US Army Corps of Engineers

Rock Island Dam & Reservoir

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 6933 289 0 92.51 95.21 95.21 0.00 612.11 612.10 570.36 41.74
2 6785 283 0 89.82 92.87 92.87 0.00 612.15 612.13 570.07 42.06
3 6986 291 0 90.63 94.32 94.32 0.00 611.40 611.84 569.40 42.44
4 7647 319 0 104.87 105.95 105.95 0.00 611.93 611.85 569.98 41.87
5 9135 381 0 126.66 132.80 132.80 0.00 612.10 611.95 572.14 39.81
6 7883 328 0 108.52 112.88 112.88 0.00 611.74 611.84 571.32 40.52
7 7553 315 0 99.42 102.23 102.23 0.00 612.13 612.11 570.06 42.05
8 7862 328 0 107.16 112.29 111.37 0.92 612.22 611.92 571.05 40.87
9 6589 275 0 92.83 96.02 94.10 1.92 612.06 611.70 570.88 40.82
10 6714 280 0 87.91 92.44 92.31 0.13 611.85 612.05 570.36 41.69
11 7136 297 0 100.36 100.74 100.74 0.00 611.88 611.88 571.64 40.24
12 7480 312 0 104.88 106.92 106.92 0.00 612.22 611.81 572.01 39.80
13 7842 327 0 110.52 111.34 111.34 0.00 611.86 612.08 571.46 40.62
14 7818 326 0 112.57 113.19 112.19 1.00 612.55 612.23 571.41 40.82
15 7637 318 0 110.19 111.94 111.94 0.00 611.82 611.60 572.04 39.56
16 8898 371 0 128.62 135.43 135.43 0.00 611.00 611.63 573.34 38.29
17 8832 368 0 144.40 144.93 137.78 7.14 611.45 611.84 573.90 37.94
18 9394 391 0 153.05 151.03 149.71 1.32 612.65 611.95 574.53 37.42
19 7770 324 0 107.66 111.55 111.46 0.09 611.39 611.81 571.70 40.11
20 8616 359 0 134.30 133.23 131.47 1.76 612.69 611.83 572.82 39.01
21 8180 341 0 140.03 140.71 126.13 14.58 612.53 612.13 573.18 38.95
22 7546 314 0 152.18 148.85 116.85 32.00 612.55 612.25 573.55 38.70
23 7288 304 0 140.23 139.18 113.31 25.86 612.68 612.08 573.36 38.72
24 8900 371 0 141.59 141.32 140.77 0.55 612.39 611.50 573.79 37.71
25 8359 348 0 127.97 131.27 131.27 0.00 611.64 610.69 573.13 37.56
26 8834 368 0 135.78 138.53 138.53 0.00 611.86 611.03 573.44 37.59
27 8997 375 0 134.61 139.78 139.78 0.00 611.32 611.86 573.70 38.16
28 8714 363 0 128.72 131.60 130.43 1.17 611.68 612.00 572.23 39.77
29 9749 406 0 148.23 150.69 150.16 0.53 612.84 612.13 573.45 38.68
30 9450 394 0 139.47 146.77 146.08 0.69 612.14 612.17 573.58 38.59
31 8263 344 0 128.59 129.80 122.27 7.53 612.08 611.81 572.49 39.32
TOT249790  0        
AVG 8058 336 0 120.14 122.45 119.31 3.14 612.03 611.86 572.14 39.72
MAX 9749   153.05 151.03 150.16 32.00 612.84 612.25 574.53 42.44
MIN 6589   87.91 92.44 92.31 0.00 611.00 610.69 569.40 37.42
BUILDING STRONG®