The Perry C. and Mattie Forrest Holdoegel House is a historic dwelling located in Rockwell City, Iowa, United States. Perry C. Holdoegel was a member of the Iowa Senate who was responsible for the legislation that established the state park system in Iowa. It was the first conservation law in Iowa of any significance. He was also responsible for the establishment of Twin Lakes State Park in Calhoun County. The house was built in 1917, the same year Holdoegel entered the state senate. It was designed in the Colonial Revival style by the Fort Dodge architectural firm of Damon and O'Meara. They were also responsible for a similar house in town. The house features a two-story entrance porch that is supported in each corner by three columns of the Doric order, and topped with a balustraded balc