Wanapum Dam & Lake

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	169.40	168.20	138.00	28.20	571.08	570.69	493.41	77.28
2	196.30	196.10	149.60	44.60	571.11	570.86	494.63	76.23
3	202.00	204.10	138.60	63.50	570.82	570.94	494.86	76.08
4	193.40	198.20	134.30	61.90	570.16	570.28	494.45	75.83
5	171.90	170.80	137.90	30.90	570.32	569.71	493.33	76.38
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TOT
AVG	186.60	187.48	139.68	45.82	570.70	570.50	494.14	76.36

MAX	202.00	204.10	149.60	63.50	571.11	570.94	494.86	77.28
MIN	169.40	168.20	134.30	28.20	570.16	569.71	493.33	75.83