Bonneville Dam & Lake on Columbia River

May 2023

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	6236	260	96	222.40	224.40	62.80	149.20	74.50	74.50	18.10	56.40	18.10	6236	62.70
2	9838	410	96	259.50	265.50	104.30	148.90	73.90	74.20	20.60	53.60	20.50	8899	94.50
3	13305	554	96	305.20	309.20	149.00	147.80	73.50	73.50	23.10	50.40	22.70	8926	101.00
4	14937	622	96	347.40	330.40	169.50	148.50	75.20	74.10	24.50	49.60	23.90	8693	100.10
5	15666	653	96	330.10	340.10	178.30	149.40	74.20	74.60	25.20	49.40	24.60	8709	100.60
6	16603	692	96	354.30	356.30	195.30	148.60	74.00	74.10	25.80	48.30	25.20	9095	108.50
7	16864	703	96	366.30	361.30	200.10	148.80	74.60	74.10	26.20	47.90	25.60	9351	112.70
8	16275	678	96	351.00	351.00	189.70	148.80	74.60	74.40	25.80	48.60	25.20	8548	100.80
9	16431	685	96	358.90	350.90	188.50	150.00	75.40	75.20	25.70	49.50	25.10	8380	97.30
10	16920	705	96	350.60	360.60	198.90	149.30	74.00	74.50	26.10	48.40	25.50	9149	109.00
11	16272	678	96	350.30	353.30	191.50	149.40	73.40	74.10	25.70	48.40	25.10	8823	105.60
12	14689	612	96	335.60	330.60	169.20	149.00	74.10	73.70	24.70	49.00	24.10	8278	97.00
13	14895	621	96	327.20	332.20	171.10	148.70	73.50	73.50	24.40	49.10	23.90	8261	96.70
14	15483	645	96	344.60	341.60	181.00	148.20	73.80	73.10	24.80	48.30	24.30	8752	104.10
15	16775	699	96	361.30	363.30	201.70	149.20	73.60	73.40	25.80	47.60	25.20	9384	114.70
16	17733	739	96	400.60	398.60	225.30	160.90	73.60	73.50	27.60	45.90	27.00	9797	125.60
17	17601	733	96	426.20	426.20	233.20	180.60	73.70	73.70	29.00	44.70	28.20	9387	124.00
18	12515	521	96	422.30	424.30	165.60	246.30	73.60	73.60	29.00	44.60	28.50	6209	83.00
19	15773	657	96	423.60	425.60	209.80	203.40	73.20	73.50	29.10	44.40	28.50	9239	123.60
20	17346	723	96	434.00	420.00	227.90	179.70	74.60	73.60	28.90	44.70	28.20	9455	124.90
21				418.80	421.80	212.30	197.20	74.50	74.70	29.00	45.70	28.20		108.60
22				427.50	432.50	209.90	210.20	74.10	74.20	29.40	44.80	28.70		104.50
23				421.70	421.70	216.00	193.30	74.00	73.60	28.90	44.70	28.30		110.60
24				400.90	394.90	216.60	166.00	74.30	74.30	27.80	46.50	27.10		114.30
25				371.60	369.60	206.00	151.20	74.80	74.50	26.40	48.10	25.80		115.20
26				338.90	348.90	187.10	149.30	74.00	73.90	25.30	48.60	24.70		103.10
27				301.90	290.90	127.50	151.10	75.00	74.20	22.50	51.70	22.30		95.30
28
29
30
31

TOT	302157		1920
AVG	15108	629	96	361.21	360.95	184.74	163.81	74.14	74.01	25.90	48.11	25.35	8679	105.11

MAX	17733			434.00	432.50	233.20	246.30	75.40	75.20	29.40	56.40	28.70	9797	125.60
MIN	6236			222.40	224.40	62.80	147.80	73.20	73.10	18.10	44.40	18.10	6209	62.70