To start the trail you'll want to park at the bottom of Deadman Creek.
You'll have a long climb to start with, all on singletrack, that will work its way up the drainage. There is only one junction on Deadman near the beginning that you'll need to stay right for, otherwise the trail is very easy to follow up to the saddle. Once at the saddle there will be a steep descent into Cow Creek.
The trail along Cow Creek is a classic creek singletrack with a number of creek crossings. At the bottom of Cow Creek you'll bear right and climb to a plateau overlooking Arrow Rock Reservoir.