Description of the Blanco from

"The Blanco River rises in northeast Kendall County, then flows approximately 87 miles southeast through Blanco and Hays Counties, where it joins the San Marcos River. The upper section of the Blanco is noted for containing historic Indian mounds are unusual geologic formations. The lower section passes between bald cypress-lined banks and through areas of scenic beauty. For most of its length the river remains shallow and recreational use is feasible only for those sections where water has backed up behind low water dams. However, during periods of heavy run-off, the Blanco retains good water levels for recreational use. The feasibility of the Blanco for recreational use by the public may be limited since, for the most part, the streambed is privately owned. Interesting rapids and swift water are present for the entire length."

Source: Texas Parks and Wildlife