Dutch Miller Gap is a destination along the Middle Fork to Salmon La Sac Traverse, or a destination in and of itself. It's a lovely spot, but takes a drive on rough road and a long hike to access.
The Gap itself is a small, forested pass with meadows at 5,000 feet of elevation. From here it is possible to do a thru-hike out Waptus River or simply turn around and head back the way you came.