River Rock Subdivision is also under Gallatin County jurisdiction. Be sure to check with the Gallatin County Planning Department to see if you need to file any applications with their office. Some improvements require a Land Use Permit. The links below are directly from the Gallatin County Planning Departments website.
Gallatin County Planning Department Website
River Rock Zoning Regulations
Regulations – RV River Rock (virtualtownhall.net)
Gallatin County Land Use Permit
Land Use Permit Application – LUP Application_8.23_REVIEW (virtualtownhall.net)