US Army Corps of Engineers

Rock Island Dam & Reservoir

April 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 7642 318 0 124.05 130.32 118.31 12.01 611.85 611.71 572.99 38.72
2 7309 305 0 117.21 120.83 110.02 10.80 611.79 611.69 572.33 39.36
3 7612 317 0 122.95 126.73 114.41 12.32 612.02 611.79 572.53 39.26
4 7735 322 0 119.37 123.94 113.68 10.26 611.13 611.75 571.83 39.92
5 7658 319 0 118.82 122.57 111.77 10.81 611.95 611.84 571.55 40.29
6 7702 321 0 119.23 124.12 112.85 11.27 611.74 611.73 571.60 40.13
7 6187 258 0 99.82 101.65 90.29 11.36 611.98 611.85 571.84 40.01
8 6962 290 0 112.56 116.73 106.59 10.14 612.04 611.44 572.44 39.00
9 6698 279 0 105.88 108.00 96.37 11.63 612.33 611.82 570.82 41.00
10 7896 329 0 128.01 132.26 116.99 15.27 611.49 612.01 571.67 40.34
11 7494 312 0 120.48 122.59 111.27 11.33 612.26 611.78 571.55 40.23
12 8201 342 0 145.38 150.76 127.62 23.15 612.55 612.21 573.18 39.03
13 7760 323 0 128.07 135.04 119.68 15.36 611.88 611.88 572.92 38.96
14 7982 333 0 132.64 138.59 125.27 13.32 611.57 611.83 573.65 38.18
15 7228 301 0 119.23 122.47 109.27 13.20 612.60 612.10 573.03 39.07
16 7059 294 0 116.67 120.43 107.26 13.17 612.26 612.01 572.80 39.21
17 7554 315 0 125.25 127.68 112.52 15.17 612.69 612.20 572.07 40.13
18 8385 349 0 137.46 141.94 123.59 18.35 612.58 612.44 572.08 40.36
19 7817 326 0 124.90 129.96 118.04 11.93 612.51 611.63 572.30 39.33
20 9156 382 0 152.71 157.89 143.51 14.38 612.87 612.18 573.45 38.73
21 8803 367 0 144.65 153.48 139.50 13.98 611.53 612.01 573.86 38.15
22 6728 280 0 111.25 113.04 96.78 16.26 612.57 612.03 571.34 40.69
23 6884 287 0 144.20 145.72 102.05 43.67 612.33 612.45 572.24 40.21
24 8244 344 0 157.46 163.78 131.84 31.94 611.98 612.07 574.16 37.91
25 8489 354 0 142.98 148.80 134.05 14.75 612.35 611.84 573.62 38.22
26 8055 336 0 130.49 136.55 123.30 13.25 612.32 612.31 573.08 39.23
27 7108 296 0 132.95 134.93 104.75 30.18 612.71 612.38 572.59 39.79
28 6725 280 0 129.00 130.20 100.89 29.31 612.98 612.17 572.72 39.45
29 8151 340 0 164.72 169.38 129.25 40.13 612.88 612.57 574.25 38.32
30 8225 343 0 148.07 156.02 130.77 25.25 611.97 612.18 574.08 38.10
TOT229449  0        
AVG 7648 319 0 129.22 133.55 116.08 17.46 612.19 612.00 572.62 39.38
MAX 9156   164.72 169.38 143.51 43.67 612.98 612.57 574.25 41.00
MIN 6187   99.82 101.65 90.29 10.14 611.13 611.44 570.82 37.91
BUILDING STRONG®