Grand Coulee Daily Outflow in Thousands of CFS for Water Year 2026 Day Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 01 48.9 79.7 89.2 131.0 --- --- --- --- --- --- --- --- 02 59.3 78.1 76.8 123.8 --- --- --- --- --- --- --- --- 03 51.5 97.6 95.1 120.3 --- --- --- --- --- --- --- --- 04 42.9 91.3 102.7 102.1 --- --- --- --- --- --- --- --- 05 46.8 77.9 117.2 134.1 --- --- --- --- --- --- --- --- 06 71.3 72.3 101.6 147.3 --- --- --- --- --- --- --- --- 07 69.7 70.9 96.4 146.0 --- --- --- --- --- --- --- --- 08 73.2 79.9 94.1 139.6 --- --- --- --- --- --- --- --- 09 71.7 69.9 69.7 136.3 --- --- --- --- --- --- --- --- 10 55.7 69.2 59.7 133.8 --- --- --- --- --- --- --- --- 11 47.9 77.6 62.9 144.3 --- --- --- --- --- --- --- --- 12 57.8 81.1 60.2 137.8 --- --- --- --- --- --- --- --- 13 75.5 75.8 68.9 137.5 --- --- --- --- --- --- --- --- 14 75.3 71.0 89.8 147.2 --- --- --- --- --- --- --- --- 15 73.4 72.2 89.8 140.8 --- --- --- --- --- --- --- --- 16 67.9 81.7 97.1 147.1 --- --- --- --- --- --- --- --- 17 43.8 85.1 114.8 140.7 --- --- --- --- --- --- --- --- 18 65.7 99.3 101.5 146.9 --- --- --- --- --- --- --- --- 19 46.5 100.1 88.9 142.8 --- --- --- --- --- --- --- --- 20 60.6 94.2 112.0 140.8 --- --- --- --- --- --- --- --- 21 74.0 92.6 113.1 140.1 --- --- --- --- --- --- --- --- 22 66.8 86.3 123.9 131.9 --- --- --- --- --- --- --- --- 23 69.9 73.6 135.2 135.3 --- --- --- --- --- --- --- --- 24 75.9 91.0 124.1 142.4 --- --- --- --- --- --- --- --- 25 56.9 102.1 109.4 134.8 --- --- --- --- --- --- --- --- 26 50.9 78.3 124.0 138.0 --- --- --- --- --- --- --- --- 27 62.7 65.3 121.4 131.3 --- --- --- --- --- --- --- --- 28 67.1 68.2 121.0 --- --- --- --- --- --- --- --- --- 29 53.1 97.5 120.8 --- --- --- --- --- --- --- --- 30 73.1 93.6 136.1 --- --- --- --- --- --- --- --- 31 80.8 127.4 --- --- --- --- --- --- ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ VOL 3841 4906 6238 7327