Bonneville Dam & Lake on Columbia River

January 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	12467	519	96	113.60	113.60	108.00	0.60	75.70	75.50	12.70	62.80	12.30	2630	22.80
2	13811	575	96	122.40	126.40	120.80	0.60	75.30	74.90	12.60	62.30	12.20	3857	33.70
3	14590	608	96	138.20	133.20	127.60	0.60	76.00	75.30	13.20	62.10	12.80	4890	43.00
4	14616	609	96	124.20	133.20	127.60	0.60	75.10	75.40	12.70	62.70	12.40	6054	52.90
5	13624	568	96	117.10	126.10	120.50	0.60	74.20	74.20	12.50	61.70	12.20	5009	44.30
6	13313	555	96	135.00	123.00	117.50	0.50	75.30	74.40	12.50	61.90	12.20	4020	35.40
7	13239	552	96	116.80	121.80	116.20	0.50	74.80	74.60	12.50	62.10	12.10	4150	36.40
8	12922	538	96	119.50	119.50	114.00	0.50	74.90	74.40	12.50	61.90	12.20	3740	33.00
9	14916	622	96	133.40	140.40	134.80	0.60	73.70	74.40	13.60	60.80	13.30	5837	52.90
10	14033	585	96	140.80	131.80	126.20	0.60	74.60	74.00	13.20	60.80	13.00	5215	46.90
11	15063	628	96	146.30	141.30	135.70	0.60	75.10	74.30	13.60	60.70	13.30	5821	52.20
12	14649	610	96	140.50	134.50	128.90	0.60	75.70	75.10	12.90	62.20	12.60	6026	53.00
13	14055	586	96	127.70	128.70	123.10	0.60	75.60	75.20	12.80	62.40	12.60	5674	49.70
14	13869	578	96	124.80	126.80	121.10	0.60	75.30	75.10	12.60	62.50	12.30	4823	42.10
15	14552	606	96	130.70	134.70	129.20	0.60	75.00	74.90	13.30	61.60	12.90	5075	44.90
16	14520	605	96	139.60	134.60	129.10	0.50	75.20	74.90	13.30	61.60	13.10	5241	46.50
17	13521	563	96	119.40	124.40	118.80	0.60	74.90	74.80	12.60	62.20	12.30	4894	43.00
18	14928	622	96	138.40	140.40	134.90	0.60	74.80	74.20	13.60	60.60	13.30	5928	53.50
19	14452	602	96	137.60	135.60	130.00	0.60	75.10	74.20	13.40	60.80	13.20	5943	53.50
20	15692	654	96	144.40	147.40	141.80	0.60	74.70	74.50	13.90	60.60	13.60	7091	64.20
21				133.40	136.40	130.80	0.60	74.40	74.10	13.40	60.70	13.10		47.30
22				129.60	125.60	119.90	0.70	74.70	74.30	12.80	61.50	12.50		40.50
23				143.60	139.60	134.00	0.60	75.10	74.50	13.40	61.10	13.00		50.50
24				125.50	128.50	122.80	0.60	74.80	74.40	12.60	61.80	12.30		45.80
25				131.50	130.50	124.90	0.60	75.00	74.30	12.50	61.80	12.20		44.20
26				124.00	131.00	125.40	0.60	74.20	73.90	12.50	61.40	12.10		42.20
27				123.80	131.80	126.20	0.60	73.30	73.20	12.60	60.60	12.10		36.30
28
29
30
31

TOT	282832		1920
AVG	14142	589	96	130.44	131.14	125.55	0.59	74.91	74.56	12.96	61.60	12.64	5096	44.84

MAX	15692			146.30	147.40	141.80	0.70	76.00	75.50	13.90	62.80	13.60	7091	64.20
MIN	12467			113.60	113.60	108.00	0.50	73.30	73.20	12.50	60.60	12.10	2630	22.80