There are 31 miles of mapped streams within the corporate boundaries of Mason City. In order to maximize the potential of our waterfront while at the same time enhancing public safety and property values, the City has adopted flood plain regulations that govern development within the City's mapped flood plains. Mason City is a delegated community. Consequently, the City is responsible for nearly all flood plain administration within the corporate limits. A local flood plain development permit is required for all development in the flood plain. Flood plains are regulated within the City's Zoning Ordinance. The maps currently in force were adopted effective May 16, 2012. The current effective maps can be viewed online at the FEMA Map Service Center. The Flood Insurance Study can be viewed here; Preliminary Flood Insurance Study.
Residents and developers in Mason City should note that the City of Mason City regulates most Shaded Zone X flood plain areas in the same way we regulate AE flood zones. If your property is in a Shaded Zone X area, please contact the Flood Plain Administrator at 641-421-3626 to determine if development is subject to the City's Flood Plain Management Ordinance.