 SR 257 connects I-81 and U.S. Route 11 (US 11) with Bridgewater and Dayton, between which the highway runs concurrently with SR 42.The state highway also provides access to Bridgewater College and connects Dayton with the western Rockingham County communities of Briery Branch, Ottobine and Montezuma.SR 257 begins at the intersection of SR 902 and SR 924 (Briery Branch Road) within George Washington National Forest west of Briery Branch.