Maximum discharge along the river is currently at the reporting a streamflow rate of cfs. This is also the highest stage along the South Yamhill River, with a gauge stage of ft at this location. This river is monitored from 1 different streamgauging stations along the South Yamhill River, the highest being situated at an altitude of ft, the .

The South Yamhill River is a tributary of the Yamhill River, located in western Oregon. It stretches for 57 miles, flowing from the Oregon Coast Range to join the Yamhill River near the town of McMinnville. The river has a rich history, with Native Americans using it for fishing and transport long before European settlers arrived. Today, the river is used for recreational activities such as fishing, kayaking, and camping. Several reservoirs and dams have been built along the river, including the Fernhill Reservoir and Dam, which provides irrigation water for agricultural purposes. The South Yamhill River is an important source of water for the region and supports a variety of plant and animal life, including salmon and steelhead trout.