US Army Corps of Engineers

Lower Monumental Dam & Lake

December 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 4198 175 18 24.70 24.40 23.80 0.00 538.94 538.89 439.31 99.58
2 2873 120 18 16.90 17.00 16.20 0.00 538.91 538.89 439.09 99.80
3 3001 125 18 17.90 17.60 16.90 0.00 539.00 538.95 439.04 99.91
4 4133 172 18 24.80 24.00 23.30 0.00 539.22 539.04 439.17 99.87
5 3746 156 18 20.70 21.90 21.10 0.00 538.88 538.86 438.97 99.89
6 3352 140 18 19.40 19.60 18.90 0.00 538.81 538.93 439.10 99.83
7 3288 137 17 19.20 19.30 18.60 0.00 538.80 538.87 439.17 99.70
8 5060 211 18 30.00 29.30 28.60 0.00 539.02 538.98 439.30 99.68
9 6173 257 17 34.00 35.40 34.80 0.00 538.59 539.07 439.40 99.67
10 6122 255 17 36.70 35.30 34.60 0.00 539.00 538.39 439.07 99.32
11 8061 336 16 43.00 46.40 45.70 0.00 537.98 538.46 439.03 99.43
12 8002 333 16 47.90 45.80 45.20 0.00 538.59 538.34 438.99 99.35
13 8311 346 17 46.50 47.60 46.80 0.00 538.28 538.50 438.91 99.59
14 7519 313 17 43.90 43.00 42.40 0.00 538.52 538.40 438.84 99.56
15 5432 226 17 32.40 31.20 30.40 0.00 538.91 538.73 438.59 100.14
16 6053 252 17 34.30 34.80 34.00 0.00 538.74 538.95 439.12 99.83
17 5498 229 17 33.00 33.00 31.00 1.20 538.76 538.59 439.09 99.50
18 8016 334 17 46.20 46.30 45.50 0.00 538.72 538.65 439.23 99.42
19 6596 275 17 36.70 37.80 37.20 0.00 538.39 538.90 438.89 100.01
20 7684 320 17 45.90 44.40 43.60 0.00 538.85 538.37 439.31 99.06
21 7970 332 18 46.10 45.30 44.80 0.00 539.09 539.16 439.38 99.78
22 7334 306 18 42.10 41.70 41.10 0.00 539.21 539.09 439.07 100.02
23 7228 301 18 41.00 41.00 40.50 0.00 539.20 539.35 439.36 99.99
24 5326 222 17 30.60 30.40 29.90 0.00 539.26 539.26 439.32 99.94
25 6720 280 18 37.10 38.10 37.70 0.00 538.98 539.10 439.33 99.77
26 7554 315 18 43.10 43.00 42.60 0.00 539.01 538.93 439.67 99.26
27 8656 361 18 50.30 49.30 48.90 0.00 539.28 539.10 439.69 99.41
28 9731 405 19 54.70 55.30 54.80 0.00 539.11 539.28 439.69 99.59
29 8637 360 19 48.10 49.00 48.60 0.00 538.82 538.98 439.49 99.49
30 7294 304 19 41.10 41.50 41.10 0.00 538.69 538.73 439.34 99.39
31 6614 276 19 38.80 37.80 37.30 0.00 538.98 538.87 439.22 99.65
TOT196182  545        
AVG 6328 264 18 36.36 36.34 35.67 0.04 538.86 538.86 439.20 99.66
MAX 9731   54.70 55.30 54.80 1.20 539.28 539.35 439.69 100.14
MIN 2873   16.90 17.00 16.20 0.00 537.98 538.34 438.59 99.06
BUILDING STRONG®