From a press release just sent to me:
"Beginning on Apr. 12, 2012 gates at the east and west end of the waterfront promenade (Riverwalk
) at the Washington Navy Yard
(WNY), will open for unlimited public access.
"The gates at both ends of the WNY Riverwalk will remain open for public access from dusk to dawn and will be open as a thoroughfare to facilitate access to the WNY and neighboring areas after sunset. There will be no loitering allowed between the hours of sunset and sunrise and the Riverwalk may close, without notice, to support WNY operations. [...]
"The Display Ship Barry, located along the WNY Riverwalk, will be open to the public with access directly from the Riverwalk during normal operating hours from 9 a.m. to 4 p.m. Monday through Friday and 10 a.m. to 5 p.m. on Saturday."
The release also quotes Naval Support Activity Washington commanding officer Cmdr. David Varner as saying that this is "supporting the community's desire to have a walkable riverfront."
(Note that April 12 is also the day of the Nats' home opener.)