McNary Dam & Lake Wallula

April 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	22640	943	120	225.10	224.10	186.80	34.60	339.40	339.25	268.56	70.69
2	21994	916	120	201.60	206.60	179.20	24.70	339.13	339.39	268.36	71.03
3	22653	944	120	193.80	202.40	184.90	14.80	338.72	338.80	268.26	70.54
4	22625	943	120	201.00	197.50	184.70	10.10	338.91	338.76	268.24	70.52
5	22620	943	120	191.30	196.70	184.50	9.50	338.53	338.79	268.20	70.59
6	21247	885	102	181.60	184.80	172.90	9.20	338.40	338.44	267.75	70.69
7	20136	839	104	167.30	173.80	161.90	9.10	338.07	338.40	267.42	70.98
8	19920	830	120	167.80	174.10	162.80	8.60	337.64	337.87	267.22	70.65
9	19672	820	120	184.90	171.50	160.20	8.50	338.43	337.83	267.28	70.55
10	6721	280	120	187.80	175.50	52.30	120.50	339.08	338.63	266.20	72.43
11	6653	277	120	194.00	195.70	51.60	141.40	339.03	339.26	266.53	72.73
12	6681	278	120	200.70	204.10	52.10	149.30	338.77	338.86	266.58	72.28
13	6658	277	120	210.50	207.50	52.20	152.50	339.02	338.94	266.89	72.05
14	6721	280	120	207.00	207.00	52.60	150.90	339.04	339.01	266.74	72.27
15	6761	282	120	204.60	209.60	53.30	151.60	338.75	338.85	267.08	71.77
16	6765	282	120	214.90	210.00	53.50	151.80	338.99	338.80	267.16	71.64
17	6682	278	120	219.70	223.30	52.80	165.70	338.78	338.79	267.29	71.50
18	6681	278	120	220.90	227.10	52.90	169.50	338.45	338.61	267.17	71.44
19	6700	279	120	194.00	203.00	53.00	145.30	337.98	338.11	266.59	71.52
20	6793	283	120	215.40	215.80	53.90	157.20	337.98	338.08	266.85	71.23
21	6717	280	120	216.90	219.40	53.80	160.90	337.84	337.82	267.17	70.65
22	6674	278	120	224.00	213.70	53.50	155.50	338.40	338.19	267.50	70.69
23	6704	279	120	227.00	230.70	53.70	172.30	338.18	338.26	267.64	70.62
24	6694	279	120	236.70	225.20	53.10	167.40	338.83	338.44	267.07	71.37
25	6668	278	120	240.70	242.40	52.80	184.90	338.68	338.72	267.25	71.47
26	6641	277	120	234.60	237.40	52.60	180.10	338.56	338.83	267.38	71.45
27	6658	277	120	218.00	227.60	53.00	169.90	338.06	338.40	267.36	71.04
28	6708	279	120	211.90	220.30	53.90	161.70	337.60	337.68	267.26	70.42
29	6690	279	120	215.90	214.20	53.70	155.80	337.71	337.56	266.98	70.58
30	6694	279	120	229.30	224.50	53.40	166.50	337.96	337.93	266.93	71.00

TOT	334170		3566
AVG	11139	464	119	207.96	208.85	89.72	115.33	338.50	338.51	267.30	71.21

MAX	22653			240.70	242.40	186.80	184.90	339.40	339.39	268.56	72.73
MIN	6641			167.30	171.50	51.60	8.50	337.60	337.56	266.20	70.42