Steam Mill Hollow is a loop ride high in Logan Canyon, a few miles up from Tony Grove. I haven't done this ride yet -- the photos, map, and GPS track on this page were created from material posted to our forum. (Thanks, guys! I'll get up there soon. Too many trails, too few days before the snow hits.)
This ride description gives you the bare basics.
Try not to get lost.
The ride starts on improved gravel road along the Logan River, 3.2 miles up-canyon on US-89 from the Tony Grove Lake road.
GPS track files (right-click and "Save as..."): GPX
High-res topo map (1 MB): View
Lodging, camping, shops: Links to Logan area resources