US Army Corps of Engineers

Lower Monumental Dam

Sunday September 20, 2026

New Date:

HourTotal Outflow kcfsGeneration Flow kcfsSpill kcfsForebay ElevationTailwater ElevationAverage HeadNav Lock Tailwater Elevation
1 14.30 12.20 0.00 538.65 438.80 99.85 438.90
2 12.80 12.20 0.00 538.48 438.66 99.82 438.73
3 12.80 12.20 0.00 538.60 438.68 99.92 438.77
4 12.80 12.20 0.00 538.51 438.66 99.85 438.75
5 12.80 12.20 0.00 538.59 438.75 99.84 438.86
6 20.60 12.20 7.80 538.51 438.13 100.38 438.94
7 20.90 12.20 8.10 538.61 438.05 100.56 438.70
8 21.20 12.60 8.00 538.51 438.28 100.23 438.97
9 21.30 12.70 8.00 538.58 438.16 100.42 438.76
10 21.20 12.50 8.00 538.43 438.07 100.36 438.68
11 22.60 12.60 8.00 538.57 438.17 100.40 438.73
12 21.20 12.50 8.00 538.43 438.04 100.39 438.69
13 21.00 12.50 7.90 538.45 438.30 100.15 439.05
14 21.30 12.70 8.00 538.46 438.13 100.33 438.85
15 21.20 12.70 7.90 538.43 438.10 100.33 438.72
16 21.20 12.70 7.90 538.44 438.17 100.27 438.77
17 21.00 12.50 7.80 538.43 438.12 100.31 438.32
18 13.40 12.70 0.00 538.45 438.63 99.82 438.72
19 14.80 12.70 0.00 538.32 438.70 99.62 438.84
20 12.90 12.30 0.00 538.49 438.47 100.02 438.46
21 12.90 12.30 0.00 538.34 438.76 99.58 438.88
22 13.00 12.40 0.00 538.58 438.67 99.91 438.74
23 13.10 12.50 0.00 538.34 438.64 99.70 438.67
24 13.10 12.50 0.00 538.52 438.80 99.72 438.91
AVG 17.22 12.45 3.98 538.49 438.41 100.07 438.77
MAX 22.60 12.70 8.10 538.65 438.80 100.56 439.05
MIN 12.80 12.20 0.00 538.32 438.04 99.58 438.32
BUILDING STRONG®