US Army Corps of Engineers

Lower Monumental Dam

Friday September 18, 2026

New Date:

HourTotal Outflow kcfsGeneration Flow kcfsSpill kcfsForebay ElevationTailwater ElevationAverage HeadNav Lock Tailwater Elevation
1 13.10 12.50 0.00 538.75 438.77 99.98 438.91
2 13.10 12.50 0.00 538.45 438.73 99.72 438.83
3 13.10 12.50 0.00 538.79 438.77 100.02 438.92
4 13.20 12.60 0.00 538.57 438.74 99.83 438.84
5 13.20 12.60 0.00 538.71 438.83 99.88 439.02
6 21.00 12.60 7.90 538.58 438.28 100.30 439.00
7 21.30 12.50 8.20 538.80 438.09 100.71 438.80
8 21.80 13.00 8.20 538.69 438.42 100.27 439.26
9 21.70 12.90 8.20 538.71 438.17 100.54 438.77
10 22.00 13.30 8.20 538.62 438.18 100.44 438.86
11 21.80 13.00 8.20 538.65 438.41 100.24 439.22
12 21.60 12.90 8.10 538.55 438.31 100.24 439.14
13 21.80 13.10 8.00 538.54 438.45 100.09 439.28
14 21.70 13.10 8.10 538.54 438.53 100.01 439.43
15 21.50 12.90 8.00 538.45 438.33 100.12 439.10
16 21.80 13.20 8.00 538.48 438.51 99.97 439.39
17 21.60 13.10 7.90 538.43 438.42 100.01 438.85
18 18.60 17.90 0.10 538.44 438.92 99.52 439.13
19 18.00 17.40 0.00 538.37 438.84 99.53 438.99
20 17.70 17.10 0.00 538.45 438.65 99.80 438.67
21 17.70 17.10 0.00 538.43 438.78 99.65 438.88
22 18.00 17.40 0.00 538.47 438.67 99.80 438.71
23 18.00 17.40 0.00 538.47 438.84 99.63 438.99
24 18.10 17.50 0.00 538.47 438.84 99.63 439.01
AVG 18.81 14.17 4.05 538.56 438.56 100.00 439.00
MAX 22.00 17.90 8.20 538.80 438.92 100.71 439.43
MIN 13.10 12.50 0.00 538.37 438.09 99.52 438.67
BUILDING STRONG®