Bonneville Dam & Lake on Columbia River

January 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	Project Average Tailwater	2nd Powerhouse Total MWh	2nd Powerhouse Flow kcfs
1	20230	843	96	192.90	205.90	201.90	0.50	72.90	73.40	17.90	55.50	17.70	13371	134.20
2	19502	813	96	200.10	201.10	197.10	0.50	72.80	72.60	17.80	54.80	17.60	12985	132.10
3	19416	809	96	201.30	201.30	197.30	0.50	72.70	72.40	17.90	54.50	17.70	13014	133.10
4	19073	795	96	196.70	196.70	192.70	0.50	72.80	72.60	17.90	54.70	17.70	12674	128.90
5	19422	809	96	203.00	205.00	201.00	0.50	72.50	72.20	18.50	53.70	18.30	13196	137.50
6	19681	820	96	207.10	206.10	202.10	0.50	72.60	72.60	18.40	54.20	18.20	13179	136.10
7	19558	815	96	207.50	201.50	197.60	0.50	73.20	73.00	18.20	54.80	18.00	12914	131.20
8	19785	824	96	205.60	203.60	199.70	0.50	73.40	73.30	18.40	54.90	18.20	13273	134.90
9	20444	852	96	203.80	211.80	207.80	0.50	72.60	73.20	18.50	54.70	18.30	13478	137.70
10	20297	846	96	214.30	213.30	209.40	0.50	72.70	72.50	18.50	54.00	18.30	13396	139.00
11	20430	851	96	212.20	214.20	210.20	0.50	72.50	72.70	18.50	54.20	18.30	13276	137.10
12	19667	819	96	212.50	200.50	196.50	0.50	73.80	73.20	17.70	55.50	17.50	12693	127.40
13	19250	802	96	203.90	189.90	185.90	0.50	75.20	74.30	16.90	57.40	16.70	12606	122.20
14	20672	861	96	200.40	202.40	198.40	0.50	74.80	75.10	17.50	57.60	17.30	12741	122.90
15	20079	837	96	201.20	193.20	189.20	0.50	75.60	75.60	16.90	58.70	16.80	12557	119.00
16	21203	883	96	206.70	208.70	200.40	3.50	75.50	75.80	17.40	58.40	17.20	12708	120.60
17	21149	881	96	205.60	219.60	205.30	5.80	74.10	74.60	18.40	56.20	18.20	12580	124.10
18	20825	868	96	198.60	213.60	206.90	0.50	72.50	73.20	18.40	54.80	18.20	12518	127.40
19	17954	748	96	209.60	200.60	176.90	17.50	73.40	73.10	17.20	55.90	17.10	9781	97.70
20				203.30	197.30	184.50	7.80	74.10	74.30	17.00	57.30	16.70		107.80
21				200.40	202.40	179.30	16.90	74.00	74.30	17.30	57.00	17.10		107.50
22				211.30	201.30	182.70	12.50	74.90	74.30	17.50	56.80	17.30		106.50
23				209.90	205.90	188.70	10.20	75.30	75.00	17.70	57.30	17.60		108.80
24				201.00	208.00	195.90	3.50	74.60	74.60	17.80	56.80	17.60		116.20
25				201.60	203.60	194.50	0.60	74.40	74.40	17.50	56.90	17.30		115.20
26				196.00	189.00	182.20	0.60	75.10	74.70	16.60	58.10	16.50		110.60
27
28
29
30
31

TOT	378637		1824
AVG	19928	830	96	204.10	203.71	195.54	3.34	73.77	73.73	17.78	55.95	17.59	12786	123.68

MAX	21203			214.30	219.60	210.20	17.50	75.60	75.80	18.50	58.70	18.30	13478	139.00
MIN	17954			192.90	189.00	176.90	0.50	72.50	72.20	16.60	53.70	16.50	9781	97.70