The 344 acre the park encompasses what was once the town of Preparation. In 1853, Charles B. Thompson broke from the Mormon wagon train to Utah after receiving a message from the "Spirit." The Mormon leader and elder led 50 to 60 Mormon families to Kanesville, now Council Bluffs. Upon much searching, Thompson and a few select men chose the area called "Monona," an Indian name meaning "Peaceful Valley." Here they organized the town of Preparation, complete with houses and schools and started Monona County's first newspaper which Thompson owned and operated.
