Richard from DC on 9/11/2017 6:34:16 AM:
The towpath ends under the elevated Whitehurst Freeway in Georgetown.  There is plenty of street parking.  It has parking meters.  But since it's a deadend, you can double park while you load bikes onto a car.  There is also street parking for miles in all directions.  If you are asking where you can leave a car for an extended period, there are parking lots although they are rather expensive.