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1539 Eleventh Ave. Helena, MT 59601
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Silver Bow Creek Floodplain Study Products


 Butte Silver Bow website header

Butte-Silver Bow County has been working with The Department of Environmental Quality (DEQ) and Pioneer Technical to complete the Silver Bow Creek/Streamside Tailings Superfund remediation project.  The cleanup, which consisted of removing six million yards of tailings (mine waste containing heavy metals) and related impacted soils from the floodplain of Silver Bow Creek, the reconstruction of the stream channel and floodplain, and re-vegetation of the affected area, has been completed.  As a result of this cleanup, a floodplain mapping revision is required.

When finalized, the new revised maps could have effects on some property owners in the mapped floodplain. If you are currently or will be shown in a 100-Year Floodplain, see the 100-Year Floodplain link to understand what may mean for you.  

Finalizing the Maps and Study 

FEMA held a 90-day comment and appeal period about the proposed floodplain map changes for Silver Bow Creek May 6 - August 4, 2021.  

FEMA is currently in the process of finalizing the Flood Insurance Rate Maps and updating the county's Flood Insurance Study.  The updated maps and report are expected to go into effect on June 1, 2022, and will replace the existing Silver Bow Creek floodplain maps and county Flood Insurance Study.    

View Preliminary Floodplain Maps

Click on the link below to see the proposed floodplain maps and how the preliminary maps compare to the existing FEMA floodplain maps on an interactive map viewer.  

or you can view individual preliminary maps here: 

Preliminary Flood Insurance Rate Maps and Flood Insurance Study 

Get more information on floodplain designations referenced on the maps:

View Technical Reports:

Hydrology Report
Hydraulic Report 

Project Timeline

 Silver Bow Creek Timeline 2022

For more information, contact:

Dylan Pipinich
Butte- Silver Bow County

(406) 497-6256

Tiffany Lyden

(406) 444-0599

Nadene Wadsworth

(406) 444-6732