D-23 is the Pearman foundation at the edge of Drum Island and the Cooper River. Mickey saved the day with both the video and high resolution images.
Here is the before - from river level on January 25, 2006
From the Ravenel Bridge, Mickey captured the action - which I like better than my horizontal perspective
Attribution: C. Frank Starmer and Sparky Witte from http://oldcooperriverbridge.org