John Day & Lake Umatilla

December 2025

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	21871	911	46	130.90	118.00	116.90	0.00	264.62	264.33	159.91	104.42
2	22488	937	48	128.50	120.70	119.60	0.00	264.92	264.66	159.62	105.04
3	22928	955	47	127.90	122.70	121.30	0.00	265.12	265.05	159.53	105.52
4	24099	1004	46	124.70	130.20	129.00	0.00	264.82	264.89	160.60	104.29
5	25005	1042	47	112.40	135.60	134.60	0.00	264.02	264.56	160.91	103.65
6	26254	1094	46	152.90	142.80	141.70	0.00	264.39	264.20	160.89	103.31
7	25781	1074	45	132.90	140.40	139.30	0.00	264.12	264.09	160.85	103.24
8	24605	1025	48	139.50	134.30	133.10	0.00	264.32	264.05	160.83	103.22
9	23705	988	47	128.60	128.60	127.60	0.00	264.32	264.23	160.50	103.73
10	27219	1134	45	158.70	148.30	147.10	0.00	264.72	264.48	161.17	103.31
11	27895	1162	44	156.60	151.50	150.40	0.00	264.92	264.69	161.15	103.54
12	30777	1282	45	174.50	166.60	165.60	0.00	265.22	265.08	161.43	103.65
13	31511	1313	46	186.00	178.20	167.70	9.30	265.50	265.36	160.64	104.72
14				187.30	179.50	168.40	10.00	265.82	265.64	160.68	104.96
15				158.90	174.50	170.50	2.90	265.22	265.53	161.15	104.38
16				166.30	179.30	176.20	1.90	264.72	264.95	161.41	103.54
17				173.50	182.20	178.50	2.70	264.32	264.42	161.84	102.58
18				197.80	225.50	204.10	20.20	263.21	263.74	161.92	101.82
19				212.30	212.30	204.60	6.70	263.21	263.18	162.61	100.57
20				197.20	207.10	205.90	0.00	262.81	263.02	162.47	100.55
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TOT	334138		600
AVG	25703	1071	46	157.37	158.91	155.10	2.69	264.52	264.51	161.01	103.50

MAX	31511			212.30	225.50	205.90	20.20	265.82	265.64	162.61	105.52
MIN	21871			112.40	118.00	116.90	0.00	262.81	263.02	159.53	100.55