Tarryall Creek is a tributary of the South Platte River, approximately 68.5 miles long, in Park County in central Colorado in the United States. It drains a rural portion of north and central South Park, an intermontane grassland in the Rocky Mountains southwest of Denver. It rises in the high Rockies in several forks along the Continental Divide in the Pike Natiā¦Tarryall Creek is a tributary of the South Platte River, approximately 68.5 miles long, in Park County in central Colorado in the United States. It drains a rural portion of north and central South Park, an intermontane grassland in the Rocky Mountains southwest of Denver. It rises in the high Rockies in several forks along the Continental Divide in the Pike National Forest southwest of Boreas Pass. It descends to the southwest through a short canyon, emerging into South Park near Como, Colorado. It crosses U.S. Highway 285 east of Red Hill Pass northeast of Fairplay, the county seat of Park County, then meanders towards the southeast, joining the South Platte from the east in the southeastern corner of South Park.