McNary Dam & Lake Wallula

March 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	19053	794	120	167.70	167.20	153.30	10.30	339.49	339.52	267.37	72.15
2	18967	790	120	164.70	165.90	152.10	10.30	339.45	339.53	267.19	72.34
3	19060	794	120	163.10	165.40	153.30	10.10	339.33	339.32	267.16	72.16
4	19031	793	120	158.70	159.00	153.00	4.20	339.28	339.31	267.17	72.14
5	19039	793	120	148.00	155.20	153.50	0.00	338.89	339.07	267.08	71.99
6	19045	794	120	154.80	157.20	153.70	1.80	338.88	338.73	266.81	71.92
7	19051	794	120	177.20	162.40	152.30	8.40	339.55	339.39	266.93	72.46
8				182.40	185.80	153.50	30.60	339.30	339.57	267.60	71.97
9				162.50	171.70	154.60	15.40	338.90	338.98	267.39	71.59
10				157.50	165.70	154.60	9.40	338.47	338.71	267.10	71.61
11				172.30	171.10	155.10	14.30	338.39	338.36	266.98	71.38
12				191.40	182.30	155.50	25.10	338.91	338.50	267.27	71.23
13				204.60	201.90	154.00	46.30	339.07	339.16	267.27	71.89
14				234.10	232.30	155.60	74.90	339.26	339.30	268.20	71.10
15								339.55
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

TOT	133245		840
AVG	19035	793	120	174.21	174.51	153.86	18.65	339.11	339.10	267.25	71.85

MAX	19060			234.10	232.30	155.60	74.90	339.55	339.57	268.20	72.46
MIN	18967			148.00	155.20	152.10	0.00	338.39	338.36	266.81	71.10