McNary Dam & Lake Wallula

August 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	7102	296	120	138.20	128.50	54.40	69.40	339.12	339.01	264.78	74.23
2	6794	283	120	124.80	128.90	51.90	72.30	338.91	339.07	264.67	74.40
3	6829	285	120	100.10	110.40	52.30	53.40	338.35	338.66	264.45	74.21
4	7090	295	120	115.50	115.10	54.40	56.10	338.35	338.39	264.29	74.10
5	7269	303	120	122.20	125.80	55.90	65.20	338.18	338.42	264.37	74.05
6	6725	280	120	123.60	128.50	52.00	71.80	337.92	338.13	264.35	73.78
7	6780	283	120	130.90	121.70	52.10	65.00	338.43	338.20	264.21	73.99
8	6764	282	120	139.80	125.50	51.40	69.40	339.15	338.98	264.25	74.73
9	6816	284	120	102.70	117.00	51.80	60.40	338.42	338.82	264.09	74.73
10	6743	281	120	101.40	111.30	51.60	55.00	337.89	338.16	263.86	74.30
11	6667	278	120	116.50	118.60	51.20	62.70	337.76	338.00	263.96	74.04
12	6750	281	120	110.70	113.80	52.10	57.00	337.58	337.63	263.94	73.69
13	6770	282	120	125.80	115.90	52.10	59.10	338.11	337.73	263.87	73.86
14	6765	282	120	114.90	117.80	52.00	61.10	337.98	337.95	264.08	73.87
15	6681	278	120	114.50	118.50	51.60	62.20	337.72	337.90	264.31	73.59
16	6732	280	120	121.10	114.90	52.00	58.10	338.07	337.81	264.21	73.60
17	6761	282	120	115.60	114.80	52.00	58.10	338.09	338.26	264.31	73.95
18	6676	278	120	112.40	110.50	51.30	54.50	338.23	338.28	264.37	73.91
19	6652	277	120	98.30	107.90	51.10	52.10	337.71	338.16	264.23	73.93
20	6715	280	120	121.60	114.10	51.80	57.60	338.09	338.00	264.32	73.68
21	6771	282	120	128.70	114.30	51.90	57.80	338.88	338.55	264.36	74.19
22	6761	282	120	104.70	110.40	51.60	54.10	338.54	338.86	264.43	74.43
23	6731	280	120	92.10	95.70	51.20	39.80	338.36	338.59	264.01	74.58
24	6724	280	120	110.00	111.40	51.60	55.20	338.31	338.40	264.32	74.08
25	6766	282	120	120.40	114.90	51.80	58.40	338.58	338.56	264.38	74.18
26	7185	299	120	124.60	122.50	54.90	63.00	338.68	338.72	264.51	74.21
27	6834	285	120	121.80	121.10	52.30	64.10	338.74	338.74	264.51	74.23
28	7283	303		116.20	120.90	55.80	60.30	338.47	338.78	264.61	74.17
29	6803	283	120	86.80	94.00	52.30	37.00	338.12	338.38	264.26	74.12
30	6657	277	120	85.90	92.00	51.10	36.20	337.76	337.85	263.84	74.01
31	6688	279	120	85.90	87.70	51.20	31.70	337.67	337.93	263.75	74.18

TOT	211283		3600
AVG	6816	284	120	113.80	114.34	52.28	57.36	338.26	338.35	264.25	74.10

MAX	7283			139.80	128.90	55.90	72.30	339.15	339.07	264.78	74.73
MIN	6652			85.90	87.70	51.10	31.70	337.58	337.63	263.75	73.59