Lower Granite Dam & Lake

December 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	Midnight Lewiston Gage ft
1	4045	169	48	20.40	24.30	23.80	0.00	735.90	736.55	636.57	99.98	736.15
2	2755	115	48	17.70	16.10	15.70	0.00	736.38	736.33	636.30	100.03	736.49
3	3071	128	48	17.70	18.10	17.50	0.00	736.28	736.32	636.30	100.02	736.40
4	3434	143	48	18.70	20.10	19.70	0.00	735.92	736.00	636.01	99.99	735.95
5	3650	152	48	18.00	21.40	20.90	0.00	735.07	735.41	635.53	99.88	735.47
6	3095	129	47	18.60	18.10	17.70	0.00	735.19	735.20	635.63	99.57	735.49
7	3187	133	47	21.20	18.60	18.20	0.00	735.85	735.49	635.37	100.12	736.00
8	4843	202	47	21.10	28.30	27.70	0.00	734.07	735.42	635.17	100.25	735.16
9	4279	178	47	23.20	25.10	24.60	0.00	733.60	733.79	634.16	99.63	733.95
10	6757	282	46	38.50	39.40	39.00	0.00	733.38	733.67	634.29	99.38	733.83
11	7260	302	46	43.00	42.30	41.70	0.00	733.56	733.83	634.14	99.69	734.10
12	7898	329	46	48.00	45.80	45.30	0.00	734.11	733.63	633.69	99.94	734.08
13	8309	346	47	49.40	47.60	47.20	0.00	734.57	734.65	633.67	100.98	734.79
14				39.40	43.40	42.90	0.00	733.57	734.42	633.69	100.73	734.43
15				36.90	31.00	30.50	0.00	735.04	734.43	633.53	100.90	735.16
16				34.70	36.20	35.70	0.00	734.67	734.96	633.82	101.14	735.11
17				35.50	32.40	29.50	2.50	735.44	735.53	634.20	101.33	735.83
18				40.20	46.00	45.60	0.00	734.00	735.30	634.25	101.05	735.12
19				45.00	40.10	39.60	0.00	735.20	734.64	634.48	100.16	735.40
20				50.60	46.70	46.30	0.00	736.17	735.92	635.95	99.97	735.40
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TOT	62583		613
AVG	4814	201	47	31.89	32.05	31.45	0.12	734.90	735.07	634.84	100.24	735.22

MAX	8309			50.60	47.60	47.20	2.50	736.38	736.55	636.57	101.33	736.49
MIN	2755			17.70	16.10	15.70	0.00	733.38	733.63	633.53	99.38	733.83