Cub Run

There is currently two pipe bridge crossings that are a must scout before you run. The first one is just down from the route 29 bridge and the other is at the foot crossing next to big rocky run. I found a link that describes what all of the construction is all about. Check out:
http://www.fairfaxunderground.com/forum/read/2/432493/432508.html
I am not sure if they are going to remove the pipe bridges but the construction is scheduled to be complete by the fall of 2011.