Wanapum Dam & Lake

May 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	18133	756	17	176.60	171.80	130.60	39.10	571.00	570.64	493.06	77.58
2	17699	737	16	170.20	174.30	129.40	42.90	570.44	570.43	493.25	77.18
3	18049	752	16	163.00	161.80	131.40	28.40	570.60	570.43	492.79	77.64
4	14209	592	17	166.80	169.80	102.50	65.30	570.19	570.29	492.58	77.71
5	19289	804	17	179.40	171.90	139.00	30.90	571.22	570.90	493.18	77.72
6	17708	738	17	142.70	158.40	127.60	28.80	569.07	570.23	492.79	77.44
7	17151	715	17	145.70	145.40	124.50	18.90	569.12	568.71	491.95	76.76
8	14197	592	17	125.00	122.90	101.80	19.20	569.40	569.11	490.35	78.76
9	16737	697	18	174.90	161.70	120.00	39.70	571.21	570.78	492.45	78.33
10	16716	696	17	139.60	152.70	119.50	31.30	569.40	570.42	491.90	78.52
11	18024	751	17	160.50	157.10	130.20	24.90	569.86	569.76	492.02	77.74
12	18848	785	18	156.10	159.10	137.70	19.30	569.45	569.37	492.58	76.79
13	15635	651	16	140.80	137.00	111.20	23.80	569.97	570.00	491.44	78.56
14	16303	679	15	156.80	157.60	116.80	38.90	569.85	570.39	492.35	78.04
15	13912	580	16	160.80	156.60	99.30	55.30	570.42	570.41	492.29	78.12
16	13829	576	16	140.50	142.90	98.30	42.70	570.09	570.32	491.20	79.12
17	14374	599	16	141.20	156.30	104.30	50.00	568.00	569.15	492.14	77.01
18	17506	729	17	161.10	149.20	128.30	18.80	569.65	568.67	491.95	76.72
19	18443	768	16	152.20	155.90	134.70	19.20	569.14	569.22	492.55	76.67
20	18813	784	16	164.90	158.30	136.70	19.60	570.04	569.79	492.70	77.09
21	18687	779	16	154.90	156.80	134.90	19.80	569.79	570.11	492.57	77.54
22	17655	736	16	151.00	148.20	126.40	19.80	570.18	570.04	492.06	77.98
23	14262	594	17	124.20	135.20	102.70	30.50	568.66	569.55	491.18	78.37
24	15516	646	18	119.40	133.20	112.20	19.00	566.73	568.89	491.53	77.36
25	15252	636	17	144.60	131.60	111.50	18.10	568.55	567.57	491.18	76.39
26	17362	723	15	142.60	147.70	127.20	18.50	567.84	568.14	491.84	76.30
27	16995	708	16	140.30	145.80	125.50	18.30	567.07	567.85	491.91	75.94
28	15583	649	18	151.50	133.60	113.40	18.20	569.55	567.82	491.01	76.81
29				149.70	149.30	105.20	42.10	569.61	569.84	491.93	77.91
30				123.90	125.30	101.10	22.20	569.42	570.21	491.15	79.06
31				155.50	144.60	117.40	25.10	570.93	570.57	492.09	78.48

TOT	466887		465
AVG	16675	695	17	150.85	150.71	119.40	29.31	569.56	569.66	492.06	77.60

MAX	19289			179.40	174.30	139.00	65.30	571.22	570.90	493.25	79.12
MIN	13829			119.40	122.90	98.30	18.10	566.73	567.57	490.35	75.94