Johnson's Shut-Ins State Park is a public recreation area covering 9,432 acres (3,817 ha) on the East Fork Black River in Reynolds County, Missouri.

[5] The bedrock of the area is an erosion resistant rhyolite porphyry and dark colored diabase dikes of Proterozoic age.

Waters of the East Fork Black River became confined, or "shut-in", to a narrow channel following fractures and joints within the hard igneous rock.

Desloge assembled most of the park, including the shut-ins and two miles of river frontage, over a period of 17 years, then donated it to the state in 1955.

On December 14, 2005, the park was devastated by a catastrophic flood caused by the failure of the Taum Sauk pumped storage plant reservoir atop a neighboring mountain.

[11] The park partly reopened in the summer of 2006 for limited day use, but due to dangerous conditions, swimming in the river and exploring the rock formations was prohibited.