An international mountain biking organization has been given the go-ahead by the Hall County Board of Commissioners to begin designing a trail for the Cherokee Bluffs Park in Flowery Branch. The commission approved the project Thursday, and the International Mountain Bicycling Association has agreed to design the trail. “IMBA really is the premiere worldwide mountain biking organization,” said Tom Souret, director of the Southeast region for IMBA. “This will be the first trail system in Hall County that IMBA has designed from scratch, maybe the first in Georgia.