McNary Dam & Lake Wallula

April 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	22640	943	120	225.10	224.10	186.80	34.60	339.40	339.25	268.56	70.69
2	21994	916	120	201.60	206.60	179.20	24.70	339.13	339.39	268.36	71.03
3	22653	944	120	193.80	202.40	184.90	14.80	338.72	338.80	268.26	70.54
4	22625	943	120	201.00	197.50	184.70	10.10	338.91	338.76	268.24	70.52
5	22620	943	120	191.30	196.70	184.50	9.50	338.53	338.79	268.20	70.59
6	21247	885	102	181.60	184.80	172.90	9.20	338.40	338.44	267.75	70.69
7	20136	839	104	167.30	173.80	161.90	9.10	338.07	338.40	267.42	70.98
8	19920	830	120	167.80	174.10	162.80	8.60	337.64	337.87	267.22	70.65
9				184.90	171.50	160.20	8.50	338.43	337.83	267.28	70.55
10				187.80	175.50	52.30	120.50	339.08	338.63	266.20	72.43
11				194.00	195.70	51.60	141.40	339.03	339.26	266.53	72.73
12				200.70	204.10	52.10	149.30	338.77	338.86	266.58	72.28
13				210.50	207.50	52.20	152.50	339.02	338.94	266.89	72.05
14				207.00	207.00	52.60	150.90	339.04	339.01	266.74	72.27
15				204.60	209.60	53.30	151.60	338.75	338.85	267.08	71.77
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30

TOT	173835		926
AVG	21729	905	116	194.60	195.39	126.13	66.35	338.73	338.74	267.42	71.32

MAX	22653			225.10	224.10	186.80	152.50	339.40	339.39	268.56	72.73
MIN	19920			167.30	171.50	51.60	8.50	337.64	337.83	266.20	70.52