Big Dry Creek is a tributary that joins the South Platte River near Fort Lupton, Colorado. It rises in Jefferson County, Colorado at the mouth of at an elevation of 8,000 feet (2,400 m). The creek flows through Jefferson, Adams, and Weld counties. In Jefferson County, it flows into and out of Standley Lake. It receives treated wastewater from several municipalities, including the City and County of Broomfield, Westminster, Thornton and Northglenn. The Big Dry Creek Trail, a recreation trail, roughly follows the creek from Standley Lake Regional Park to Interstate 25.