ANAMOSA, Iowa (AP) -

An eastern Iowa state park could become the first in Iowa to be designated in its entirety as a National Historic District.

Wapsipinicon State Park on the south edge of Anamosa was built in the 1920s with labor from the Anamosa State Reformatory, a state-run prison.

The Gazette in Cedar Rapids reports the State Historical Society of Iowa recently awarded a $7,000 grant to the Jones County Historic Preservation Commission to help research and prepare the historic district application to the National Park Service.

A national designation could help the Iowa Department of Natural Resources fund preservation of sites in the 400-acre park which features limestone bluffs, caves, and archaeological sites thousands of years old.

A National Register of Historic Places nomination is expected to be submitted in 2014.