Lower Monumental Dam & Lake

September 2026

Day of Month	Total Generation MWh	Average Generation MW	Station Use MWh	Inflow kcfs	Total Outflow kcfs	Generation Flow kcfs	Spill kcfs	Midnight Reservoir Elevation	Average Forebay Elevation	Average Tailwater Elevation	Average Head feet
1	2910	121	22	20.40	21.10	16.40	3.90	538.52	538.37	438.05	100.32
2	2276	95	16	17.60	17.50	12.80	3.90	538.57	538.27	438.08	100.19
3	3479	145	14	21.70	21.80	19.60	1.40	538.55	538.62	438.53	100.09
4
5				27.00	26.80	21.90	4.10	538.65	538.70	438.73	99.97
6				23.10	24.60	16.20	7.80	538.20	538.29	438.35	99.94
7				24.00	23.20	18.60	4.00	538.43	538.39	438.54	99.85
8				23.20	22.10	17.30	4.00	538.77	538.38	438.39	99.99
9				24.40	23.70	18.90	4.00	538.97	538.48	438.62	99.86
10				24.10	25.20	20.30	4.00	538.64	538.51	438.56	99.95
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

TOT	8665		52
AVG	2888	120	17	22.83	22.89	18.00	4.12	538.59	538.45	438.43	100.02

MAX	3479			27.00	26.80	21.90	7.80	538.97	538.70	438.73	100.32
MIN	2276			17.60	17.50	12.80	1.40	538.20	538.27	438.05	99.85