 Coombs Creek enters from the left about below that, and then the river, turning north, flows by Echo and under I-84 again.The Umatilla reaches Stanfield about from the mouth, then passes under Oregon Route 207 and receives Butter Creek from the left.Reaching Hermiston at about RM 9 (RK 14), the river flows by a United States Geological Survey (USGS) stream gauge about from the mouth, then passes under Interstate 82 and Oregon Route 730 before entering the Columbia River at Umatilla.