The largest remaining mound , Mound C , has a base measuring 82 feet ( 25 m ) by 66 feet ( 20 m ) .
Is about 6 feet ( 1.8 m ) in height .
The largest remaining mound , Mound C , has a base measuring 82 feet ( 25 m ) by 66 feet ( 20 m ) and is about 6 feet ( 1.8 m ) in height .