The highway begins in Jefferson Township at a cloverleaf interchange with Route 15 and Espanong Road.

The two routes parallel northwestward and intersect with Blue Heron Drive, which connects the two roads.

The two-lane road winds northwest through the center of Sparta, reaching a junction with County Route 517 (CR 517; Sparta Avenue), which connects to Route 15 once again.

The designation was assigned in 1938, eleven years after the then-current highway system in New Jersey was started.

[3] The state highway route designation remained intact for fifteen years, until January 1, 1953, when the routes in state of New Jersey underwent a large renumbering.