Bonneville Dam & Lake on Columbia River

March 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	18081	753	96	185.20	186.20	176.80	1.20	73.10	73.50	16.50	57.00	16.30	10632	104.80
2				189.30	190.30	181.20	1.30	73.00	73.20	16.80	56.40	16.60		108.00
3				186.20	178.20	169.10	1.30	73.90	73.20	16.10	57.10	15.90		103.50
4				180.20	176.20	167.00	1.30	74.30	74.20	15.90	58.30	15.80		100.40
5				180.50	181.50	172.40	1.30	74.20	74.10	16.20	57.90	16.00		114.30
6				180.90	173.90	164.60	1.40	74.90	74.50	15.70	58.80	15.60		90.30
7				178.20	175.20	166.10	1.30	75.10	75.00	15.60	59.40	15.50		97.90
8								75.00
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

TOT	18081		96
AVG	18081	753	96	182.93	180.21	171.03	1.30	74.19	73.96	16.11	57.84	15.96	10632	102.74

MAX	18081			189.30	190.30	181.20	1.40	75.10	75.00	16.80	59.40	16.60	10632	114.30
MIN	18081			178.20	173.90	164.60	1.20	73.00	73.20	15.60	56.40	15.50	10632	90.30