(Ocean #4) W. of Ottawa, Ottawa Township, La Salle County, IL. Boyce Memorial Dr. S. 1.0 miles from jct with US6 on the W. side of Ottawa, SW on Ottawa Av. 0.5 miles, S. on 174th Av. 2 blocks to the tower on the E. side of the road. (N41 19.941 W88 52.411) Photos 10-2-12.