McNary Dam & Lake Wallula

May 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	6860	286	120	229.80	233.80	54.90	174.20	337.74	337.71	266.94	70.77
2	6733	281	120	236.60	231.80	53.70	173.40	338.00	338.02	267.11	70.91
3	6757	282	120	225.30	237.20	54.50	178.10	337.35	337.63	267.42	70.21
4	6752	281	120	235.80	221.90	54.20	163.00	338.08	337.61	267.06	70.55
5	6797	283	120	229.10	239.70	54.60	180.40	337.53	337.73	267.26	70.47
6	6667	278	120	241.80	225.80	53.30	167.80	338.36	337.90	267.06	70.84
7	6695	279	120	228.50	230.30	53.20	172.40	338.31	338.51	267.38	71.13
8	6669	278	120	222.10	220.20	53.30	162.20	338.42	338.32	267.48	70.84
9	6664	278	120	220.00	222.30	53.00	164.50	338.27	338.25	267.17	71.08
10	6645	277	120	252.50	250.40	53.20	192.50	338.39	338.39	267.65	70.74
11	6734	281	120	234.70	235.20	53.70	176.90	338.34	338.31	267.27	71.04
12	6737	281	120	235.80	239.40	53.80	180.90	338.17	338.23	267.30	70.93
13	6718	280	120	232.00	236.50	54.20	177.60	337.90	337.91	267.74	70.17
14	6651	277	120	242.70	239.30	53.60	181.00	338.10	337.91	267.62	70.29
15	6692	279	120	243.30	249.80	54.10	191.00	337.73	337.88	267.82	70.06
16	6651	277	120	243.20	236.00	53.50	177.70	338.15	338.02	267.67	70.35
17	6688	279	120	229.00	224.10	53.30	166.10	338.39	338.23	267.19	71.04
18	6736	281	120	220.40	227.10	53.50	168.90	338.03	338.30	267.03	71.27
19	6692	279	120	217.00	213.40	53.00	155.70	338.22	338.16	266.74	71.42
20	6752	281	120	210.40	210.40	53.30	152.40	338.23	338.18	266.60	71.58
21	6723	280	120	210.60	207.20	53.10	149.40	338.43	338.30	266.73	71.57
22	6678	278	120	200.40	192.70	52.20	135.90	338.83	338.78	266.40	72.38
23	6720	280	120	191.20	184.70	52.10	128.00	339.13	339.08	266.17	72.91
24	6656	277	120	176.70	180.60	51.60	124.30	338.98	339.08	266.24	72.84
25	6689	279	120	192.40	192.30	52.20	135.40	339.01	339.03	266.56	72.47
26	6666	278	120	196.80	192.10	52.10	135.30	339.18	338.99	266.63	72.36
27	6715	280	120	206.90	211.00	52.50	153.80	339.03	339.26	266.99	72.27
28	6669	278	120	208.10	218.00	52.90	160.50	338.51	338.76	267.08	71.68
29				203.60	211.60	53.00	153.90	338.09	338.21	267.09	71.12
30				205.30	205.10	52.90	147.50	338.07	338.34	267.30	71.04
31				199.10	207.30	52.70	150.00	337.63	338.02	266.64	71.38

TOT	187807		3360
AVG	6707	279	120	220.04	220.23	53.26	162.28	338.28	338.29	267.08	71.22

MAX	6860			252.50	250.40	54.90	192.50	339.18	339.26	267.82	72.91
MIN	6645			176.70	180.60	51.60	124.30	337.35	337.61	266.17	70.06