The Bill Williams
River is a 46.3-mile-long (74.5 km) river in western-central Arizona
in Mohave County
; the river proper is the northern border of La Paz County
which it drains in the north, as well as areas of far western Yavapai County
. It is a major drainage westwards into the Colorado River of the Lower Colorado River Valley south of Hoover Dam
/Lake Mead, and the drainage basin covers portions of northwest, and west central Arizona.
The Bill Williams River's confluence with the Colorado is north of Parker
, and south of Lake Havasu City
.The two tributaries to the Bill Williams are the Big Sandy River
and the Santa Maria River
. Alamo Lake is a major fishing and recreation region on the Bill Williams River.The city of Scottsdale
, Arizona, formerly owned a ranch on the river and planned to export water from it.