The mound has dimensions of 92 feet in height, 951 feet (290 meters) long and 836 feet (255 meters) wide. Monks Mound base covers about 14.4 acres and has a volume of about 21,551,623 cubic feet (610274 cubic meters) and consists of more than 2.16 billion pounds of non-local soil types.
A few articles on Cahokia Mounds:
http://www.world-pyramids.com/atr/usa/monkmound.html
http://www.freewebs.com/historyofmonksmound/index.htm
http://www.bibliotecapleyades.net/arqueologia/monks_mound.htm