It's the bridge over the Catawba on I-77. Several months ago I had noticed some dirt tracks leading off the interstate. Not the safest thing to do but I decided to pull of and see where they went. Turns out they are basically dirt roads that criss-cross around the river/area. I did figure out that they come out by come apartments, which is a much better way to get back in there. I sent you both PM's with a map.
ZRX 1100, XL350R