Long before traffic clogged Main Street and backed up on Airport Road, Alkali Creek was a busy transportation corridor.
It must have been an inviting place with a gentle little stream where children could play without too much supervision and women wouldn't have to walk too far with a heavy burden of water.
Trails to bison herds on the bench above and easy access to the Yellowstone River less than a mile away may have attracted bands of hunter-gathers generation after generation in the millennia before contact with Europeans 500 years ago.
Few pretty good photos at the link.