Floodplain Regulations

Floodplain Development

A Floodplain Permit Application must be submitted and approved by the Floodplain Administrator prior to all development activity to assure the County and the property owner(s) that all applicable flood code standards are met.

The Cascade County Floodplain Regulations detail permit requirements within the designated floodplain in Section 8 and 9.  A Floodplain Permit is required for any human-made changes to real property, including but not limited to:

• Construction, reconstruction, repair, placement of a building, or any structural alteration to a building;
• Substantial improvement of an existing building;
• Installation of a manufactured home on a site, preparing a site for a manufacture home, or installing a recreational vehicle on a site for more than 180 consecutive days;
• Installation of utilities, construction of roads, bridges, culverts or similar projects;
• Construction or maintenance of levees or riprap;
• Drilling, mining, filling, dredging, grading, excavating, paving, or other alterations of the ground surface;
• Storage of materials including the placement of gas and liquid storage tanks; and
• Channel modifications or any other activity that might change the direction, height, or velocity of flood or surface waters.

Floodplain Permits are not required for routine maintenance of existing buildings, bridge deck rehabilitation, roadway pavement preservation, tilling, farming, irrigating, ranching, harvesting, and grazing of the land, which do  not involve structures, or filling, grading or construction of levees.

Applicant unsure of whether a Floodplain Permit is required for a project should contact the Department.  A Determination Request form can be submitted requesting a floodplain determination.

Subdivision Development

The Cascade County Subdivision Regulations require that proposed subdivisions that contain flood hazard area comply with Section 10-14 of the Cascade County Subdivision Regulations.