Some of the 64,000 people parading through downtown at the Komen Race For The Cure (very few actually ran). You could no more stop this flow than the Mississippi. The top picture is looking west on Olive. I was standing between 14th and 15th on the platform in front of the Parkside Plaza building. It's hard for me to tell but the crest of that hill is about 22nd or 23rd Street.
Come down to the street view on Downtown St. Louis 365.