McNary Dam & Lake Wallula

June 2026

Day of Month	Inflow kcfs	Total Outflow kcfs	Generation Flow kcfs	Spill kcfs	Midnight Reservoir Elevation	Average Forebay Elevation	Average Tailwater Elevation	Average Head feet
1	224.50	216.20	53.00	158.50	338.05	337.71	266.25	71.46
2	229.50	236.10	53.20	178.20	337.70	337.75	266.31	71.44
3	245.80	241.30	53.20	183.40	337.94	337.74	266.43	71.31
4	247.50	215.90	53.80	157.40	339.66	338.81	266.14	72.67
5	230.00	236.40	55.60	176.10	339.29	339.68	266.74	72.94
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TOT
AVG	235.46	229.18	53.76	170.72	338.53	338.34	266.37	71.96

MAX	247.50	241.30	55.60	183.40	339.66	339.68	266.74	72.94
MIN	224.50	215.90	53.00	157.40	337.70	337.71	266.14	71.31