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	45.60	1.10	485.89	484.75	402.97	81.78
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	6410	267	38	44.90	46.90	44.00	2.30	485.49	485.60	403.00	82.60
15	7684	320	40	56.30	55.60	53.50	1.40	485.68	485.25	404.06	81.19
16	7399	308	40	51.50	53.40	51.30	1.40	485.16	485.18	403.72	81.46
17	7566	315	40	56.10	55.70	52.90	2.10	485.29	485.10	404.01	81.09
18	7384	308	41	54.10	53.80	51.00	2.10	485.36	485.14	403.85	81.29
19	6979	291	41	52.10	50.80	47.90	2.30	485.74	485.49	403.49	82.00
20	6443	268	40	45.20	46.80	44.10	2.10	485.30	485.02	403.07	81.95
21	8371	349	42	58.90	60.30	58.50	1.20	484.89	484.78	404.57	80.21
22	6706	279	40	45.40	48.20	46.30	1.40	484.06	484.21	403.22	80.99
23	7306	304	37	55.90	52.70	51.10	1.00	484.97	484.02	403.70	80.32
24	8745	364	35	66.00	63.40	61.40	1.20	485.71	485.26	404.81	80.45
25	6348	264	37	47.00	45.60	42.70	2.40	486.09	485.77	402.98	82.79
26	7585	316	36	56.80	54.90	51.70	2.50	486.60	486.26	403.92	82.34
27	10353	431	40	72.60	76.40	73.20	2.50	485.54	486.12	406.23	79.89
28	11594	483	43	85.30	86.40	84.70	1.00	485.23	484.96	407.23	77.73
29	7783	324	38	55.00	55.50	53.90	0.90	485.07	484.99	404.10	80.89
30	7634	318	40	55.10	54.50	53.00	0.90	485.25	485.01	403.88	81.13

TOT	231461		1201
AVG	7715	321	40	56.57	56.72	53.89	2.20	485.54	485.29	404.04	81.25

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	0.90	484.04	484.02	401.97	77.52