Trail-goers in Forsyth County and Alpharetta can travel only to where the sidewalk ends. Someday, though, their paths could meet.A stretch of Big Creek Greenway that links the two sides is in the plans, and a recent Alpharetta extension of the trail has brought it closer.In June, the city opened up a new .85 mile section, which reaches Marconi Drive near Windward Parkway.Forsyth County’s portion of the greenway ends at the trailhead on McFarland Parkway. Nearby, however, an 8-foot wide multi-use trail along Ronald Reagan Boulevard extends the path system to McGinnis Ferry Road at the county line.A connection has been the plan from the start, said Mike Perry, Alpharetta’s recreation and parks director.“Y’all have done your part.