Established in 1874, Grand County, Colorado lies in the north-central Rocky Mountains. It is named after the Grand River, an early name for the Colorado River. Encompassing 1,868 square miles, the area consists of meadows, river valleys and mountains. The Countyƒ??s major geographic feature is Middle Park, a large mountain basin that includes the headwaters of the Colorado River and the deepest natural lake in Colorado, Grand Lake. Explore Grand County’s unspoiled landscape and experience the wide variety of outdoor recreation opportunities all year around.