Bill Williams River
Bill Williams National Wildlife Refuge, Arizona. The Bill Williams River drains more than 5,200 square miles of rugged, mountainous terrain in west-central Arizona. It is the largest tributary of the Colorado River between the Virgin and Gila Rivers. The name “Bill Williams River” is applied to the river segment extending from the confluence of the Big Sandy and Santa Maria Rivers to the Colorado River confluence at Lake Havasu.

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Photo by: Patrick Shafroth, US Geological Survey |  VIRIN: 060605-O-CE999-501.JPG