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	17635	735	96	176.00	175.00	165.80	1.80	73.80	73.50	15.80	57.70	15.50	9017	85.60
14	17631	735	96	163.80	174.80	166.80	0.50	72.70	73.30	15.80	57.50	15.60	9064	86.50
15	17611	734	96	177.00	180.00	172.20	0.60	72.50	72.20	16.00	56.20	15.60	9351	91.70
16	17134	714	96	188.00	180.00	166.80	4.60	73.30	72.70	16.10	56.60	15.90	9381	91.40
17	17728	739	96	185.00	180.00	170.90	0.60	73.80	73.30	16.30	57.00	16.00	9370	90.40
18	17995	750	96	182.30	180.30	170.80	0.60	74.00	74.00	16.40	57.60	16.20	9421	90.00
19	17861	744	96	192.00	180.00	168.30	2.80	75.20	74.80	16.20	58.60	16.10	9432	88.60
20				182.50	185.50	164.90	11.70	75.00	75.30	16.40	58.90	16.30		86.30
21				185.50	204.50	173.80	21.80	73.00	73.80	17.50	56.30	17.30		92.60
22				183.30	194.30	175.00	10.30	71.90	72.20	17.20	55.00	17.00		93.70
23				197.60	177.60	165.50	3.20	73.80	72.80	16.30	56.50	16.20		85.00
24				189.60	188.60	172.10	7.60	74.00	74.00	16.90	57.10	16.70		91.00
25				205.90	194.90	169.20	16.90	75.10	74.70	17.60	57.10	17.50		89.30
26				193.50	204.50	182.00	12.40	74.00	74.70	18.00	56.70	17.90		102.40
27
28

TOT	328459		1824
AVG	17287	720	96	177.45	177.53	166.05	4.91	73.62	73.55	16.03	57.52	15.82	9099	88.47

MAX	17995			205.90	204.50	182.00	21.80	75.20	75.30	18.00	59.10	17.90	10515	102.40
MIN	14985			152.40	153.50	138.30	0.50	71.90	72.20	14.70	55.00	14.40	6400	59.90