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Larimer County Floodplain Mapping


The Federal Emergency Management Agency (FEMA) requires that Larimer County, along with all local governments which participate in the National Flood Insurance Program adopt FEMA floodplain maps.

Floodplain maps prepared by FEMA are referred to as Flood Insurance Rate Maps (FIRM). In an effort to upgrade its mapping on a national basis, FEMA is in the process of converting from paper maps to a digital map product. The new maps are referred to as Digital Flood Insurance Rate Maps, or DFIRM panels. FEMA has also updated the Flood Insurance Study (Volumes 1 through 4) as part of this upgrade.

Larimer County was selected to be among the first counties in Colorado to have its flood maps converted to a digital format. The Colorado Water Conservation Board (CWCB) staff acted as FEMA's contracting agency for this work. Beginning in January, 2005, the CWCB hired consulting engineering firm PBS&J of Denver, Colorado to develop the County's DFIRM maps. As part of that effort, certain floodplain reaches in Larimer County were selected to be restudied. These reaches were:

This restudy and mapping effort was ongoing through 2005, resulting in mapping that was made available for review in early December, 2005. The maps then went through two 90 day review periods during 2005 which resulted in minor changes being made. Subsequent to the FEMA review process, the maps and Flood Insurance Study were adopted by the Larimer County Commissioners at an advertised public hearing on December 4, 2006. Persons having questions about the maps and study or their interpretation may contact Jeri Feil of the Larimer County Engineering Department by phone at (970) 498-5703, or send e-mail.



Flood Insurance Rate Maps

Flood Insurance Study, Volume 1

Flood Insurance Study, Volume 2

Flood Insurance Study, Volume 3

Flood Insurance Study, Volume 4


Federal Emergency Management Administration (FEMA)




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