Smoky Valley Roller Mill, now known as the McPherson County Old Mill Museum, is an historic mill and museum on Mill Street in Lindsborg, Kansas. Smoky Valley Roller Mill was built in 1898 to make flour from wheat. The Roller Mill was operated by several different owners until closing in 1955. It was originally water powered, but converted to electricity in the 1930s. The building was given to McPherson County in 1962. George Tesarek, a retired Quaker Oats miller from St. Joseph, Mo. led the restoration of the building from 1974 to 1981.