[tricky]

Could that have been across from what is now Earthbound Beer? If so, they hand-dug all the debris out of the cave and you can pretty easily get a tour. The owner said the cave under the cave is off limits b/c they almost ran out of air while exploring it.

[tomwheeler]

It probably was. It was definitely on the north side of the street and west of Jefferson, so that would be about right.

[stl_fan]

Check out the book "Lost Caves of St. Louis" - it even contains a map of the caves.