From NPS:
“Rock Creek Park maintenance workers and the D.C. Water and Sewer Authority will be performing emergency manhole cover and collar replacement and repair on Beach Drive Nov. 2-3, 2010. Beach Drive will be closed from the Rock Creek and Potomac Parkway to Klingle Road, NW, from 9:30 a.m. until 2:30 p.m. each day to provide space for the equipment and allow personnel to work safely.”