Bonneville Dam & Lake on Columbia River

July 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	8554	356	96	194.00	189.00	80.60	95.90	75.60	75.20	16.30	58.90	16.30	8206	77.40
2	8091	337	96	188.40	184.40	75.70	96.20	76.00	75.60	16.00	59.60	16.00	7763	72.70
3	6973	291	96	167.10	173.10	64.30	96.30	75.40	75.60	15.40	60.20	15.40	6973	64.30
4	6811	284	96	168.50	171.50	63.40	95.80	75.20	75.10	15.30	59.80	15.30	6811	63.40
5	5262	219	96	160.00	156.00	47.80	95.80	75.50	75.10	14.10	61.00	14.10	5262	47.80
6				169.30	173.30	64.90	95.90	75.10	75.20	15.00	60.20	15.10		64.90
7				167.60	164.60	57.10	95.20	75.40	75.30	14.70	60.60	14.70		57.10
8				139.30	139.30	32.40	94.50	75.30	75.20	13.10	62.10	13.10		32.40
9				143.60	137.60	30.90	94.30	76.00	75.00	12.60	62.40	12.60		30.90
10				142.90	145.90	38.50	95.00	75.70	75.80	13.30	62.50	13.30		38.50
11				138.40	138.40	31.30	94.80	75.60	75.50	12.80	62.70	12.90		31.30
12				129.00	131.00	31.40	87.20	75.50	75.20	12.40	62.80	12.40		31.40
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31

TOT	35691		480
AVG	7138	297	96	159.01	158.67	51.52	94.74	75.52	75.32	14.25	61.07	14.27	7003	51.01

MAX	8554			194.00	189.00	80.60	96.30	76.00	75.80	16.30	62.80	16.30	8206	77.40
MIN	5262			129.00	131.00	30.90	87.20	75.10	75.00	12.40	58.90	12.40	5262	30.90