St. Vrain Creek is a tributary of the South Platte River, approximately 32.2 miles long, in north central Colorado in the United States. It drains part of the foothills north of Boulder and the Colora

Ceran St. Vrain, born Ceran de Hault de Lassus de Saint-Vrain, was a French-American fur trader active in the American West during the 19th century. His father was a French aristocrat who emigrated to