Floodplain Mapping Projects

FEMA has available several services for different phases of a mapping project. Preliminary, Pending and Effective products can be downloaded on from the Map Service Center. FEMA also maintains several map viewers:

National Flood Hazard Layer - displays the effective digital data
> Flood Map Changes Viewer  - includes the Preliminary and Pending digital map data, with a Changes Since Last FIRM layer that compares the Preliminary/Pending data with the effective data

KDA maintains project-specific map viewers for active projects that are based on the same digital data. The web links are included on the project pages below. 

Upper Republican Custom Watershed

The Upper Republican Custom Watershed Floodplain Mapping update project will produce Base Level Engineering (BLE) floodplains for the entire custom watershed. They are beginning to be produced and should be available in early 2022. Enhanced data development is anticipated to begin in 2023 for the areas that will undergo a regulatory update. This website will be updated with relevant content as the project moves forward. The initial Kickoff Meeting was held June 17, 2021. The Discovery meeting was held August 5, 2022. Regulatory updates are planned for Cheyenne, Rawlins, Decatur, and Thomas counties.

Cheyenne County






Thomas County

Thomas County DD Kickoff - 5/14/2024


Upper Republican Custom Watershed

Upper Republican Kickoff Meeting 6-17-2021

Upper Republican Discovery Meeting 8-5-2022

Upper Republican Discovery Report

Upper Republican Custom Watershed

Unsure which watershed you are in?  Use the following link to find out.
Kansas HUC 8 Watershed Map

Or reference the map below for Custom Watershed project areas.

Project Reference Map

Use this page to find relevant information on floodplain mapping projects.  Click on the map below to view current or proposed floodplain mapping projects.  Use the Kansas Floodplain Map Viewer for current effective floodplains.