As is my habit, I kept grinding. I made a second visit to the Ponca Access and saw a group of 7 does and fawn north of the low water bridge. Experience has taught me to wait and see what might happen. As it turned out they piled into the river fairly close to my parked car and gave me a nice series of crossing shots.
Don't underestimate the Ponca low water bridge as a setup spot for wildlife crossings. There are trails close to the bridge both upstream and downstream, and others further on both directions. I have shot deer, otter, white winged crows, bald eagles, green herons, blue herons, king fishers, and elk in the river from the bridge. It is worthwhile. I usually stop there twice on any visit to Boxley Valley, sometimes 4 times if I make a double survey of the valley.