Modeled Flood Inundation Scenarios for Tuttle Creek Release and Kansas River Levels

We apologize, but the maps on this page are temporarily unavailable.

We are working to update the information and will publish the links as soon as work is finished. For information about flooding in Manhattan, please visit the Riley County GIS map viewer at

Riley County Community GIS Viewer

Flood maps and information is still available by using the Riley County Community GIS Viewer. Once on the landing page follow these instructions:

  1. Navigate to and click the “Layers” tab along the top banner of the webpage.
  2. Expand the “Hydrology” drop down menu.
  3. Select “Flood Hazard Area” and the layer will appear on the screen.

FEMA’s Flood Map Service Center

FEMA provides a tool to view and create a “FIRMette,” or a small map that demonstrates the flood information for one property. To simply view a properties FIRM information, click here and enter the full property address in the search bar at the top of the page.  There is a thorough tutorial for creating a FIRMette available here on FEMA’s website.

If you experience difficulties accessing or interpreting the information, please contact the Community Development Department at 785-587-2412 and provide the subject property address as well as a description of the inquiry.

To better understand the dynamics of potential flooding on the Big Blue River below Tuttle Creek Reservoir and the Kansas River, the City of Manhattan hired Wood Environmental and Infrastructure, Inc. to create 42 different flooding scenarios based on seven different releases from Tuttle Creek Reservoir and six different river heights on the Kansas River. The flood modeling was done using HEC-RAS 2D.  The modeling report can be found below within the interactive map.  A tutorial on how to use the map and layers is to the right.

Although the modeling was professionally created, the model has not been checked using high levels of quality assurance and quality control standards that normally occur for detailed flood models and engineering studies.  These flood scenarios were created for emergency planning study only to better understand possible scenarios based upon different releases from Tuttle Creek Reservoir and different heights of the Kansas River.  Official information can be found here: