Entirely within Texas, this Colorado River has its origins near
Lamesa and empties into the Gulf of Mexico in Matagorda County below
Bay City. Near its start, it forms Lake Thomas, then near
Robert Lee it fills E.V. Spence Reservoir. It fills O.H. Ivie Reservoir near
Ballinger and forms Lake Buchanan near
Buchanan Dam before passing through
Austin and forming Lake Walter E. Long. It then makes a gentle southeast curve to its outlet.
