I think what put this 37-acre natural area on my radar is when word went out that they'd closed off the Madison Avenue entry to it. I hadn't really heard of it until then. So, when word went out recently how they'd opened that entry again, I went to check it out.
The entry off of Madison, south of SE 4th Street near Marisol Assisted Living, winds down to the official trail; this seems easier than parking off of Lincoln at the 'official' trailhead.
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They named it 'Old St. Louis' after it being near the location of the first settlement of Loveland, which was known as 'St.Louis.' The area stretches westward toward St. Louis Avenue.