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Colorado River, river rising in western Texas, U.S., on the Llano Estacado (ā€œStaked Plainā€) in Dawson county, northeast of Lamesa. It flows generally southeastward past Colorado City, through rolling prairie and rugged hill and canyon country. By means of the Highland Lakes, six reservoirs—Buchanan, Inks, Lyndon B. Johnson, Marble Falls, Travis, and Austin—impounded by as many dams, the river flows past Austin and across the Coastal Plain to enter Matagorda Bay (an inlet of the...