The state Department of Environmental Quality ordered a temporary halt to gravel mining Tuesday along a portion of Crooked Creek in Marion County.
The department said temperatures of the water in the creek had become too high for this time of year, apparently because of the removal of trees and other plants long the stream banks during mining operations.
Excessive heat can hurt fish and plant life in the stream, the agency said.
The directive applies to in-stream mining operations at three sites operated by Mountain Home Concrete and two locations operated by Guy King and Sons, Arkansas Department of Environmental Quality said in a release.
All the affected sites are located between the bridges over Crooked Creek on Arkansas 14 and Arkansas 101 in Marion County, the department said.