Bonneville Dam & Lake on Columbia River

April 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	17730	739	96	243.00	242.00	191.40	38.20	73.00	72.90	20.60	52.30	20.40	12311	134.10
2	18073	753	96	223.10	207.10	183.50	11.20	74.70	73.80	18.70	55.10	18.60	12510	128.90
3	18781	783	96	193.80	197.80	183.90	1.50	74.30	74.40	17.60	56.80	17.50	12795	128.10
4	18262	761	96	198.20	188.20	174.30	1.50	75.20	74.80	16.60	58.20	16.50	12207	118.90
5	19400	808	96	203.50	201.50	183.90	5.20	75.50	75.70	17.10	58.60	17.00	13251	128.30
6	19261	803	96	205.60	202.60	184.10	6.20	75.70	75.50	17.30	58.20	17.10	13043	127.20
7	18076	753	96	173.80	184.80	170.40	2.00	74.70	75.10	16.30	58.80	16.20	11860	114.10
8	17412	726	96	174.70	183.70	166.30	4.90	73.80	74.10	16.10	58.00	16.00	11270	109.80
9	18816	784	96	189.70	198.70	184.70	1.60	73.30	73.80	17.10	56.70	17.00	12714	127.60
10	5784	241	96	218.60	220.60	60.20	148.00	72.80	73.00	18.40	54.60	18.30	5770	60.00
11	5420	226	96	218.30	217.30	56.60	148.20	72.90	72.70	18.40	54.30	18.30	5420	56.60
12	6837	285	96	235.80	233.80	72.40	149.00	73.10	73.20	19.30	53.90	19.20	6837	72.40
13	8190	341	96	245.00	250.00	87.90	149.70	72.60	73.70	20.00	53.70	19.90	8190	87.90
14	9165	382	96	276.00	261.00	99.30	149.30	74.00	73.30	20.60	52.70	20.40	7325	80.30
15	8830	368	96	252.50	256.50	92.80	151.30	73.60	74.10	20.60	53.50	20.30	5673	60.30
16	8845	369	96	269.20	255.20	92.30	150.60	75.10	74.50	20.50	54.00	20.30	5579	58.90
17	9630	401	96	246.50	262.50	99.50	150.60	73.20	74.90	20.70	54.20	20.50	5547	58.10
18	6716	280	96	232.00	231.00	69.80	148.80	73.50	73.50	19.10	54.40	19.00	5197	54.10
19	5885	245	96	220.50	222.50	60.50	149.60	73.30	73.20	18.50	54.70	18.30	5110	52.70
20	6228	260	96	232.30	226.30	63.70	150.10	74.00	73.60	18.50	55.10	18.30	5754	59.00
21	7095	296	96	239.70	235.70	72.70	150.50	74.50	73.90	18.90	55.00	18.80	5573	57.40
22	3839	160	96	196.20	201.20	38.30	150.60	73.90	74.00	17.20	56.80	17.00	3698	36.90
23	4997	208	96	213.20	213.20	50.00	150.80	73.90	74.10	17.50	56.60	17.40	4833	48.30
24	4505	188	96	207.80	207.80	44.90	150.50	73.90	73.90	17.30	56.60	17.10	4505	44.90
25	4643	193	96	206.20	209.20	46.50	150.40	73.50	73.80	17.50	56.30	17.30	4643	46.50
26	4053	169	96	205.00	203.00	40.70	149.80	73.80	73.40	17.30	56.10	17.20	4053	40.70
27	3319	138	96	190.20	195.20	33.10	149.60	73.30	73.30	16.80	56.50	16.70	3319	33.10
28	3305	138	96	193.10	195.10	33.20	149.50	73.00	72.90	16.80	56.10	16.60	3305	33.20
29	3303	138	96	192.80	195.80	33.20	150.20	72.80	72.90	16.80	56.10	16.60	3303	33.20
30	4887	204	96	219.10	213.10	49.90	150.80	73.40	73.30	17.70	55.60	17.50	4341	44.30

TOT	291287		2880
AVG	9710	405	96	217.18	217.08	97.33	107.34	73.81	73.84	18.19	55.65	18.04	7331	74.53

MAX	19400			276.00	262.50	191.40	151.30	75.70	75.70	20.70	58.80	20.50	13251	134.10
MIN	3303			173.80	183.70	33.10	1.50	72.60	72.70	16.10	52.30	16.00	3303	33.10