Bonneville Dam & Lake on Columbia River

August 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	5865	244	96	120.80	113.80	51.10	50.20	75.60	75.10	10.60	64.50	10.50	5865	51.10
2	6183	258	96	109.70	116.70	54.00	50.30	75.00	75.00	10.70	64.30	10.70	6183	54.00
3	5056	211	96	106.70	106.70	44.10	50.20	75.00	74.70	9.90	64.80	9.80	5056	44.10
4	4296	179	96	99.80	99.80	37.10	50.30	75.00	74.80	9.20	65.60	9.10	4190	36.80
5	5580	232	96	111.20	111.20	48.70	50.20	74.80	74.90	10.10	64.80	10.00	4983	43.50
6	6409	267	96	124.10	119.10	56.20	50.50	75.40	75.30	10.90	64.40	10.80	4611	40.60
7	6648	277	96	126.40	121.40	58.70	50.40	76.00	75.10	11.20	63.90	11.10	4631	41.00
8	6716	280	96	117.80	121.80	59.20	50.20	75.50	74.90	11.30	63.60	11.30	5203	46.00
9	8031	335	96	129.30	134.30	72.10	49.80	75.20	74.20	12.10	62.10	12.10	4781	43.40
10	6920	288	96	127.60	123.60	61.20	50.10	75.30	74.90	11.40	63.50	11.40	5003	44.40
11	8350	348	96	137.10	137.10	74.70	50.00	75.40	74.70	12.30	62.40	12.40	5921	53.30
12	9018	376	96	139.80	143.80	81.60	49.80	75.10	74.30	13.00	61.30	13.10	6362	57.90
13	7841	327	96	129.80	132.80	70.60	49.90	74.60	74.30	12.30	62.00	12.40	6017	54.40
14	7270	303	96	126.70	127.70	65.50	49.70	74.50	73.90	11.80	62.10	11.90	6238	56.40
15	5315	221	96	111.00	109.00	46.50	50.10	74.90	74.40	10.30	64.10	10.30	5149	45.10
16	6481	270	96	114.80	119.80	57.50	50.00	74.40	74.30	11.10	63.20	11.10	6138	54.40
17	5113	213	96	109.10	107.10	44.80	49.90	74.60	74.10	10.20	63.90	10.10	5113	44.80
18	6508	271	96	123.70	119.70	57.30	50.10	74.90	74.50	10.90	63.60	10.90	5656	49.80
19	6619	276	96	121.90	120.90	58.30	50.10	75.10	74.80	11.20	63.60	11.20	5873	51.80
20	5489	229	96	109.50	109.50	48.10	49.00	75.10	74.70	10.50	64.20	10.50	5477	48.00
21	6306	263	96	121.00	117.00	55.70	48.90	75.40	75.00	10.90	64.10	10.90	6306	54.30
22	6768	282	96	122.00	121.00	59.60	49.00	75.50	74.80	11.20	63.60	11.20	5897	52.00
23	7101	296	96	122.40	124.40	62.90	49.10	75.40	75.00	11.40	63.60	11.40	5092	45.60
24	5701	238	96	108.30	111.30	50.00	49.00	75.00	74.70	10.80	63.90	10.80	5379	47.20
25	4937	206	96	106.70	104.70	43.20	49.10	75.20	74.80	10.20	64.60	10.10	4937	43.20
26	6706	279	96	122.40	121.40	59.70	49.40	75.30	75.20	11.10	64.10	11.10	6386	56.90
27				130.00	132.00	70.40	49.20	75.10	74.80	12.00	62.80	12.00		70.40
28				135.40	132.40	70.80	49.20	75.40	74.90	12.00	62.90	12.00		70.80
29				126.60	123.60	61.90	49.30	75.80	75.10	11.40	63.70	11.40		61.90
30				108.70	106.70	44.90	49.40	76.00	75.40	10.00	65.40	9.90		44.90
31				105.10	112.10	50.30	49.40	75.20	75.30	10.20	65.10	10.10		50.30

TOT	167227		2496
AVG	6432	268	96	119.53	119.43	57.31	49.74	75.18	74.77	11.04	63.73	11.02	5479	50.27

MAX	9018			139.80	143.80	81.60	50.50	76.00	75.40	13.00	65.60	13.10	6386	70.80
MIN	4296			99.80	99.80	37.10	48.90	74.40	73.90	9.20	61.30	9.10	4190	36.80