Several street closures are in effect this morning in Foggy Bottom due to a water main break in the area. Two westbound lanes on Pennsylvania Ave. NW at 20th Street are closed, as are parts of I Street between 20th and 21st NW, and all southbound lanes at the intersection of 21st and K streets NW. Authorities expect the general vicinity of 21st Street between K and Pennsylvania to remain a mess throughout the morning. MORE: DC WASA spokesperson Alan Heymann tells DCist the water main in question was installed all the way back in 1859. That’s some old main!