Grand Coulee Dam

August 2026

Day of Month	Inflow kcfs	Total Outflow kcfs	Generation Flow kcfs	Spill kcfs	Midnight Reservoir Elevation	Average Forebay Elevation	Average Tailwater Elevation	Average Head feet	Banks Lake Elev
1	84.10	84.40	84.30	0.10	1284.30	1284.44	959.27	325.17	1568.75
2	88.80	79.10	79.00	0.10	1284.20	1284.36	958.32	326.04	1568.90
3	89.70	90.50	90.40	0.10	1284.00	1284.21	959.53	324.68	1569.01
4	85.60	91.80	91.70	0.10	1283.70	1284.03	959.50	324.53	1568.94
5	90.80	91.80	91.70	0.10	1283.70	1283.81	959.68	324.13	1568.53
6	86.90	94.60	94.50	0.10	1283.40	1283.62	960.23	323.39	1568.13
7	86.50	98.60	98.50	0.10	1283.00	1283.34	960.28	323.06	1567.91
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TOT
AVG	87.49	90.11	90.01	0.10	1283.76	1283.97	959.54	324.43	1568.60

MAX	90.80	98.60	98.50	0.10	1284.30	1284.44	960.28	326.04	1569.01
MIN	84.10	79.10	79.00	0.10	1283.00	1283.34	958.32	323.06	1567.91