Wanapum Dam & Lake

August 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	11805	492	19	98.80	104.10	83.30	18.80	567.90	568.63	489.42	79.21
2	9676	403	18	89.40	88.20	68.20	18.00	568.07	567.45	488.39	79.06
3	9524	397	20	102.40	87.30	66.80	18.50	570.15	568.25	488.49	79.76
4	11343	473	21	84.90	101.10	80.50	18.60	567.92	568.23	489.50	78.73
5	11082	462	20	103.80	99.30	79.20	18.10	568.54	567.55	489.27	78.28
6	11154	465	21	86.90	101.10	81.60	17.50	566.56	566.65	489.95	76.70
7	12363	515	21	119.00	110.50	90.80	17.60	567.75	566.92	490.41	76.51
8	10266	428	21	91.20	94.00	75.00	17.10	567.35	566.03	489.26	76.77
9	9228	384	20	96.00	85.90	66.20	17.70	568.76	567.02	488.95	78.07
10	9612	400	20	88.30	89.10	69.10	18.10	568.64	567.52	489.46	78.06
11				94.40	84.10	63.40	18.70	570.07	568.47	488.34	80.13
12				104.00	99.00	87.70	9.30	570.76	569.75	489.77	79.98
13				95.20	97.40	93.70	1.70	570.45	570.10	489.59	80.51
14				98.20	99.50	95.60	1.90	570.28	569.58	490.05	79.53
15				96.10	94.10	90.10	2.00	570.56	569.90	489.87	80.03
16				93.40	105.80	99.90	3.90	568.85	569.22	490.31	78.91
17				100.00	96.70	93.20	1.50	569.31	568.27	489.60	78.67
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TOT	106053		201
AVG	10605	442	20	96.59	96.31	81.43	12.88	568.94	568.21	489.45	78.76

MAX	12363			119.00	110.50	99.90	18.80	570.76	570.10	490.41	80.51
MIN	9228			84.90	84.10	63.40	1.50	566.56	566.03	488.34	76.51