E-bikes NOT allowed on Upper Butte Loop
The Upper Butte Loop is accessible from the Lower Butte Loop and provides a challenging 13 mile ride around Black Butte. The trail travels through old growth ponderosa pine and mixed conifer as it circles the butte. When you approach the west and northwest sides, the ponderosa will give way to mixed conifer and sub-alpine vegetation. Occasional openings in the forest canopy will provide spectacular view of the Cascades.
Above description from the Sisters Country Trail Guide