Priest Rapids Dam & Reservoir

September 2026

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
1	12227	509	49	100.60	102.90	88.70	13.60	485.95	486.67	408.39	78.28
2	10492	437	45	74.80	77.40	74.70	2.20	485.21	485.56	406.20	79.36
3	11500	479	45	82.90	86.90	84.10	2.10	484.04	484.52	407.00	77.52
4	6594	275	39	53.80	47.30		1.10			402.97
5	7432	310	39	53.60	54.30	51.50	2.20	485.70	485.74	403.77	81.97
6	5996	250	37	42.60	43.70	41.10	2.00	485.37	485.21	402.57	82.64
7	6653	277	38	47.70	48.80	46.40	1.80	485.05	484.46	403.19	81.27
8	7723	322	41	55.70	56.00	54.20	1.10	484.99	484.94	403.91	81.03
9	8708	363	43	65.50	64.20	62.10	1.40	485.35	484.74	404.79	79.95
10	5944	248	41	49.60	43.30	40.50	2.20	487.10	485.43	402.54	82.89
11	5384	224	40	41.00	39.20	36.20	2.50	487.56	486.18	402.07	84.11
12	5269	220	39	34.20	38.40	35.20	2.60	486.45	486.48	401.97	84.51
13	5249	219	37	36.90	38.20	35.30	2.50	486.07	486.00	402.03	83.97
14				44.90	46.90	44.00	2.30	485.49	485.60	403.00	82.60
15				56.30	55.60	53.50	1.40	485.68	485.25	404.06	81.19
16				51.50	53.40	51.30	1.40	485.16	485.18	403.72	81.46
17				56.10	55.70	52.90	2.10	485.29	485.10	404.01	81.09
18				54.10	53.80	51.00	2.10	485.36	485.14	403.85	81.29
19				52.10	50.80	47.90	2.30	485.74	485.49	403.49	82.00
20				45.20	46.80	44.10	2.10	485.30	485.02	403.07	81.95
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TOT	99171		533
AVG	7629	318	41	54.96	55.18	52.35	2.55	485.62	485.41	403.83	81.53

MAX	12227			100.60	102.90	88.70	13.60	487.56	486.67	408.39	84.51
MIN	5249			34.20	38.20	35.20	1.10	484.04	484.46	401.97	77.52