Wanapum Dam & Lake

October 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	7726	322	17	67.60	57.10	54.00	1.10	567.85	567.14	487.37	79.77
2	8032	335	18	53.60	59.70	56.50	1.20	566.99	567.16	487.91	79.25
3	8156	340	19	59.80	60.90	57.90	1.10	566.83	566.89	487.64	79.25
4	7063	294	19	54.60	52.50	49.50	1.00	567.12	566.55	486.78	79.77
5	7921	330	19	69.10	57.60	54.10	1.40	568.73	568.10	487.33	80.77
6	11077	462	19	80.60	81.30	77.80	1.50	568.64	568.27	488.81	79.46
7	12044	502	18	88.10	88.10	84.50	1.60	568.63	568.51	488.80	79.71
8	12053	502	18	86.10	88.30	85.20	1.10	568.34	567.62	488.60	79.02
9	8499	354	17	47.60	61.90	58.80	1.20	566.34	567.12	487.07	80.05
10				69.90	60.60	57.70	0.90	567.64	566.42	486.97	79.45
11				50.20	57.00	53.90	1.10	566.69	567.03	487.11	79.92
12				89.00	75.60	72.30	1.20	568.58	567.37	488.16	79.21
13				57.80	72.80	69.80	1.10	566.47	566.79	488.26	78.53
14				54.50	58.10	55.30	0.90	565.96	566.09	487.33	78.76
15				58.70	47.90	41.60	4.30	567.48	566.85	485.89	80.96
16				48.50	47.90	44.80	1.10	567.55	567.02	486.27	80.75
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TOT	82571		164
AVG	9175	382	18	64.73	64.21	60.86	1.36	567.49	567.18	487.52	79.66

MAX	12053			89.00	88.30	85.20	4.30	568.73	568.51	488.81	80.96
MIN	7063			47.60	47.90	41.60	0.90	565.96	566.09	485.89	78.53