In 2012, archeological work prior to construction of the Stan Musial Bridge across the Mississippi discovered artifacts and evidence of a formerly unidentified 900-year-old suburb of Cahokia in present-day East St. Louis. This site had not been mapped in the 19th century, and was unknown. The Mississippian culture site is in a present industrial wasteland. Researchers found evidence of more than 1,000 dwellings and the base of an earthen pyramidal mound. It would have been one of dozens of mounds when the community was active, based on the size of the residential population of this site. Discovery of the site led scholars to increase their estimates of the total population of the Mississippians at Cahokia and in the area, now thought to have been about 20,000. They did not have the time to excavate the entire area. It is on private land and subject to risk of destruction by development.