McNary Dam & Lake Wallula

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	15363	640	120	130.50	123.80	119.10	0.00	339.21	339.26	265.24	74.02
2	15452	644	120	109.70	125.40	120.70	0.00	338.42	338.89	265.53	73.36
3	15172	632	120	114.70	125.40	120.70	0.00	337.80	338.21	265.86	72.35
4	14109	588	120	119.80	116.70	112.00	0.00	337.96	337.92	265.61	72.31
5	15698	654	120	126.90	130.00	125.30	0.00	337.82	337.92	265.81	72.11
6	15806	659	120	142.20	129.50	124.80	0.00	338.46	338.23	265.74	72.49
7	16016	667	120	131.60	129.70	125.00	0.00	338.63	338.62	265.34	73.28
8	16091	670	120	131.90	129.50	124.80	0.00	338.72	338.57	265.24	73.33
9	15822	659	120	125.70	127.00	122.30	0.00	338.65	338.88	265.40	73.48
10	18504	771	120	138.10	151.80	147.10	0.00	337.93	338.44	266.27	72.17
11	18009	750	120	138.20	150.60	145.90	0.00	337.24	337.60	266.37	71.23
12				166.20	161.40	156.70	0.00	337.54	337.29	266.94	70.35
13				173.10	165.30	160.60	0.00	337.94	337.77	267.28	70.49
14				159.50	162.20	157.50	0.00	337.77	337.91	267.57	70.34
15				148.70	143.40	138.70	0.00	338.11	337.93	267.05	70.88
16				146.50	151.90	139.10	8.40	337.80	337.84	266.58	71.26
17				179.50	163.30	138.50	20.70	338.71	337.85	266.71	71.14
18				201.40	189.50	149.00	36.50	339.22	338.95	266.31	72.64
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TOT	176042		1320
AVG	16004	667	120	143.57	143.13	134.88	3.64	338.22	338.23	266.16	72.07

MAX	18504			201.40	189.50	160.60	36.50	339.22	339.26	267.57	74.02
MIN	14109			109.70	116.70	112.00	0.00	337.24	337.29	265.24	70.34