See: Leon County Pleistocene coastal terraces Lake Iamonia area is known to have supported a variety of megafauna from as far back as 23.6 Ma.

Lake Iamonia is pronounced "I-monia" and is named after a Seminole town “Hiamonee,” which was located on the banks of the Ochlockonee River.

Tall Timbers Research Station and Land Conservancy is situated on a bluff on the north side of the lake.

In 1910, a dam was constructed across the western end sloughs with two small bridges separated by 1,850 feet (564 m) of fill dirt.

A concrete spillway was constructed for overflow with metal pipes of diameter 60 inches (152 cm) and sluice gates built into the earthen dikes at the sink.

In 1978 the Florida Fish and Wildlife Conservation Commission constructed draw down structures in the sink basin on the north end and under the bridge on N. Meridian Road but were removed by 1980 due to damage from bald cypress roots.

Northwest Florida Water Management District welded the sluice gates open and the sink drains continuously.

Iamonia is an attraction for sport fishing with largemouth bass, bluegill, black crappie, flier, redear sunfish, Florida gar, bowfin and American pickerel.