General Information

Yes, we do have floods in Yellowstone County, Montana. Wherever there's a river, you can be sure there will be some flooding. Tim Miller is the Floodplain Administrator for Yellowstone County.

The floodplain regulations shall apply to all lands within the jurisdiction of the County of Yellowstone, State of Montana, shown on maps and other documents as being located within a 100-year floodplain as described below:

A. FEMA Flood Insurance Study for Yellowstone County, Montana and Incorporated Areas, with accompanying Flood Insurance Rate Maps (FIRM) dated November 6, 2013.

B. MTDNRC Final Order dated August 10, 2004 adopting the 100 year floodplain, floodway boundaries and the corresponding Base Flood Elevations for Unnamed Creek and for Dry Creek with Flood Insurance Studies and maps provided by the contract engineer.

C. MTDNRC Final Order dated August 10, 2004 adopting the 100 year floodplain, floodway boundaries and the corresponding Base Flood Elevations for Cove Creek with Flood Insurance Studies and maps provided by the contract engineer.

D. MTDNRC Final Order dated August 10, 2004 adopting the 100 year floodplain, floodway boundaries and the corresponding Base Flood Elevations for Five Mile Creek with Flood Insurance Studies and maps provided by the contract engineer.

E. "Best Available Data" as shown on the "Map of Flood-Prone Areas by the US Department of Interior, USGS.

The floodplain maps referenced above shall be on file in the Office of the Yellowstone County Floodplain Administrator.

The boundaries of the 100-year floodway shall be determined by scaling distances on the Official Floodplain Maps and using the floodway data table contained in the flood insurance study report. The maps may be used as a guide for determining the 100-year floodplain boundary, but the exact location of the floodplain boundary shall be determined where the base flood elevation intersects the natural ground. For unnumbered A Zones and AO Zone floodplains, where there is a conflict between a mapped floodplain boundary and actual field conditions, the Floodplain Administrator may interpret the location of the 100-year floodplain boundary based on field conditions or available historical flood information.