Wanapum Dam & Lake

April 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	18646	777	17	133.80	142.40	135.40	6.10	569.46	570.22	492.33	77.89
2	14029	585	17	120.20	115.50	98.80	15.70	570.11	569.87	490.07	79.80
3	17784	741	18	128.80	135.50	128.50	6.00	569.20	569.70	491.47	78.23
4	16571	690	17	127.20	134.10	122.60	10.50	568.23	568.83	491.04	77.79
5	16020	668	17	125.70	123.40	117.20	4.20	568.56	568.62	490.65	77.97
6	16853	702	17	127.60	125.70	123.70	0.00	568.82	568.57	491.27	77.30
7	13110	546	17	105.10	100.90	92.10	6.80	569.40	569.87	489.41	80.46
8	15018	626	18	118.80	121.00	105.70	13.30	569.11	570.04	490.65	79.39
9	14093	587	18	111.40	122.10	101.30	18.70	567.62	568.29	490.62	77.67
10	15452	644	17	134.90	133.50	112.90	18.60	567.82	568.16	491.36	76.80
11	14553	606	17	127.10	125.70	105.00	18.70	568.02	568.43	490.77	77.66
12	17225	718	17	152.90	145.40	123.90	19.50	569.05	569.61	491.88	77.73
13	13639	568	16	139.50	130.40	96.60	31.80	570.30	570.13	490.91	79.22
14	15177	632	18	139.30	135.30	107.20	26.10	570.85	570.87	491.39	79.48
15	13448	560	17	126.90	132.70	95.30	35.40	570.06	570.79	491.34	79.45
16	12971	540	18	124.60	128.20	92.20	34.00	569.57	570.34	491.19	79.15
17	15776	657	16	130.00	146.80	115.30	29.50	567.23	568.95	491.81	77.14
18	15743	656	16	146.00	135.10	114.50	18.60	568.76	568.32	490.80	77.52
19	15838	660	16	133.40	134.60	113.30	19.30	568.59	569.34	491.02	78.32
20	17866	744	17	160.20	149.90	128.40	19.40	570.01	569.57	491.59	77.98
21	17959	748	17	154.90	154.00	127.60	24.40	570.13	570.46	491.75	78.71
22	14986	624	16	119.10	136.90	107.50	27.40	567.66	568.93	490.66	78.27
23	12053	502	17	151.60	139.80	87.10	50.60	569.30	568.97	490.62	78.35
24	17643	735	16	164.50	154.10	123.20	29.00	570.72	570.53	492.11	78.42
25	18443	768	16	150.80	154.70	132.60	20.00	570.19	570.39	492.43	77.96
26	17099	712	16	139.30	144.80	122.90	19.90	569.44	570.17	491.68	78.49
27	16335	681	16	142.70	138.50	116.90	19.60	570.02	569.74	491.38	78.36
28	15686	654	17	131.20	139.10	111.50	25.70	568.93	570.14	491.12	79.02
29	17065	711	17	173.10	158.40	122.00	34.30	570.95	570.65	492.18	78.47
30	18627	776	16	160.10	164.60	134.40	28.30	570.34	570.74	493.05	77.69

TOT	475708		505
AVG	15857	661	17	136.69	136.77	113.85	21.05	569.28	569.64	491.29	78.36

MAX	18646			173.10	164.60	135.40	50.60	570.95	570.87	493.05	80.46
MIN	12053			105.10	100.90	87.10	0.00	567.23	568.16	489.41	76.80