Wanapum Dam & Lake

December 2025

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	14102	588	18	97.50	102.30	100.90	0.00	567.72	568.30	489.96	78.34
2	13674	570	17	97.50	99.50	98.10	0.00	567.43	568.13	489.74	78.39
3	13431	560	18	98.10	98.50	97.10	0.00	567.38	567.07	489.67	77.40
4	13004	542	17	105.60	94.50	93.10	0.00	568.93	567.33	489.29	78.04
5	17784	741	17	135.70	130.30	128.90	0.00	569.68	568.93	491.48	77.45
6	17201	717	16	113.50	126.50	125.10	0.00	567.88	568.65	491.30	77.35
7	14766	615	16	106.50	109.10	107.70	0.00	567.52	567.59	490.70	76.89
8	14424	601	16	115.20	105.50	104.10	0.00	568.87	568.47	490.50	77.97
9	14557	607	17	98.90	105.70	104.30	0.00	567.92	568.88	490.58	78.30
10	11563	482	17	95.40	83.20	81.80	0.00	569.60	568.59	489.50	79.09
11	13985	583	16	105.10	100.20	98.80	0.10	570.27	569.78	490.62	79.16
12	16665	694	16	111.00	119.90	118.40	0.10	569.04	569.95	491.43	78.52
13				117.10	120.30	118.90	0.00	568.61	569.03	491.19	77.84
14				118.40	114.00	112.60	0.00	569.21	568.75	490.93	77.82
15				117.30	113.00	111.60	0.00	569.80	569.67	490.94	78.73
16				143.30	137.80	136.40	0.00	570.55	570.27	492.30	77.97
17				151.40	151.30	149.00	0.90	570.58	570.62	492.98	77.64
18				159.50	155.40	150.20	3.80	571.13	570.98	493.31	77.67
19				121.10	144.00	140.70	1.90	567.98	569.03	492.43	76.60
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TOT	175156		201
AVG	14596	608	17	116.22	116.37	114.62	0.36	568.95	568.95	490.99	77.96

MAX	17784			159.50	155.40	150.20	3.80	571.13	570.98	493.31	79.16
MIN	11563			95.40	83.20	81.80	0.00	567.38	567.07	489.29	76.60