Willowbrook Amphitheatre, also called Chief Colorow's Cave, is a cave-like rock formation in Jefferson County, Colorado, near Morrison. Created in Paleozoic-age Fountain Formation sandstone, its open top makes it a natural amphitheatre rather than a fully enclosed cave. The site sits in the Willowbrook subdivision south of Red Rocks Park and Red Rocks Amphitheatre. By local association, Chief Colorow and his band are said to have used it as temporary shelter during summer visits. It now stands on private land reserved for Willowbrook residents and serves as a setting for weddings and community events.