According to a worker at the scene the spill is related to an overflow originating from Montgomery County that exceeded the system capacity for this part of D.C..
Notice that “unknown” has been hand written over the quantity of sewage that was estimated from the last spill – 5 million gallons. The Fletcher Boathouse is closed.
The pictures were taken 5/17/2014
The “District” in “District of Columbia” can now be capitalized on second reference, AP said in a Stylebook update in March. (I didn’t notice it until AP reporter Ben Nuckols tweeted about it this morning; this change was overshadowed somewhat by AP’s shift on “over” and “more than,” one of the most important events in Stylebook history.)