Yamhill River - Course

Course

Formed by the confluence of the South Yamhill and North Yamhill rivers about 3 miles (4.8 km) east of McMinnville, the main stem Yamhill River flows generally east for about 11 miles (18 km) to the Willamette River, a tributary of the Columbia River. At about RM 9 (RK 14), Hawn Creek and then Millican Creek enter from the left as the Yamhill nears Lafayette, which lies to the river's left. Beyond Lafayette, Henry Creek enters from the left. Near Dayton, the river passes under Oregon Route 18 before skirting the city, which lies to its right at RM 5 (RK 8). Here Palmer Creek enters from the right. Below Dayton, the river enters the Willamette at its RM 55 (RK 89) south of Newberg.