FLOODPLAIN DEVELOPMENT PERMIT
A Floodplain Development Permit may be required for development within a designated floodplain.
AGENCY: Local City or County Floodplain Administrator
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WHO NEEDS A FLOODPLAIN DEVELOPMENT PERMIT?
A Floodplain Development Permit is for applicants proposing development within a designated floodplain.
Floodplain Development permits are administered by the city or county Floodplain Administrator where the project is located.
Depending on the project, engineering or additional local requirements may apply.
See Examples of Floodplain Development Projects →
Find Your Local Floodplain Administrator →
DNRC also provides statewide floodplain mapping resources and more information here. View Montana’s Floodplain Maps →
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BEFORE YOU START:
See what information, photos, plans and project details may be helpful to have ready. You can start your application and return anytime.
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1. COMPLETE THE JOINT APPLICATION FORM IN GILLY
Create an account and begin your application.
Gilly guides you through the project information and any additional questions required for the permit.
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2. DOWNLOAD & SUBMIT TO YOUR LOCAL FLOODPLAIN ADMINISTRATOR
Before submitting, contact your local Floodplain Administrator. Requirements vary by community, and additional information or engineering may be required.
Download your completed Joint Application Form from Gilly and submit it to the city or county Floodplain Administrator for your project location.
Floodplain Development Permit applications are not submitted through Gilly.
FLOODPLAIN DEVELOPMENT PROJECT EXAMPLES MAY INCLUDE:
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BUILDINGS & PROPERTY DEVELOPMENT
New buildings
Additions or other structures
Wells or septic systems
Fill placed within the floodplain
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ROADS & ACCESS
Roads
Driveways
Culverts
Bridges
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WATER & SITE IMPROVEMENTS
Ponds
Drainage features
Other improvements within the floodplain
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FILL & GRADING
Placement of fill
Excavation or grading associated with development
SOME PROJECTS MAY REQUIRE ENGINEERING
Certain projects may require a licensed Montana engineer to address whether the project can withstand a 100-year flood, avoid adverse effects on surrounding properties and determine its effect on the 100-year base flood elevation.
FLOODPLAIN DEVELOPMENT PERMIT RELATED INFORMATION
Prepare Before You Apply →
Understand the Permit Process & the Joint Application Form →
Find Your Local Floodplain Administrator →