sidebar menu icon


PILOT KNOB (Travis County). Pilot Knob is a small summit (at 30°10' N, 97°42' W) on U.S. Highway 183 seven miles south of Austin in Travis County. It stands at an elevation of 711 feet above sea level, rising 100 to 150 feet above the surrounding countryside. Pilot Knob, formed at the bottom of a shallow sea about 80 million years ago, is said to be the only example of an exposed submarine volcano in Texas. A historical marker about this physical feature has been placed at the intersection of U.S. Highway 183 and Farm Road 1625.

Image Use Disclaimer

All copyrighted materials included within the Handbook of Texas Online are in accordance with Title 17 U.S.C. Section 107 related to Copyright and “Fair Use” for Non-Profit educational institutions, which permits the Texas State Historical Association (TSHA), to utilize copyrighted materials to further scholarship, education, and inform the public. The TSHA makes every effort to conform to the principles of fair use and to comply with copyright law.

For more information go to:

If you wish to use copyrighted material from this site for purposes of your own that go beyond fair use, you must obtain permission from the copyright owner.


The following, adapted from the Chicago Manual of Style, 15th edition, is the preferred citation for this article.

Handbook of Texas Online, "Pilot Knob (Travis County)," accessed December 18, 2017,

Uploaded on June 15, 2010. Published by the Texas State Historical Association.