FLOODPLAIN DEVELOPMENT PERMIT
A Floodplain Development Permit may be required for development within a designated floodplain.
AGENCY: Local City or County Floodplain Administrator
-
WHO NEEDS A FLOODPLAIN PERMIT?
A Floodplain Permit is for applicants proposing new construction within a designated floodplain.
Floodplain 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 Projects →
Find Your Local Floodplain Administrator →
DNRC also provides statewide floodplain mapping resources and more information here. View Montana’s Floodplain Maps →
-
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.
-
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.
-
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 Permit applications are not submitted through Gilly.
-
REVIEW:
Your local Floodplain Administrator reviews the application and may request additional information or engineering depending on the project.
-
REVIEW TIME:
Approximately 60 days
-
FEE:
Varies by city or county. Check with your local Floodplain Administrator.
-
ADDITIONAL PERMITS NEEDED:
All required local, state and federal permits must be issued before a Floodplain Permit can be issued.
Floodplain Project examples may include:
-
BUILDINGS & PROPERTY DEVELOPMENT:
New construction, additions or expansion of existing structures, grading, excavation and placing fill within the floodplain. -
ROADS & ACCESS:
New roads, driveways, bridges and other crossings. -
STREAMBANK & FLOOD CONTROL:
Bank stabilization, riprap, flood-control structures and modifications to surface-water diversions. -
UTILITIES & INFRASTRUCTURE:
Buried or suspended utility lines, water or sewer infrastructure and related development. -
RECREATION & WATER ACCESS:
Docks, boat ramps and similar structures. -
MATERIAL STORAGE:
Storage or placement of equipment, materials or other obstructions within the regulated floodplain
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.