Bonneville Dam & Lake on Columbia River

February 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	17813	742	96	173.80	172.80	168.80	0.60	74.40	74.00	15.80	58.20	15.60	10427	99.00
2	17841	743	96	173.30	172.30	168.30	0.60	74.50	74.10	15.70	58.40	15.60	10515	99.40
3	17857	744	96	167.90	171.90	167.90	0.60	74.00	74.10	15.50	58.60	15.30		98.20
4	17691	737	96	157.20	171.20	167.10	0.50	72.50	73.50	15.40	58.10	15.20	10204	96.70
5	17471	728	96	177.80	170.80	166.70	0.50	73.30	72.90	15.30	57.60	15.00	9237	88.40
6	17488	729	96	173.70	169.70	165.70	0.50	73.60	73.30	15.40	57.90	15.10	9197	87.30
7	17570	732	96	162.40	172.40	168.40	0.50	72.60	72.90	15.60	57.30	15.40	9327	89.60
8	17220	718	96	174.20	171.20	167.10	0.50	72.90	72.30	15.60	56.70	15.40	9102	88.40
9	14985	624	96	162.50	153.50	138.50	9.80	73.80	73.30	14.70	58.60	14.40	6400	59.90
10	15167	632	96	152.40	156.40	138.30	12.10	73.40	73.90	14.80	59.10	14.50	6548	61.00
11	16709	696	96	165.50	167.50	158.60	4.20	73.20	73.10	15.20	57.90	15.00	9257	88.00
12	17052	710	96	171.10	166.10	157.80	1.80	73.80	73.60	15.20	58.40	14.90	8529	79.90
13				176.00	175.00	165.80	1.80	73.80	73.50	15.80	57.70	15.50		85.60
14				163.80	174.80	166.80	0.50	72.70	73.30	15.80	57.50	15.60		86.50
15				177.00	180.00	172.20	0.60	72.50	72.20	16.00	56.20	15.60		91.70
16				188.00	180.00	166.80	4.60	73.30	72.70	16.10	56.60	15.90		91.40
17				185.00	180.00	170.90	0.60	73.80	73.30	16.30	57.00	16.00		90.40
18				182.30	180.30	170.80	0.60	74.00	74.00	16.40	57.60	16.20		90.00
19				192.00	180.00	168.30	2.80	75.20	74.80	16.20	58.60	16.10		88.60
20
21
22
23
24
25
26
27
28

TOT	204864		1152
AVG	17072	711	96	172.42	171.89	163.94	2.30	73.54	73.41	15.62	57.79	15.38	8977	87.37

MAX	17857			192.00	180.30	172.20	12.10	75.20	74.80	16.40	59.10	16.20	10515	99.40
MIN	14985			152.40	153.50	138.30	0.50	72.50	72.20	14.70	56.20	14.40	6400	59.90