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Preliminary Maps & Technical Reports

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Below is the most current technical information available for the West Gallatin River and Bozeman Creek Mapping Re-studies. In 2016 FEMA produced Preliminary Flood Insurance Rate Maps and a Preliminary Flood Insurance Study.  The maps and study information went through a lengthy review and a 90 day appeal period.  Below are the revised maps and study that will go into effect on 4/21/2021. 

Revised Flood Insurance Study (FIS) -  effective 4/21/21
Revised FIS: Volume 1    
Revised FIS: Volume 2     
Revised FIS: Volume 3    
Revised FIS: Volume 4     

Revised Flood Insurance Rate Maps  - effective 4/21/21
Index 1B
Index 2B
Index 3B 

0340E 0569E 0817E*
0345E 0586E 0818E
0555E 0588E* 0819E
0558E 0780E 0905E*
0559E 0790E* 0925E*
0560E 0808E 0931E*
0566E 0809E* 0932E
0567E 0816E*

* revised from 2016 Preliminary Map


Hydrologic Reports

Hydrologic Analysis: Bozeman Creek   Prepared by RESPEC (April 2014)
Hydrologic Analysis: Nash Spring   Prepared by RESPEC (March 2014)
Hydrologic Analysis: Flat Creek   Prepared by RESPEC (January 2014)
Hydrologic Analysis: Figgins Creek   Prepared by RESPEC (March 2014)
Hydrologic Analysis: Mathew-Bird Creek   Prepared by RESPEC (March 2014)
Hydrologic Analysis: Mill Ditch   Prepared by RESPEC (April 2014)
West Gallatin Hydrology Report   Prepared by Morrison-Maierle, Inc. (March 2015) 

Hydraulic Reports
Hydraulic Analysis Report: Bozeman Creek (all reaches)  Prepared by Michael Baker (Oct 2015)
West Gallatin Hydraulic Summary Report   Prepared by Morrison-Maierle, Inc. (Jan 2016) 

 

Technical data
Technical data for Bozeman Creek and its tributaries is available on the City of Bozeman's FTP site. Click here to download the Community_Upload_Format.zip file. Then decompress the file to view technical data including hydrologic analyses, flood profiles, floodway data tables, and HEC-RAS modeling files.

More Info 

Maps & Technical Reports
Gallatin Floodplain FAQs 
FloodSmart

 

Contact the County

Gallatin County Planning 
(406) 582-3130

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