US Army Corps of Engineers

Lower Monumental Dam

Monday September 21, 2026

New Date:

HourTotal Outflow kcfsGeneration Flow kcfsSpill kcfsForebay ElevationTailwater ElevationAverage HeadNav Lock Tailwater Elevation
1 13.10 12.50 0.00 538.43 438.65 99.78 438.71
2 13.00 12.40 0.00 538.42 438.74 99.68 438.87
3 13.00 12.40 0.00 538.44 438.76 99.68 438.73
4 13.10 12.50 0.00 538.37 438.67 99.70 438.73
5 13.60 12.40 0.50 538.45 438.61 99.84 439.31
6 20.70 12.30 7.80 538.22 438.17 100.05 438.82
7 20.80 12.20 8.00 538.53 438.09 100.44 438.63
8 20.80 12.30 7.90 538.28 438.31 99.97 438.99
9 21.10 12.70 7.90 538.44 438.17 100.27 438.79
10 13.90 12.70 0.60 538.28 438.61 99.67 438.67
11 13.20 12.60 0.00 538.33 438.77 99.56 438.90
12 13.10 12.50 0.00 538.38 438.46 99.92 438.42
13 13.20 12.60 0.00 538.25 438.75 99.50 438.90
14 13.20 12.60 0.00 538.46 438.71 99.75 438.78
15 13.20 12.60 0.00 538.21 438.65 99.56 438.73
16 13.30 12.70 0.00 538.45 438.84 99.61 439.01
17 13.10 12.50 0.00 538.29 438.68 99.61 438.79
18 13.40 12.80 0.00 538.39 438.74 99.65 438.89
19 13.00 12.40 0.00 538.37 438.71 99.66 438.78
20 13.00 12.40 0.00 538.33 438.73 99.60 438.81
21 13.30 12.70 0.00 538.45 438.81 99.64 438.94
22
23
24
AVG 14.67 12.51 1.56 538.37 438.60 99.77 438.82
MAX 21.10 12.80 8.00 538.53 438.84 100.44 439.31
MIN 13.00 12.20 0.00 538.21 438.09 99.50 438.42
BUILDING STRONG®