Near the southern boundary of the city of St. Louis ( separating it from St. Louis County ) is the River des Peres , practically the only river or stream within the city limits that is not entirely underground . Most of River des Peres was confined to a channel or put underground in the 1920s and early 1930s . The lower section of the river was the site of some of the worst flooding of the Great Flood of 1993
Great Flood of 1993
Great Flood of 1993
St. Louis