Training: BBS Methodology - The BBS Route [page 24/34] Route Description Survey routes are approximately 24.5 miles (39.2 km) long and in most cases are located on suitable secondary roads. Routes are established in the BBS office using a stratified random methodology to choose the start points and direction of the route. A map indicating the start point and path of the BBS route will be provided to you prior to the start of the BBS season. « Prev - Training Main Menu - Next » U.S. Department of the Interior | U.S. Geological Survey Eastern Ecological Science Center Laurel, MD, USA 20708-4038 BBS Homepage Contact Us Last Modified:  2/5/2023 BBS Privacy Statement