On 7/23/11 we came by this school and decided to stop at the antique store which was built on the south side of it to see if we could get on the property to photograph it. The antique store is "Apple Tree Antiques." We talked to the property owners' daughter who gave us the school's name and said it was built by the 1870s.
8/17/12 update. The school was used from 1867 until 1941. Thanks to Val Root for this info.
10/17/14 update. The Des Moines Register shows this school as being built in 1865.
The following photo was provided via Val Root