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1539 Eleventh Ave. Helena, MT 59601
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Preliminary Maps


Below is the most current technical information available for the Musselshell River Flood Maps Project. 

Wheatland County Preliminary Floodplain Maps

This includes the Musselshell River (from west of Harlowton downstream to the county line) and Antelope Creek.

Below are the current FEMA preliminary maps, study, and available technical information.  FEMA's Preliminary Flood Insurance Study and Preliminary Flood Insurance Rate Maps for Wheatland County were initially produced in 2018.  Based on information submitted by the City of Harlowton, some of the Antelope Creek mapping around Harlowton was revised, affecting 8 of the preliminary FEMA maps.  Eight revised preliminary FEMA maps were issued in 2021. A comment and appeal period for all the current Preliminary Flood Insurance Rate Maps and Flood Insurance Study is open until July 13, 2022.  

Preliminary Flood Insurance Study:

Preliminary Flood Insurance Study (Revised 2021) 
Preliminary Flood Insurance Study (2018) 

 Index 

Panel 0450C Panel 0520C Panel 0537C* Panel 0590C Panel 0810C
Panel 0475C Panel 0529C* Panel 0541C* Panel 0605C Panel 0815C
Panel 0500C Panel 0530C* Panel 0545C Panel 0700C Panel 0820C
Panel 0509C Panel 0533C* Panel 0565C Panel 0780C
Panel 0510C Panel 0535C* Panel 0570C Panel 0785C
Panel 0517C Panel 0536C Panel 0585C  Panel 0805C

                *Panel revised in 2021 from initial 2018 Preliminary Panel 

Petroleum County Preliminary Floodplain Maps

This includes two sections of newly mapped floodplain on the Musselshell River.  These Preliminary maps were finalized and became effective on 11/15/19.  To view the effective maps, visit FEMA's Map Service Center

Rosebud/Musselshell County Border Preliminary Floodplain Maps

This includes the Musselshell River on the Rosebud/Musselshell border, from north to south and ending at Melstone. These Preliminary maps were finalized and became effective on 11/15/19.  To view the effective maps, visit FEMA's Map Service Center

Musselshell County Preliminary Floodplain Maps

This includes the mainstem of the Musselshell River through Musselshell County.  These Preliminary maps were finalized and became effective on 11/15/19. Mapped floodplains on other tributary streams were digitized from the original 1979 floodplain maps and included on the 11/15/19 maps.  To view the effective maps, visit FEMA's Map Service Center

Golden Valley County Preliminary Floodplain Maps

This includes the Musselshell River mainstem through Golden Valley County.  These Preliminary maps were finalized and became effective on 11/5/21. To view the effective maps, visit FEMA's Map Service Center

Technical information
 

Technical Reports:

Pioneer Technical Services, Inc (Butte, MT) and Morrison-Maierle, Inc (Helena, MT) were contracted to perform a majority of the data collection, engineering, and technical work. The completed studies may be viewed below.  


Survey crews were on the river through the summer of 2015. Thank you to all the landowners along the Musselshell River and Antelope Creek who gave the contractors working on this project permission to cross the landowner's property. Their willingness to assist with this project is greatly appreciated.

Maps of the Musselshell River Study Region: