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DNRC Headquarters
1539 Eleventh Ave. Helena, MT 59601
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Maps & Technical Reports


 

Below are the current FEMA preliminary maps and available technical information.  FEMA's Preliminary Flood Insurance Study and Preliminary Flood Insurance Rate Maps were issued 1/15/20 and will go through an official 90 day comment and appeal period in early 2021.  

Preliminary Flood Insurance Study:
Preliminary Flood Insurance Study: Volume 1 
Preliminary Flood Insurance Study: Volume 2
Preliminary Flood Insurance Study: Volume 3
Preliminary Flood Insurance Study: Volume 4 

Beaverhead River Area and Blacktail Deer Creek - Preliminary floodplain maps

Index 1 (North)
Index 2 (South)

Map 1169C Map 1432C Map 1441C Map 1687C Map 1701C
Map 1188C Map 1433C Map 1451C Map 1688C Map 1713C
Map 1189C Map 1436C Map 1679C Map 1689C Map 1907C
Map 1419C Map 1437C Map 1682C Map 1691C Map 1926C
Map 1430C Map 1438C Map 1683C Map 1692C
Map 1431C Map 1439C Map 1684C Map 1694C

 

Lima / Junction Creek Area - Preliminary floodplain maps

Index

Map 2814C Map 2815C Map 3152C

 
Big Hole River - Preliminary floodplain maps

Index

Map 75C Map 350C Map 625C Map 900C Map 1550C
Map 100C Map 475C Map 725C Map 975C
Map 225C Map 500C Map 750C Map 1000C
Map 250C Map 600C Map 877C Map 1150C
Map 275C Map 614C Map 880C Map 1170C
Map 300C Map 615C Map 881C Map 1175C
Map 325C Map 618C Map 885C Map 1275C

Hydrologic Reports
Hydrologic Analysis: Beaverhead River Area Prepared by Pioneer Technical Services(June 2017)
Hydrologic Analysis: Junction Creek  Prepared by DNRC (March 2017)
Hydrologic Analysis: Big Hole River Prepared by Atkins (March 2013)

Hydraulic Reports
Hydraulic Analysis Report: Beaverhead River Prepared by Michael Baker (Oct 2018)
Hydraulic Analysis Report: Blacktail Deer Creek Prepared by DOWL (Nov 2018)
Hydraulic Analysis Report: Selway Slough Prepared by Michael Baker (Oct 2018)
Hydraulic Analysis Report: Junction Creek Prepared by Morrison Maierle (Aug 2018)
Hydraulic Analysis Report: Big Hole River Prepared by RESPEC (Aug 2014)

 

 

 

 

 

 

 

 

 

More Info

Maps & Technical Reports
Floodplain FAQs

Contact the County

Rob Macioroski
County Floodplain Administrator
(406) 683-3768

Contact the City of Dillon

Todd Hazelbaker
City Floodplain Administrator
(406) 683-4245

Contact the Town of Lima

Carla Weidinger
Town Floodplain Administrator
(406) 276-3521

Contact DNRC

Tiffany Lyden
Outreach Specialist
(406) 444-0599