Tryon Creek, which flows through the middle of the state park, also runs through Marshall Park, a modified natural area of about in a canyon in the hills northwest of Mount Sylvania. It features hiking trails, a playground, picnic tables, a waterfall, and a stone bridge over the creek. Other parks in the watershed include West Portland Park, a natural area of about , and Maricara Park, a natural area of about . Metro plans to acquire additional land along the creek to add to the parks.