Grand Coulee Daily Inflow in Thousands of CFS for Water Year 2026 Day Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 01 73.0 71.2 84.4 104.3 109.6 --- 117.5 124.6 187.1 144.6 84.1 72.4 02 69.5 66.4 82.4 108.7 107.3 91.2 119.2 122.6 193.1 153.1 88.8 73.6 03 71.2 79.9 91.7 122.7 101.3 90.9 118.5 133.9 183.6 148.9 89.7 --- 04 61.9 77.6 94.7 124.4 107.7 95.4 119.2 138.0 187.9 145.1 85.6 --- 05 66.8 70.7 85.9 130.5 104.8 95.1 114.8 137.6 182.7 144.3 90.8 --- 06 65.2 83.5 85.8 125.4 100.1 93.5 113.6 142.0 183.8 137.6 86.9 --- 07 66.5 80.1 90.1 139.0 100.5 96.5 112.2 144.6 187.4 132.9 86.5 --- 08 65.9 78.2 83.2 123.8 100.7 96.7 113.3 138.0 181.9 118.7 86.2 --- 09 68.3 79.6 93.6 138.8 103.5 99.8 109.8 142.7 173.2 123.2 86.3 --- 10 67.1 78.1 89.7 142.1 104.6 92.0 110.7 140.7 166.8 123.5 89.2 --- 11 62.1 75.2 82.8 139.1 103.5 90.2 121.1 147.3 157.9 110.9 82.1 --- 12 76.4 77.1 81.3 126.0 102.3 104.3 117.7 151.7 147.9 105.9 87.7 --- 13 70.5 70.9 86.1 129.4 105.1 105.5 120.8 157.2 146.9 104.4 85.4 --- 14 73.1 73.4 97.8 127.9 102.1 97.5 122.0 157.2 142.2 101.9 83.2 --- 15 66.0 76.7 91.0 129.3 104.5 101.8 124.8 171.7 142.8 104.2 81.2 --- 16 68.1 78.5 109.5 120.4 106.9 102.3 117.9 172.7 153.9 89.2 80.0 --- 17 70.8 82.3 117.0 131.4 112.9 103.4 122.9 176.1 154.6 97.4 78.6 --- 18 71.3 89.6 118.5 131.3 118.4 103.4 121.0 170.5 147.0 87.7 80.9 --- 19 67.9 92.0 125.4 130.0 120.8 97.7 125.1 172.5 149.7 93.3 83.5 --- 20 68.2 84.2 121.0 132.9 126.3 113.1 124.9 157.9 131.1 95.2 86.0 --- 21 70.4 88.2 114.8 135.4 116.7 113.9 124.2 156.9 110.9 92.9 81.4 --- 22 72.5 88.7 118.6 124.0 115.7 126.9 128.7 147.1 162.5 98.0 78.1 --- 23 75.6 77.2 120.6 127.6 107.5 131.8 133.1 145.4 138.2 95.4 80.4 --- 24 68.3 82.6 109.1 126.6 113.5 124.3 140.7 150.7 134.8 92.0 81.1 --- 25 71.0 79.3 101.4 130.8 107.8 119.3 134.2 139.7 141.4 84.0 80.4 --- 26 71.8 75.5 107.5 119.1 100.7 145.8 137.6 155.4 146.5 95.3 77.5 --- 27 74.4 78.1 120.6 121.1 108.2 136.9 131.1 150.1 127.2 92.4 77.3 --- 28 75.3 73.8 130.7 112.4 103.4 136.9 130.1 158.7 126.1 84.6 80.4 --- 29 64.5 79.9 118.0 119.7 127.0 131.6 176.9 131.3 92.8 75.9 --- 30 71.9 82.8 113.1 110.6 119.4 120.8 190.3 133.9 89.3 69.6 --- 31 71.4 107.8 104.9 121.3 200.8 99.0 76.5 --- ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ ------ VOL 4278 4703 6296 7715 5983 6493 7297 9464 9232 6700 5080 290