Yes, you need to turn left before you get back to the starting point and cross an open field which takes you to the pack of the old Strabane Acedemy School, follow the fence line round which leads you evenyually onto the Liskey Road. The bridge is just below the Academy and crossers the Cavanalee River (the Burn) and eventually runs into the River Mourne. Some of the instructions are contained in this video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_qIZUIqgiDo.html&ab_channel=AidanDevlin