Take US 33 northwest from I-270 towards Marysville. Continue on US 33 until you come to the State Route 347 exit in Logan County (past Marysville). Take the 347 exit and turn left (SW) onto 347.  Take it to the stop sign and turn right onto Logan Co. Rd. 144. The Otter Run entrance will be 1.4 miles on your right. There is a large yellow sign (reads “Stop Ahead”) just before the entrance to Otter Run.