another article from seattle about the public mountain bike parks under the Interstatewww.thenewstribune.com
washington dc has some heavily eroded sections of trails on the hillside that would be perfect for this sort of development
I am sure that the National Park Service would object to any proposal with an immediate RUBBER STAMP NO!
but honestly...
they need to start fixing stuff up
but I would settle for some development of legal trails at FORT DUPONT
and of course
a pump course at Fort Dupont