Update on Preliminary Floodplain Maps

Where are the preliminary floodplain maps for the Clark Fork, Bitterroot River, and Rock Creek?

The release of preliminary floodplain maps is delayed several months due to an update in how the Clark Fork River floodway may be mapped on the landward, or south, side of of the Orchard Homes Levee. The floodway is generally the channel of a river that is the highest hazard and must be reserved to discharge the floodwater.

Updated guidance from FEMA allows some levees to be considered for flood protection even if they are not accredited for flood insurance. The DNRC is working on updates to the draft maps so the community has a better understanding of the changes.

While properties shown as being in 100-year floodplain in the draft maps will not change with this revision, some of those properties may not be considered as within the floodway. That affected area is generally west of Reserve Street and north of South 3rd Street West. Areas north of the river may need to be designated as the floodway. County staff is expecting updated draft maps this winter.

Check out the latest commissioner's podcast on floodplain mapping to learn more!