Bonneville Dam & Lake on Columbia River

May 2025

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	6371	265	96	227.20	229.20	65.90	150.90	73.10	73.30	18.70	54.60	18.60	5659	58.70
2	5713	238	96	232.40	222.40	58.40	151.60	74.40	73.80	18.30	55.50	18.20	5594	57.20
3	5271	220	96	205.50	215.50	53.40	149.70	73.30	74.10	18.00	56.10	17.90	5061	51.30
4	5160	215	96	217.50	213.50	52.30	148.80	73.50	73.50	17.70	55.80	17.60	5160	52.30
5	6762	282	96	239.70	230.70	69.10	149.10	74.40	73.90	18.50	55.40	18.40	6626	67.80
6	8091	337	96	233.70	246.70	85.30	149.00	73.10	73.50	19.40	54.10	19.30	8091	85.30
7	6330	264	96	222.50	227.50	66.50	148.60	72.70	72.80	18.70	54.10	18.50	6330	66.50
8	6234	260	96	228.00	226.00	65.00	148.50	72.50	72.70	18.30	54.40	18.20	6086	63.50
9	6766	282	96	239.50	232.50	70.60	149.50	73.60	73.40	18.70	54.70	18.60	6766	70.50
10	7488	312	96	238.80	240.80	78.80	149.50	73.40	73.30	19.30	54.00	19.10	7488	78.80
11	7503	313	96	250.90	240.90	78.30	150.20	74.50	73.70	19.30	54.40	19.20	7503	78.30
12	10102	421	96	263.30	271.30	108.30	150.60	73.60	74.00	21.00	53.00	20.70	8268	89.00
13				261.00	266.00	103.40	150.20	73.10	73.70	21.00	52.70	20.70		84.60
14				231.60	221.60	59.40	149.80	74.10	73.50	18.70	54.80	18.60		59.40
15				215.10	215.10	52.10	150.50	74.10	74.00	17.90	56.10	17.80		52.10
16				210.60	212.60	50.00	150.20	73.90	73.80	17.70	56.10	17.50		50.00
17				224.50	217.50	54.10	151.10	74.70	74.30	18.00	56.30	17.90		54.10
18				204.20	207.20	44.80	150.10	74.40	74.50	17.50	57.00	17.40		44.80
19				184.30	194.30	33.10	148.90	73.30	73.60	16.50	57.10	16.40		33.10
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TOT	81791		1152
AVG	6816	284	96	227.91	227.96	65.73	149.83	73.67	73.65	18.59	55.06	18.45	6553	63.02

MAX	10102			263.30	271.30	108.30	151.60	74.70	74.50	21.00	57.10	20.70	8268	89.00
MIN	5160			184.30	194.30	33.10	148.50	72.50	72.70	16.50	52.70	16.40	5061	33.10