Macks Creek Cave

Just beyond Spring Shores, on the way to Arrowrock Dam, is Macks Creek campground/boat dock. I took the scouts there camping in January. As we were packing camp on Saturday morning, a couple of guys from the Army Corps of Engineers, [who oversee the campground] stopped by to make sure the campground was in good order. They as us if we had found the cave, then told us where it was.
I did not have the camera on the scout campout, but mom and I went there the other night and did a little exploring.
The cave is a lava tube that is normally under 80-90 feet of water. When the water is low like it is now, the cave appears. Pretty cool. The first picture is the opening of the cave.