Flickr user dullshick brings us this great photo of 7th St. and Pennsylvania Ave. during the flood of 1889, found in the archive of the Prints and Photography Reading Room at the Library of Congress. This flood affected many across the region, setting records and generally wreaking havoc. You can read more about the flood from the History of the Johnstown Flood (hat tip to Flickr user rockcreek). EXIF.