Pecan Bayou winds through Brown, Callahan, Coleman, and Mills Counties as one of the five major tributaries of the Colorado River, creating a slow-moving waterway fed by over twenty creeks. The bayou originates from two main branches on the Callahan Divide - the North Prong begins in northwestern Callahan County and eastern Taylor County near Eula, while the South Prong starts twelve miles to the south. These prongs merge in south central Callahan County before flowing through Coleman County and eventually forming Lake Brownwood in Brown County. Below the lake, the bayou continues eastward before entering the Colorado River in Mills County, completing a ninety-mile journey. This peaceful stretch of water offers a mix of flat water sections, fallen pecan trees, and varied structure that supports diverse fishing opportunities across its length.