US Army Corps of Engineers

Lower Granite Dam & Lake

January 2026

Day of MonthTotal Generation MWhAverage Generation MWStation Use MWhInflow kcfsTotal Outflow kcfsGeneration Flow kcfsSpill kcfsMidnight Reservoir ElevationAverage Forebay ElevationAverage Tailwater ElevationAverage Head feetMidnight Lewiston Gage ft
1 6537 272 18 38.60 37.20 36.80 0.00 736.02 736.08 636.46 99.62 736.49
2 6685 279 17 37.00 38.20 37.80 0.00 735.72 735.99 636.65 99.34 736.10
3 7389 308 16 41.30 42.40 42.00 0.00 735.43 735.92 636.75 99.17 735.89
4 7027 293 16 41.30 40.10 39.70 0.00 735.73 735.89 636.30 99.59 736.10
5 8054 336 16 45.40 45.60 45.20 0.00 735.67 735.84 635.64 100.20 736.12
6 7790 325 17 43.40 43.60 43.20 0.00 735.63 736.17 634.71 101.46 737.00
7 7705 321 17 45.20 42.90 42.60 0.00 736.20 736.07 634.07 102.00 736.45
8 8819 367 17 51.00 48.80 48.50 0.00 736.76 736.64 634.52 102.12 737.20
9 8787 366 17 48.30 48.80 48.80 0.00 736.65 736.76 635.59 101.17 737.10
10 8231 343 17 45.10 46.20 46.20 0.00 736.37 736.47 636.66 99.81 737.00
11 6945 289 17 41.30 39.30 39.30 0.00 736.86 736.27 636.91 99.36 737.40
12 7611 317 16 42.30 43.30 43.20 0.00 736.61 735.84 636.81 99.03 736.53
13 7337 306 16 40.60 41.40 41.20 0.00 736.42 736.66 636.93 99.73 736.36
14 7047 294 16 39.40 39.90 39.80 0.00 736.28 736.44 636.89 99.55 736.31
15 6939 289 17 39.60 39.10 39.10 0.00 736.40 736.40 636.58 99.82 736.45
16 7338 306 17 39.60 42.20 42.10 0.00 735.76 735.87 636.98 98.89 735.90
17 6714 280 17 38.20 38.30 38.30 0.00 735.74 735.70 636.47 99.23 735.72
18 6035 251 17 34.40 34.20 34.20 0.00 735.78 736.26 636.07 100.19 736.06
19 6449 269 17 35.50 36.50 36.40 0.00 735.54 735.71 635.39 100.32 735.49
20 6032 251 18 35.00 33.60 33.60 0.00 735.89 735.90 634.71 101.19 735.91
21 34.80 34.40 34.30 0.00 736.01 736.43 634.32 102.11 736.22
22 34.00 34.10 34.00 0.00 735.97 736.16 634.00 102.16 736.12
23 32.30 33.00 32.90 0.00 735.79 735.88 633.80 102.08 735.75
24 31.80 31.90 31.90 0.00 735.76 735.86 633.75 102.11 735.90
25 30.00 30.50 30.50 0.00 735.65 735.85 633.72 102.13 735.90
26 28.70 27.30 27.20 0.00 735.99 735.91 633.63 102.28 736.30
27 30.30 30.20 30.20 0.00 736.03 735.84 634.32 101.52 736.14
28
29
30
31
TOT145470  334         
AVG 7273 303 17 38.68 38.63 38.48 0.00 736.02 736.10 635.50 100.60 736.29
MAX 8819   51.00 48.80 48.80 0.00 736.86 736.76 636.98 102.28 737.40
MIN 6032   28.70 27.30 27.20 0.00 735.43 735.70 633.63 98.89 735.49
BUILDING STRONG®