A display of geodes, with their mysterious crystal formations in their hollow cavities, can be seen at the park office.

Over the years, the lake has become well known for excellent fishing for largemouth bass, bluegill, crappie, channel catfish, bullhead, red-eared sunfish.

The Civilian Conservation Corps moved onto the grounds to begin clearing trees, creating roads and building structures.

Also opened at the time was an airstrip, making Geode the only park that invited travelers to arrive by private plane.

On Saturday, July 25, 2009, a RAGBRAI participant, Donald D. Myers from Rolla, Missouri, died from injuries sustained in a crash at the bottom of the hill near Geode Lake dam at Geode State Park.