It wasn't actually wiki..........but i took it from here.......

A river of slime runs under Constitution Avenue - Greater ...

greatergreaterwashington.org/.../a-river-of-slime-runs-under-constitution...

Feb 28, 2012 - How is Washington, DC like this scene from Ghostbusters 2? ... In other words, Constitution Avenue was once a river. ... DC's canal connection into the C&O began at the Rock Creek Basin and followed 27th Street down until it ...