McNary Dam & Lake Wallula

October 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	8429	351	120	70.10	74.20	65.80	3.60	338.66	338.85	265.77	73.08
2	7729	322	120	69.50	66.20	59.90	1.70	338.87	338.88	265.44	73.44
3	8676	362	120	74.40	73.90	67.30	1.80	338.87	339.09	265.58	73.51
4	8897	371	120	73.20	76.00	69.60	1.70	338.74	339.02	265.81	73.21
5				69.20	72.00	65.70	1.60	338.58	338.74	265.65	73.09
6				83.40	79.20	72.80	1.70	338.82	338.74	265.59	73.15
7				97.90	94.70	82.20	7.80	338.98	338.93	265.94	72.99
8				95.40	103.20	81.30	17.20	338.54	338.86	266.24	72.62
9				91.50	81.20	57.40	19.10	339.08	339.04	265.88	73.16
10				69.90	72.90	53.60	14.60	338.95	339.02	265.55	73.47
11				75.20	70.60	62.20	3.60	339.18	339.15	265.27	73.88
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1

TOT	33732		480
AVG	8433	351	120	79.06	78.55	67.07	6.76	338.84	338.94	265.70	73.24

MAX	8897			97.90	103.20	82.20	19.10	339.18	339.15	266.24	73.88
MIN	7729			69.20	66.20	53.60	1.60	338.54	338.74	265.27	72.62