This trail runs right by where I live. It goes from Great Falls down to the Occuquan Reservoir (from north to south across the county). It links up to trail systems in Great Falls Nat'l Park, Difficult Run Park, Little Difficult Run Park, Fountainhead, and other parks. It also links up to the WO&D trail which links up to other offroad trail systems. In my opinion, this is a pretty nice trail network, especially when you consider how populated the areas surrounding the trail are. Has a good mix of singletrack with decent climbs, downhill runs, stream crossings, and rock gardens mixed with some fireroads. It is pretty rooty and can be extremely muddy during certain times of the year. It is generally well maintained. Probably one of the better and more accessible trails in close proximity to DC.

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Reston to Great Falls and back - approximately 25 mi. round trip
If you have the time, do the entire thing from Great Falls to Occuquan...

Rode form Colvin Mill to Great falls and back (about 10 miles). Was a great time....Had some good challenges, lots of mud, and would consider it a great trail for someone getting into the sport.