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	3019	126	14	22.00	21.80	17.00		538.57	538.72
5	3883	162	14	27.00	26.80	21.90	4.10	538.65	538.70	438.73	99.97
6	2879	120	14	23.10	24.60	16.20	7.80	538.20	538.29	438.35	99.94
7	3283	137	14	24.00	23.20	18.60	4.00	538.43	538.39	438.54	99.85
8	3068	128	14	23.20	22.10	17.30	4.00	538.77	538.38	438.39	99.99
9	3351	140	14	24.40	23.70	18.90	4.00	538.97	538.48	438.62	99.86
10	3599	150	14	24.10	25.20	20.30	4.00	538.64	538.51	438.56	99.95
11				25.60	24.80	20.20	4.10	538.87	538.63	438.58	100.05
12				19.60	21.70	13.10	7.80	538.23	538.36	438.07	100.29
13				19.20	18.90	14.30	3.90	538.33	538.21	438.40	99.81
14				20.70	20.50	15.60	3.80	538.41	538.40	438.63	99.77
15				20.80	21.20	16.30	4.00	538.25	538.35	438.81	99.54
16				20.40	20.10	15.30	4.00	538.39	538.40	438.65	99.75
17				18.90	18.30	13.50	4.00	538.54	538.39	438.44	99.95
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TOT	31747		149
AVG	3175	132	15	21.92	21.96	16.90	4.29	538.52	538.44	438.46	99.96

MAX	3883			27.00	26.80	21.90	7.80	538.97	538.72	438.81	100.32
MIN	2276			17.60	17.50	12.80	1.40	538.20	538.21	438.05	99.54