“A dirt road linking the Pima Canyon Trailhead with the Pima Wash Trail, Mormon Loop Trail, and National Trail.”
— Hunter R
This dirt road is not special by any means, other than the fact that it connects you from the Pima Canyon Trailhead to awesome singletrack trails in the vicinity. On the road, expect a smooth, well-graded, and wide surface on which to run.
If you're looking for a singletrack option that parallels the dirt road, check out the Pima Wash Trail. However, be ready to run through some serious sand.