John Day & Lake Umatilla

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	11617	484	44	242.60	240.00	62.60	176.00	265.22	265.13	161.08	104.05
2				236.00	228.20	61.60	165.30	265.52	265.36	160.70	104.66
3				245.80	240.60	61.40	177.90	265.72	265.66	160.99	104.67
4				223.80	236.90	61.40	174.20	265.22	265.50	161.29	104.21
5				250.00	252.60	64.30	187.10	265.12	265.30	161.36	103.94
6				228.00	222.80	61.60	160.10	265.32	265.15	161.39	103.76
7				237.90	224.90	61.90	161.80	265.82	265.64	161.88	103.76
8				223.30	225.90	61.40	163.10	265.72	265.71	161.53	104.18
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

TOT	11617		44
AVG	11617	484	44	235.93	233.99	62.02	170.69	265.46	265.43	161.28	104.15

MAX	11617			250.00	252.60	64.30	187.10	265.82	265.71	161.88	104.67
MIN	11617			223.30	222.80	61.40	160.10	265.12	265.13	160.70	103.76