SR 137 begins in Cusseta, within Chattahoochee County, at an intersection with Wells Street, which used to also bear the designation of SR 520 Business. It runs along Broad Street, which also used to bear the SR 520 Business designation, for nearly 1,000 feet (300 m), until SR 137 heads northeast. Just northeast of Cusseta, it has a very brief concurrency with SR 26. It continues to the northeast and cuts across the southeastern corner of Fort Benning and begins a concurrency with SR 355, just before leaving the fort. When the highway leaves the fort, it enters Marion County. It passes SR 137 Spur. Just northwest of Buena Vista is an intersection with SR 41. The two routes head southeast into town and split, with SR 41 heading south and SR 137 heading east and then northeast. SR 137 travels through rural areas of the county and has a very brief concurrency with SR 240 in Tazewell. In the northeast, it enters Taylor County and crosses just northwest of the Taylor–Schley county line. Less than 2 miles (3.2 km) later is SR 90/SR 127. The three highways have a brief concurrency to the north, until SR 137 splits off to the northeast. Just southwest of Butler is SR 96. In town, it meets US 19/SR 3. SR 137 continues to the northeast until it reaches its eastern terminus, an intersection with SR 128, just south of the Flint River.
SR 137 is not part of the National Highway System, a system of roadways important to the nation's economy, defense, and mobility.