As of February 1, 2008, the U.S. Board on Geographic Names had identified 5,564 natural streams in the State of Colorado. Of this number, 147 larger streams (2.6%) were named "river" and 11 (0.2%) were named "rio". The vast majority of the Colorado streams (5082 or 91.3%) were named "creek". Of the remaining Colorado streams, 122 (2.2%) were named "arroyo", 60 (1.1%) were named "wash", 44 (0.8%) were named "fork", 18 (0.3%) were named "branch", 17 (0.3%) were named "brook", 17 (0.3%) were named "run", 15 (0.3%) were named "rito", 10 (0.2%) were named "slough", but not a single stream was named "stream". Perhaps the strangest stream name in Colorado belongs to the West Fork East Fork Williams Fork located in Garfield County.