This route has historically been done for speed from the bottom of the bridge on the lake side.  Carly Wynn ran this in high school (July 6, 2010) in 25:02 and descended in 14:02 minutes (49:04).  Per Aaron Newell: "It was buried in my HS training logs and an enjoyable trip down memory lane."  There is not a GPS tracing available but for integrity of the route, this should be considered the time to beat! 

This is descriptions is adapted from the U.S. Forest Service (https://www.fs.usda.gov/recarea/lincoln/recarea/?recid=34408):