In a much gentler fashion  

A friend with a keen interest in juggling visited over the weekend, and we ended up at the Oak Street Beach with a bunch of jugglers.

From the Wikipedia entry for the Oak Street Beach:

Up until the late 1800s the Lake Shore sloped from Oak Street to the Chicago river in a much gentler fashion. However the construction of a shipping pier at the river led to a build up of sand and silt just to the north. As the land rose up out of the water squatters began to take residence, leading to disputes with lakefront property owners.

The biggest series of clashes surrounded a man named George Streeter in 1886. Streeter's boat, with passengers and cargo, became stranded on the sandbar created by the pier. As he unloaded waste and cargo, he created a small island. Eventually he persuaded people to dump more there, and claimed a sizable island. However the city would not stand for it, and after legal battles (some of which included gun fights) Streeter was evicted and the land, which was eventually filled in, became part of Chicago and became known as Streeterville.