Accessing the Roaring Fork is very easy. Public access exists regularly from Aspen clear down to Glenwood Springs. Highway 82 runs the length of the river and anglers will find considerable access throughout much of this route. Fishing access around Carbondale and Basalt can be , to find and quite productive.
One item to note- While a very wadable river, there is certainly no shortage of moss covered, bowling ball sized rocks covering the streambed. Anglers should wade with caution when learning the river.