“Road 550 bisects the Buffalo Creek Recreation area on the south side of the park.
— Wendy Sweet
Road 550 is a well-maintained dirt road open to motorized traffic. It goes by the Little Scraggy Trailhead, Shingle Mill Trailhead, the Buffalo camping area, and the southwest Buffalo Creek trailhead. It intersects Colorado Trail: Little Scraggy to Wellington Lake Road, Shingle Mill Trail, Tramway Trail 723, Road 543, and Redskin Creek Trail
As it runs parallel to the Colorado Trail: Little Scraggy to Wellington Lake Road and is open to traffic, there is little reason to run on it, barring bad weather, injury, or equipment failure.
It does connect to some trails, but there are better options.