FEMA Flood Mapping Update

FEMA Flood Map Update

Flooding is the most frequent and costly disaster in the United States. The risk for flooding changes over time due to erosion, land use, weather events and other factors. Due to these changes, the flood maps for the City of Grimes and Polk County are in the process of being updated. The Federal Emergency Management Agency (FEMA) has prepared Preliminary Flood Insurance Rate Maps (FIRMs) which will replace the maps that were last updated in 1992.

The current FIRMs for the City of Grimes were adopted in 1992 and do not accurately reflect today’s risk of flooding. As a result, the City of Grimes' FIRMs are currently being updated, with the final version expected in 2016.

Public Meeting - January 7, 2016 6pm:  Local officials held a public meeting for the City of Grimes on January 7, 2016, 6pm at the Grimes Community Complex located at 410 SE Main St. in Grimes in the Banquet Hall.  Local government staff was available to assist residents one-on-one and provide information at the public meeting.   Additional information on the Iowa Floodplain Mapping Program can be found at http://ifis.iowafloodcenter.org/ifis/newmaps/hazard/.  For general information about the flood map modernization project, you can contact the John Gade, the City Engineer at 515-233-0000 or email at jmg@foxeng.com.

FEMA Presentation from meeting held January 7, 2016  (PDF)

To view the Effective Flood Maps, please navigate the links below.

To view the Preliminary FIRM Maps, please navigate the links below.

These maps illustrate the changes from the FIRM maps that were effective to those that are now proposed. (Revised May 2018)

The new maps help promote public safety.  The Flood Insurance Rate Maps are important tools used in the effort to protect lives and properties in the City of Grimes.  By showing the extent to which areas of Grimes and individual properties are at risk for flooding, the Flood Insurance Rate Maps help property owners and residents make more informed decisions about personal safety and financially protecting their property.  These maps also allow community planners, local officials, engineers, builders and others to make determinations about where and how new structures and developments should be built.

If there is an error in the Flood Insurance Rate Map, you can file a comment or appeal.   The FEMA Flood Insurance Rate Maps are still preliminary.  It is anticipated that starting in January 2016, and running through April 2016, there will be a regulatory Public Comment and Appeal Period.  This is a time when property owners will have the opportunity to submit technical and/or scientific data to file a comment regarding their individual property, or to appeal regarding the accuracy of the mapping process in general. To learn more about comments and appeals, visit www.fema.gov.

When do the maps become effective?  Once all appeals and comments are reviewed and once any appropriate map changes are incorporated, FEMA will issue a Letter of Final Determination.  Six months later, the new Flood Insurance Rate Map for Grimes will become effective, and flood insurance purchase requirements will go into effect. Please be aware that starting immediately these flood hazard maps will be used in helping to determine requirements for construction and development.

Additional Questions.  If you have questions or require additional information, please contact John Gade at (515) 233-0000.