I like to take it through the tunnel (no... not like that... you are dirty!)

Washington Area Bicyclist Association (WABA)
5 hrs · Edited · 
More good news! DDOT and the Park Service are one major step closer to rebuilding the Rock Creek Park Trail!
http://www.waba.org/blog/2014/06/a-rebuilt-rock-creek-park-trail-is-one-step-closer/
A Rebuilt Rock Creek Park Trail is One Step Closer | Washington Area Bicyclist Association
A Rebuilt Rock Creek Park Trail is One Step CloserJune 26, 2014 | Greg BillingTrail rehabilitation would including widening the trail through the tunnel. Photo credit:...
WABA.ORG