The Santee Branch trail is a very well maintained trail which is great for Trail running, Hiking or Biking, This trail was considered as the main thru trail of the Patapsco Valley State Park. The trail is blazed in ( WHITE ) just like the Appalachian Trail (AT). There are multiple access points to this long trail. At this time, all trails breaking off of the main Santee Branch trail leading to the Grist Mill Trail are CLOSED so you can't do a loop.
The Original thru trail is 22 miles long one way. This section of the trail can be accessed from Glen Artney by the fire road or from Bull Run, The College loop, Hilton Park area. and at the top of the Hilltop parking lot. The section north of S. Hilltop Rd. is not well maintained as the lower section.