Wanapum Dam & Lake

June 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	19045	794	16	169.40	168.20	138.00	28.20	571.08	570.69	493.41	77.28
2	20174	841	16	196.30	196.10	149.60	44.60	571.11	570.86	494.63	76.23
3	18846	785	16	202.00	204.10	138.60	63.50	570.82	570.94	494.86	76.08
4	18120	755	16	193.40	198.20	134.30	61.90	570.16	570.28	494.45	75.83
5	18735	781	15	171.90	170.80	137.90	30.90	570.32	569.71	493.33	76.38
6	17885	745	15	171.30	168.80	129.30	37.50	570.66	570.77	493.25	77.52
7	16743	698	16	168.00	174.10	121.90	50.20	569.82	570.31	493.34	76.97
8	19946	831	15	183.90	175.50	147.10	26.40	570.97	570.15	493.66	76.49
9	17927	747	15	157.60	166.50	129.80	34.70	569.75	570.46	493.17	77.29
10	16628	693	15	118.70	142.60	121.90	18.70	566.43	568.32	491.69	76.63
11	16591	691	16	146.30	143.20	123.80	17.40	566.86	566.50	491.59	74.91
12				146.70	144.00	124.50	17.50	567.24	566.70	491.83	74.87
13				158.20	141.90	121.40	18.50	569.51	568.19	491.83	76.36
14				162.90	153.00	131.10	19.90	570.86	570.23	492.46	77.77
15				169.40	166.20	142.10	22.10	571.30	570.74	493.38	77.36
16				159.10	160.20	134.00	24.20	571.15	570.78	492.95	77.83
17				120.40	153.30	131.40	19.90	566.59	568.76	492.38	76.38
18				136.10	137.80	118.30	17.50	566.34	566.72	491.35	75.37
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TOT	200640		171
AVG	18240	760	16	162.87	164.69	131.94	30.76	569.50	569.51	492.98	76.53

MAX	20174			202.00	204.10	149.60	63.50	571.30	570.94	494.86	77.83
MIN	16591			118.70	137.80	118.30	17.40	566.34	566.50	491.35	74.87