In speaking with a local geologist, I learned that the gorge that the Minnehaha Creek runs through was once a channel of the Mississippi River. Saint Anthony falls started near where the Minnesota and Mississippi Rivers meet near the Airport about 10,000 years ago. The falls was about 180 feet tall. The falls migrated north about 4 feet each year. As the falls passed the area near the present day Old Soldiers Home, a large rock caused the channel to split in two. The falls continued to migrate north on the east side of the rock, but it ran into harder rock on the west side and stopped migrating up river. The Mississippi River settled into the east channel, leaving the west channel high and dry. The Minnehaha Creek, however, used the west channel as its path for its last mile to the Great River, which is what we see today.