The Colorado trail From Kenosha Pass to Georgia Pass might be the best section of the Colorado Trail on the Front Range ! If it weren't for those mosquitoes ! West Jefferson Trail is a really fun somewhat technical downhill. It all depends on your ability. I have seen the whole thing ridden with only a dab or two bridges included!
From Kenosha Pass follow the Colorado trail to the West Jefferson Trail about 11 miles , just before the Georgia Pass summit . The first five miles of the Colorado Trail is rolling single track with lots of roots and a few technical sections and three bridges . The next six miles is a climb to timberline . It gets a little easier after lunch rock . I usually need lunch before this point!
West Jefferson Trail stars off with a ride across the alpine tundra then drops you down into the trees to a series of switchbacks then its some fast narrow singletrack down along the creek! The trail is very technical in places. Watch out for the bottomless mud holes!
When you reach the campground you can either ride through it or around on the horse trail. Pick up the trail on the other end of the campground, Follow this trail a short distance back to the Colorado Trail and ride back to Kenosha Pass . Now that rolling singletrack seems like all up hill!