Utah's Longest and Deepest Caves

Some other interesting info on these caves:

Main Drain is the 11th deepest cave in the US and 9th deepest in the continental US.
Neff's is the 13th deepest cave in the US and the 11th deepest in the continental US.
Nielsen's is the 21st deepest cave in the US and 793rd longest.
Big Brush Creek Cave is the 24th deepest in the US and the 152nd longest.
Little Brush Creek is the 38th deepest in the US and the 132nd longest.
Polygamy's End is the 143rd deepest in the US.

This is according to the caverbob.com website. You can see a complete list here: http://www.caverbob.com/usadeep.htm
http://www.caverbob.com/usalong.htm