Grand Coulee Dam

May 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	Banks Lake Pump kcfs	Banks Lake Pump MWh	Banks Lake Elev
1	84404	3517	200	124.60	160.00	160.00	0.00	1252.00	1252.49	967.08	285.41	2.68	1968	1569.15
2	68412	2850	199	122.60	130.40	130.40	0.00	1251.60	1251.72	964.00	287.72	5.90	4406	1569.11
3	67539	2814	193	133.90	127.00	127.00	0.00	1251.60	1251.59	963.19	288.40	5.90	4400	1569.06
4	75067	3128	193	138.00	143.00	143.00	0.00	1251.30	1251.50	964.71	286.79	6.10	4548	1568.97
5	72371	3015	188	137.60	136.40	136.40	0.00	1251.20	1251.31	963.86	287.45	4.45	3311	1568.74
6	49875	2078	204	142.00	93.50	93.50	0.00	1252.50	1251.77	960.05	291.72	6.03	4503	1568.62
7	52155	2173	209	144.60	97.10	97.10	0.00	1253.70	1253.15	960.23	292.92	7.63	5592	1568.52
8	57375	2391	213	138.00	106.50	106.50	0.00	1254.40	1253.96	961.47	292.49	9.30	6794	1568.62
9	66349	2765	214	142.70	123.10	123.10	0.00	1254.70	1254.48	962.68	291.80	9.30	6805	1568.69
10	62710	2613	212	140.70	116.40	116.40	0.00	1255.10	1254.87	962.10	292.77	9.30	6828	1568.85
11	67122	2797	215	147.30	124.50	124.50	0.00	1255.50	1255.45	962.80	292.65	8.09	5929	1568.82
12	74010	3084	211	151.70	137.70	137.70	0.00	1255.80	1255.67	964.36	291.31	7.70	5640	1568.80
13	60582	2524	208	157.20	111.90	111.90	0.00	1256.90	1256.20	961.80	294.40	7.70	5640	1568.82
14	66609	2775	211	157.20	123.70	123.70	0.00	1257.60	1257.07	962.66	294.41	7.74	5653	1568.78
15	66704	2779	210	171.70	123.20	123.20	0.00	1258.82	1258.22	962.85	295.37	7.95	5771	1568.83
16	61044	2544	212	172.70	113.00	113.00	0.00	1260.30	1259.44	962.73	296.71	9.50	6864	1569.04
17	60672	2528	217	176.10	109.00	109.00	0.00	1261.90	1261.14	961.37	299.77	9.59	6882	1569.24
18	75731	3155	216	170.50	137.10	137.10	0.00	1262.70	1262.35	964.33	298.02	8.31	5985	1569.36
19	77873	3245	212	172.50	143.70	143.70	0.00	1263.30	1262.87	965.44	297.43	7.90	5688	1569.44
20	72797	3033	214	157.90	131.50	131.50	0.00	1263.90	1263.60	963.63	299.97	5.72	4018	1569.28
21	69709	2905	212	156.90	125.10	125.10	0.00	1264.60	1264.36	962.82	301.54	5.00	3479	1569.08
22	70658	2944	206	147.10	126.50	126.50	0.00	1265.10	1264.92	963.29	301.63	5.13	3575	1568.91
23	57518	2397	213	145.40	102.70	102.70	0.00	1266.00	1265.46	960.83	304.63	8.00	5712	1568.96
24	57149	2381	215	150.70	103.00	103.00	0.00	1267.10	1266.66	960.63	306.03	8.07	5712	1568.96
25	63003	2625	215	139.70	110.80	110.80	0.00	1267.70	1267.39	961.44	305.95	8.10	5713	1568.99
26	67406	2809	213	155.40	119.60	119.60	0.00	1268.50	1268.13	962.23	305.90	6.75	4829	1568.84
27	66144	2756	216	150.10	117.00	117.00	0.00	1269.30	1268.89	962.27	306.62	6.40	4536	1568.71
28	82886	3454	202	158.70	147.40	147.40	0.00	1269.30	1269.38	965.77	303.61	9.12	6437	1568.61
29				176.90	108.10	108.10	0.00	1271.00	1270.22	960.99	309.23			1568.95
30				190.30	114.00	114.00	0.00	1272.80	1271.93	961.19	310.74			1569.07
31				200.80	131.10	131.10	0.00	1274.40	1273.64	962.73	310.91			1569.20

TOT	1873874		5843
AVG	66924	2789	209	153.92	122.39	122.39	0.00	1260.67	1260.32	962.76	297.56	7.26	5258	1568.94

MAX	84404			200.80	160.00	160.00	0.00	1274.40	1273.64	967.08	310.91	9.59	6882	1569.44
MIN	49875			122.60	93.50	93.50	0.00	1251.20	1251.31	960.05	285.41	2.68	1968	1568.52