 Route 181 is a 7 @.@ 47 @-@ mile ( 12 @.@ 02 km ) state highway in Jefferson Township and Sparta Township in New Jersey . The highway begins in Jefferson Township at a cloverleaf interchange with Route 15 and <unk> Road . Route 181 serves as the local route through Woodport , serving the eastern shores of Lake Hopatcong as well as the main road through the center of Sparta . The route terminates at a jughandle with Route 15 in Sparta . 
