That's exactly where that is Bill. I'm as far from an expert on the Pines as they come but Harrisville is my favorite place in the Pines and before moving to Florida, I spent a lot of time wandering out there. If you google maps that area, you can still see the canal and when you zoom in on where the canal hits the Wading, you can still see that lock, or bridge, whatever that structure is. It definitely wasn't visible last time I was there.
God I miss the Pines!