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	8404	350	120	69.20	72.00	65.70	1.60	338.58	338.74	265.65	73.09
6	9429	393	120	83.40	79.20	72.80	1.70	338.82	338.74	265.59	73.15
7	10856	452	120	97.90	94.70	82.20	7.80	338.98	338.93	265.94	72.99
8	10646	444	120	95.40	103.20	81.30	17.20	338.54	338.86	266.24	72.62
9	7440	310	120	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				77.00	72.60	62.70	5.20	339.46	339.34	265.17	74.17
13				85.50	85.40	75.50	5.20	339.46	339.43	265.46	73.97
14				78.70	80.50	67.70	8.20	339.33	339.47	265.75	73.72
15				70.50	73.90	61.90	7.30	339.17	339.49	265.64	73.85
16				66.10	70.20	63.80	1.70	338.97	339.05	265.73	73.32
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
1

TOT	80507		1080
AVG	8945	373	120	77.97	77.92	66.84	6.38	338.98	339.07	265.65	73.41

MAX	10856			97.90	103.20	82.20	19.10	339.46	339.49	266.24	74.17
MIN	7440			66.10	66.20	53.60	1.60	338.54	338.74	265.17	72.62