Pioneer Creek is located in the western metropolitan area on the west edge of Hennepin County. It flows out of Lake Independence between the cities of Medina and Independence and empties into Ox Yoke Lake in the city of Minnetrista. Ox Yoke Lake feeds Deer Creek which then enters into the South Fork Crow River. The South Fork Crow River is a tributary of mainstem Crow River which flows into the Mississippi River in the city of Dayton.Pioneer Creek near the outlet into Ox Yoke Lake, River Mile 10.6 was monitored by the Metropolitan Council from 1995 to 1999 as part of WOMP (Watershed Outlet Monitoring Program). Samples were collected at regular intervals for baseflow and also during storm events.