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				109.70	125.40	120.70	0.00	338.42	338.89	265.53	73.36
3				114.70	125.40	120.70	0.00	337.80	338.21	265.86	72.35
4				119.80	116.70	112.00	0.00	337.96	337.92	265.61	72.31
5				126.90	130.00	125.30	0.00	337.82	337.92	265.81	72.11
6				142.20	129.50	124.80	0.00	338.46	338.23	265.74	72.49
7				131.60	129.70	125.00	0.00	338.63	338.62	265.34	73.28
8				131.90	129.50	124.80	0.00	338.72	338.57	265.24	73.33
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

TOT	15363		120
AVG	15363	640	120	125.91	126.25	121.55	0.00	338.38	338.45	265.55	72.91

MAX	15363			142.20	130.00	125.30	0.00	339.21	339.26	265.86	74.02
MIN	15363			109.70	116.70	112.00	0.00	337.80	337.92	265.24	72.11