The Castor River squeezes through Missouri's only known pink-granite shut-ins, creating cascades over exposed 1.5-billion-year-old rock. Missouri Department of Conservation provides a public trailhead and a one-mile loop to the formation.
Filed under roadside oddities: giant objects, odd monuments and things built for no clear reason.
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Source: mdc.mo.gov/discover-nature/places/natural-areas/castor-river-shut-ins