This trail is actually an old section of the Alaska Highway that was decommissioned because of a few persistently reoccurring washouts. This trail will cross the large washout and continue along the old Alaska Highway crossing over a couple original bridges and passing by a small waterfall. The trail leads into an area called Petersen Canyon.
Take some time to look at the bridges as you cross over them. The design and construction of these are amazing considering their age. They were definitely meant to last. Also keep an eye out for the wooden culverts which were used in the original construction of the highway. Many are still in place and working while others are fully exposed because of washouts .
Difficulty: Moderately easy
Length: 12 km round trip – note that you can park a vehicle at both end if you wish to not backtrack.
See part of the trail in street view here.