McNary Dam & Lake Wallula

May 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	6860	286	120	229.80	233.80	54.90	174.20	337.74	337.71	266.94	70.77
2	6733	281	120	236.60	231.80	53.70	173.40	338.00	338.02	267.11	70.91
3	6757	282	120	225.30	237.20	54.50	178.10	337.35	337.63	267.42	70.21
4	6752	281	120	235.80	221.90	54.20	163.00	338.08	337.61	267.06	70.55
5	6797	283	120	229.10	239.70	54.60	180.40	337.53	337.73	267.26	70.47
6	6667	278	120	241.80	225.80	53.30	167.80	338.36	337.90	267.06	70.84
7	6695	279	120	228.50	230.30	53.20	172.40	338.31	338.51	267.38	71.13
8				222.10	220.20	53.30	162.20	338.42	338.32	267.48	70.84
9				220.00	222.30	53.00	164.50	338.27	338.25	267.17	71.08
10				252.50	250.40	53.20	192.50	338.39	338.39	267.65	70.74
11				234.70	235.20	53.70	176.90	338.34	338.31	267.27	71.04
12				235.80	239.40	53.80	180.90	338.17	338.23	267.30	70.93
13				232.00	236.50	54.20	177.60	337.90	337.91	267.74	70.17
14				242.70	239.30	53.60	181.00	338.10	337.91	267.62	70.29
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TOT	47261		840
AVG	6752	281	120	233.34	233.13	53.80	174.64	338.07	338.03	267.32	70.71

MAX	6860			252.50	250.40	54.90	192.50	338.42	338.51	267.74	71.13
MIN	6667			220.00	220.20	53.00	162.20	337.35	337.61	266.94	70.17