This spring I re-hiked the American Discover Trail section 4, Foresthill to Auburn, and part of section 5, Auburn to Folsom. My purpose was to create a GPS track for ADT-4, which I had already tried twice and failed to do. I used my new iPhone 5C to create the track, but I hadn’t yet figured out how to maximize battery life, so it ran out about 2/3 of the way through. So I returned yet again to finish off the last 1/3 to Auburn. I’ve glued the GPS tracks back together using Adze on my Macintosh. Of course any time out on the trail is time well spent, and in re-doing this section, it has come to seem quite familiar and is now a favorite.
The ADT splits from the Western States trail just downstream of Ruck-A-Chucky campground, and then rejoins at the Mountain Quarries Railroad bridge. The ADT goes up on Foresthill ridge and then gradually descends back to the confluence of the Middle Fork and North Fork American River. Part of the route is along (new) Foresthill Road, part along (old) Foresthill Road, and the trail itself is partly on (old, old) Foresthill Road. The walk along Foresthill Road is quite unpleasant, with traffic whizzing along at 65 mph or more, and even the less trafficked (old) Foresthill Road is not pleasant. I looked for an alternative route to (old) Foresthill Road, but unfortunately there is not one. Several possible trails start off but then veer away. I will explore more in the future to see if there is a bypass for Foresthill Road. If you want a more natural experience, stick with the Western States trail, which descends and crosses the river, possible only at moderate to low water, of course.
I had been calling the river between the confluence and Folsom reservoir the American River, but apparently it is traditional to call this section the North Fork American River, all the way to the junction with the South Fork American River, now under Folsom reservoir.