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	9064	378	20	94.40	84.10	63.40	18.70	570.07	568.47	488.34	80.13
12	12510	521	20	104.00	99.00	87.70	9.30	570.76	569.75	489.77	79.98
13	13497	562	20	95.20	97.40	93.70	1.70	570.45	570.10	489.59	80.51
14	13679	570	20	98.20	99.50	95.60	1.90	570.28	569.58	490.05	79.53
15	12902	538	20	96.10	94.10	90.10	2.00	570.56	569.90	489.87	80.03
16	14098	587	20	93.40	105.80	99.90	3.90	568.85	569.22	490.31	78.91
17	13020	542	21	100.00	96.70	93.20	1.50	569.31	568.27	489.60	78.67
18	11774	491	21	85.90	86.40	83.20	1.20	569.24	568.58	489.02	79.56
19	12598	525	21	101.40	94.40	88.90	3.50	570.21	569.88	489.60	80.28
20	13764	574	21	101.10	101.10	97.60	1.50	570.21	569.67	489.96	79.71
21	14259	594	20	102.60	105.10	101.50	1.60	569.86	568.67	490.16	78.51
22	10036	418	20	73.10	73.40	69.60	1.80	569.82	569.37	488.56	80.81
23	10632	443	19	70.50	77.70	73.90	1.80	568.81	569.40	488.84	80.56
24	12843	535	19	92.30	95.40	92.00	1.40	568.38	568.06	489.36	78.70
25	14085	587	21	104.20	105.70	102.20	1.50	568.16	567.91	489.98	77.93
26	13327	555	21	102.50	98.80	95.40	1.40	568.67	567.91	489.64	78.27
27	14560	607	21	100.60	109.40	106.10	1.40	567.45	567.76	490.19	77.57
28	10773	449	20	76.70	80.30	77.40	1.00	566.95	566.43	488.59	77.84
29	8015	334	20	71.80	59.00	55.80	1.20	568.73	567.41	487.66	79.75
30	9743	406	19	63.50	71.20	67.60	1.50	567.66	568.41	488.35	80.06
31	9553	398	20	78.30	70.40	67.30	1.00	568.77	568.03	488.21	79.82

TOT	360785		625
AVG	11638	485	20	92.47	92.44	82.67	7.77	568.87	568.29	489.31	78.98

MAX	14560			119.00	110.50	106.10	18.80	570.76	570.10	490.41	80.81
MIN	8015			63.50	59.00	55.80	1.00	566.56	566.03	487.66	76.51