(39', 2000, OH-80-02) NW of Marysville, Allen Township, Union County, OH. Northwest Pky (CR133) NW 3.9 miles from jct with US33 on the NW side of Marysville, S. on Bear Swamp Rd. 0.15 miles to the house on the E. side of the road at 18334. (3-17-10, N40 15.675 W83 28.149) Photo by Mark & Gordie Comstock.