This trail is actually an old dirt road, wide open with lots of room for lots of people. Along the way you can view some impressive Depression-era stonework retaining walls ... and some killer views of the Indian Peaks. With a steady 7% grade, this sucka will get you in shape for those all-day epics come summertime.
Welcome to the Switzerland Trail of America, an old railroad grade that once connected many of the mining camps in Boulder County. History buffs should start here: http://en.wikipedia.org/wiki/Switzerland_Trail. We’ve divided the Trail into North and South sections because they are not typically ridden at the same time.
Pennsylvania Gulch 4WD road (95J) begins where the South section of Switzerland Trail begins-In the townsite of Sunset as it intersects Fourmile Road (also called Wall Street). After passing by the North section of the Switzerland Trail on Fourmile Road, bear left pass the "Sunset" sign and follow west. When the road splits, veer right on the old unmarked road (95J?). This is Penn Gulch. The South Section of Switz Trail is to the left.
This ride is one of the funnest stretches of creekside singletrack in Boulder County...followed by a heinous climb up to Miller Rock. From the trailhead you ride downhill following narrow, twisty singletrack - super flowy with the occasional tough technical move. And don't fall on those technical spots either as the steep drop to South St. Vrain Creek has claimed more than a few collarbones over the years.