US Army Corps of Engineers

Lower Monumental Dam

Thursday May 21, 2026

New Date:

HourTotal Outflow kcfsGeneration Flow kcfsSpill kcfsForebay ElevationTailwater ElevationAverage HeadNav Lock Tailwater Elevation
1 56.30 12.10 43.60 538.48 438.47 100.01 438.52
2 56.60 12.20 43.90 538.42 438.60 99.82 438.84
3 56.90 12.10 44.10 538.33 438.55 99.78 438.60
4 56.70 12.10 44.00 538.23 438.57 99.66 438.69
5 56.80 12.20 43.90 538.10 438.56 99.54 438.71
6 57.00 12.20 44.20 538.56 438.60 99.96 438.79
7 56.90 12.20 44.10 538.55 438.60 99.95 438.86
8 56.90 12.20 44.10 538.79 438.64 100.15 439.19
9 58.30 12.20 44.00 538.79 438.56 100.23 438.95
10 56.80 12.20 44.00 538.70 438.62 100.08 438.87
11 58.60 12.20 44.30 538.84 438.69 100.15 438.92
12 56.80 12.20 44.00 538.79 438.60 100.19 438.84
13 60.90 12.10 48.20 538.69 438.99 99.70 439.52
14 58.60 12.10 45.80 538.73 438.57 100.16 438.75
15 56.70 12.10 44.00 538.69 438.60 100.09 438.76
16 56.80 12.10 44.00 538.61 438.71 99.90 438.96
17 56.90 12.20 44.10 538.60 438.56 100.04 438.86
18 58.30 12.20 44.00 538.60 438.64 99.96 438.88
19 52.80 12.30 40.00 538.57 438.45 100.12 438.64
20 52.60 12.20 39.90 538.59 438.46 100.13 438.62
21 52.70 12.10 40.00 538.63 438.44 100.19 438.52
22 52.80 12.20 40.00 538.63 438.40 100.23 438.60
23 52.80 12.10 40.00 538.65 438.38 100.27 438.49
24 54.10 12.10 39.90 538.65 438.34 100.31 438.41
AVG 56.27 12.16 43.25 538.59 438.57 100.03 438.79
MAX 60.90 12.30 48.20 538.84 438.99 100.31 439.52
MIN 52.60 12.10 39.90 538.10 438.34 99.54 438.41
BUILDING STRONG®