Further down the gorge, Mill Creek passes through Limestone Hills Park, and then forms the western boundary of the DelCastle Recreation Area. Continuing south and passing under Limestone Road, the hills on either side diminish in height, and development increases, although the steep sides have protected the creek from direct encroachment.
As Mill Creek travels further down the gorge, it flows through Limestone Hills Park before reaching the western boundary of the DelCastle Recreation Area.  The creek then passes under Limestone Road, where the hills on either side become less steep and development increases. However, the steep sides have protected the creek from direct encroachment.