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DNRC Headquarters
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 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, you can prepare for the eventual adoption of new Flood Insurance Rate Maps by taking the steps below. 

View Preliminary Floodplain Maps

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

Or you can view individual preliminary maps here:

View preliminary floodplain maps 

Get more information on floodplain designations referenced on the maps:

View Technical Reports:

Hydrology Report
Hydraulic Report

FEMA 90-Day Appeal and Comment Period - May 6 - August 4, 2021 

FEMA will open an official 90 day comment and appeal period about the proposed floodplain changes: May 6 - August 4, 2021Any comments or appeals to the Preliminary Maps will need to be submitted by August 4, 2021 to the Butte-Silver Bow Planning Department. 

For more information see: 
Appeal & Comment Fact Sheet
Appeal & Comment Form 

 What is the project timeline



Points of Contact for the project:

Lori Casey
Butte- Silver Bow County

(406) 497-6255

Tiffany Lyden

(406) 444-0599

Nadene Wadsworth

(406) 444-6732