Willow Spring was 16.39 miles, (26 km), south of Fort Hudson and the second crossing of the Devils River on the San Antonio-El Paso Road. It was the last water for travelers from the east on the road before Dead Mans Pass. The water of Gillis Springs, that flowed out of the Boquillas limestone, dried up in recent times.
- U.S. Geological Survey Geographic Names Information System: Gillis Springs
- Gunnar M. Brune, Springs of Texas, Volume 1, Texas A&M University Press, 2002, p.455
- Table of distances from Texas Almanac, 1859, Book, ca. 1859; digital images, (http://texashistory.unt.edu/ark:/67531/metapth123765/ accessed November 12, 2013), University of North Texas Libraries, The Portal to Texas History, http://texashistory.unt.edu; crediting Texas State Historical Association, Denton, Texas
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