 An open sewer channel drained into Kingman Lake through the middle of this tract, but a footbridge was constructed over it to link the two areas.Later that year, the Army Corps of Engineers spent $853,000 to extend Washington's sewer system to Bladensburg to collect raw sewage being dumped into the Anacostia River and Kingman Lake.In 1934, the Corps of Engineers transferred ownership of the Anacostia Flats and Kingman Lake to the National Park Service.