The Capitol Riverfront is accessible from highways I-395 and I-295, New Jersey Avenue SE, M Street SE via Maine Avenue, South Capitol Street, and 8th Street, SE.  Check out MapQuest or Google Maps for specific driving directions. 

Estimated Drive Times
You may view estimated drive times from various regional locations here. (NOTE: Drive times are estimates from Google Maps, low end is with no traffic, high end is estimate with traffic).

The Capitol Riverfront has metered parking on the streets and several surface parking lots with hourly, daily, and monthly rates:

Streets--For a map of metered streets and residential restrictions, please click here.
Parking Lots--Click here for a map of all public parking lot options.
Nationals Parking Lots--A map of Nationals official public parking lots is available here.