.91
24 14.60 15.20 13.10 1.40 538.42 538.53 438.65 99.88
25 16.50 16.80 14.70 1.40 538.32 538.40 438.71 99.69
26 17.20 16.50 14.40 1.30 538.42 538.29 438.58 99.71
27 17.00 16.60 14.50 1.30 538.51 538.42 438.45 99.97
28 17.80 17.80 15.70 1.40 538.54 538.58 438.41 100.17
29 17.70 17.70 15.40 1.40 538.54 538.47 438.43 100.04
30
31
1
TOT 52826  337        
AVG 2401 100 15 15.89 15.96 13.74 1.47 538.54 538.56 438.54 100.01
MAX 3079   18.30 19.70 17.50 3.90 538.90 538.93 438.79 100.41
MIN 2188   13.90 14.40 12.40 1.30 538.18 538.16 438.27 99.69
BUILDING STRONG®