to 5:00 p.m., monday through friday, people can enjoy the 2,300 foot walkway along the anacostia river. >> i think that's a pretty nice thing, especially at lunch time. something to do. >> yeah, something new. something -- the children and grandchildren, you can show them, have an outing for the kids. >> reporter: the walk runs along the back side of the navy yard, and was slated to open right around 9/11. the attack put everything on hold. new security systems were put in place, and this morning, the promenade opened for the first time. >> d.c. is for a long time wanted us to open up the river walk, and finally we have systems in place that allow us to have a safe environment, and secure the navy yard while giving the public access to the river walk. >> the new section rinks up with another stretch by the yards development. the navy display ship, the berry, is moored along the walk, so pedestrians can stroll up to the destroyer and take a tour. there are a few exceptions to the hours. for example, this section will not be open on weekends or federal holidays. also, the navy can restri