US Army Corps of Engineers

Rock Island Dam & Reservoir

September 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 7077 295 0 96.29 98.24 97.70 0.54 612.06 612.14 570.90 41.24
2 5156 215 0 71.23 69.24 69.00 0.24 612.58 612.25 569.54 42.71
3 4410 184 0 55.40 56.91 56.37 0.55 612.08 612.20 568.30 43.90
4 4834 201 0 61.27 61.59 61.59 0.00 611.97 611.95 567.48 44.47
5 3555 148 0 45.50 45.27 45.27 0.00 612.20 611.97 567.37 44.60
6 3169 132 0 38.64 40.37 40.37 0.00 611.65 611.95 567.18 44.77
7 3401 142 0 44.31 43.67 43.08 0.59 611.68 612.17 567.32 44.85
8 4065 169 0 52.18 52.14 52.14 0.00 611.86 611.97 566.94 45.03
9 4307 179 0 56.33 57.40 55.67 1.73 611.69 611.96 566.97 44.99
10 3504 146 0 43.98 45.30 44.17 1.13 611.30 611.79 566.10 45.69
11 3144 131 0 43.30 41.17 40.06 1.11 611.99 611.81 566.00 45.81
12 3479 145 0 46.14 44.05 44.05 0.00 611.81 612.24 566.68 45.56
13 2923 122 0 38.49 37.47 37.47 0.00 612.06 612.12 567.72 44.40
14 3269 136 0 45.02 44.01 42.50 1.50 612.12 612.31 568.08 44.23
15 54.55 53.85 50.53 3.33 611.97 612.23 568.20 44.03
16 43.69 42.72 42.57 0.15 612.38 612.05 568.07 43.98
17 52.57 53.00 53.00 0.00 612.17 611.96 567.68 44.28
18 50.19 48.42 48.42 0.00 612.49 612.15 567.47 44.68
19 49.55 51.78 51.78 0.00 611.83 612.04 567.63 44.41
20 41.80 41.34 41.13 0.21 611.97 611.94 567.52 44.42
21 56.70 57.11 57.11 0.00 611.80 612.07 567.48 44.59
22
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29
30
TOT 56293  0        
AVG 4021 168 0 51.77 51.67 51.14 0.53 611.98 612.06 567.65 44.41
MAX 7077   96.29 98.24 97.70 3.33 612.58 612.31 570.90 45.81
MIN 2923   38.49 37.47 37.47 0.00 611.30 611.79 566.00 41.24
BUILDING STRONG®