I've biked/run much of this trail. The trail head beginning in Ulen north to Twin Valley runs right along highway 32. Some sections are rutted grass cover only, the rest hard packed dirt/gravel paths. Gravel can be small class 5, to larger diameter rock. Low pressure in your tires helps. Not scenic. At the north end of Twin Valley, the trail veers off the highway with a few scenic bridge crossings, and some smaller grades to climb. Some sandy areas that can be hard to run/bike on closer to Fertile. All-in-all, this section is very pretty, and offers plenty of shade, and protection from wind.