It seems our Rippey and Orson ancestors lived in an area that's now attractive to campers and wildlife enthusiasts. Here's a map of the area with links and here's an overview. The Holtwood Dam is lower on the Susquehanna, and it backs water up to this area. The power company bought land in the area in connection with the dam which is now preserved from development.
As I posted yesterday, George Orson (Mary's brother) may have operated the Shenk's Ferry, presumably from the Orson land on the west bank. Googling "Shenk's Ferry" gave some interesting results. The Shenk's Ferry Wildflower Preserve is on the east side of the Susquehanna. The Urey overlook on the west side of the Susquehanna is near, and possibly on, the Orson land. The Otter Creek area possibly contains old growth forest (i.e., never logged). Follow this link. Finally, "Shenks Ferry" designates a culture of the Woodland Indians, based excavations done in Conestoga Township (east bank).
I've added a line indicating the probable Shenks Ferry route to this
View Chanceford (Rippey/Orson/Stewart) Map in a larger map