Benton County Watersheds Benton County is made up of 3 main watersheds or HUC 8 Units. Learn more about these watersheds at the links below; MPCA Watershed Page MPCA Watershed Health: WRAPS and TMDL's Benton County also has multiple subwatersheds. Learn more about some of these watersheds at the links below; Elk River Watershed Little Rock Creek Watershed
