Silver Bow Creek Floodplain Study Products
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 11 - August 9, 2021 (expected)
FEMA will open an official 90 day comment and appeal period about the proposed floodplain changes - expected May 11 - August 9, 2021. Any comments or appeals to the Preliminary Maps will need to be submitted by August 9, 2021 to the Butte-Silver Bow Planning Department.
For more information see:
Appeal & Comment Fact Sheet
click here for Appeal & Comment Form
What is the project timeline
Points of Contact for the project:
Lori Casey
Butte- Silver Bow County
lcasey@bsb.mt.gov
(406) 497-6255
Tiffany Lyden
DNRC
Tlyden@mt.gov
(406) 444-0599
Nadene Wadsworth
DNRC
Nadene.Wadsworth@mt.gov
(406) 444-6732