McNary Dam & Lake Wallula

January 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	178.50	189.30	185.30	0.00	338.63	338.91	267.16	71.75
2	172.20	188.50	184.50	0.00	337.80	338.02	267.29	70.73
3	188.20	185.50	181.50	0.00	337.94	337.79	267.23	70.56
4	182.60	185.50	181.60	0.00	337.77	337.82	267.36	70.46
5	181.90	180.10	176.70	0.00	337.93	337.96	267.17	70.79
6	175.80	177.80	175.00	0.00	337.76	337.46	267.15	70.31
7	192.80	172.60	169.80	0.00	338.83	338.18	266.69	71.49
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TOT
AVG	181.71	182.76	179.20	0.00	338.09	338.02	267.15	70.87

MAX	192.80	189.30	185.30	0.00	338.83	338.91	267.36	71.75
MIN	172.20	172.60	169.80	0.00	337.76	337.46	266.69	70.31