The area on the west end of McPhee Reservoir on the Dolores River in southwest Colorado is known as the Sage Hen area. Running straight north for 4.3 miles from Sage Hen is the very rutted and rough Forest Road 500, leading to the McPhee Dolores River Dam site. This Forest Road has been closed to motorized vehicles since 2008.
Descending into Lone Dome Canyon through a side canyon, the Dolores River discharging from the dam flows west. The Dolores River State Wildlife area protects the river through this area. The forest on the north facing canyon wall has Ponderosa Pines and Douglas Firs.