Where the River Flows

Recently Stephen Von Worley created a series of beautiful maps, Crayon the Grids, in which the U.S.'s roads were colored by orientation. Andrew Hill has created a similar map of U.S. Rivers Colored by the Direction they Flow.

The map uses data from Nelson Minar's Vector River Map, which in turn uses river flow data from
NHDPlus. Andrew has also used the same river data to create another