Qualla: Natural Bridge Caverns

Natural Bridge Caverns: Introduction

Fri, 06 Feb 2026 00:00:00 GMT

Photo credit Gaberlunzi, CC BY-SA 3.0. Four students from St. Mary's University in San Antonio went looking for caves on a spring day in 1960 and found the largest commercial caverns in Texas. On their fourth trip into the darkness below a natural limestone bridge in Comal County, Orion Knox Jr., Preston Knodell Jr., Al Brandt, and Joe Cantu explored over a thousand feet of passage that no human being had entered in modern history. They were not, however, the first visitors. During later excavation of the entrance trail, workers unearthed a human tooth, arrowheads, and spearheads dating to 5000 BCE, along with the jawbone and femur of an extinct species of black bear. The cavern had been a shelter for thousands of years before the limestone roof above it collapsed, creating the sinkhole that gives the place its name -- a flat slab of rock left hanging across the void like a bridge to nowhere.

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Image: Gaberlunzi | CC BY-SA 3.0

Natural Bridge Caverns: A World at 99 Percent Humidity

Fri, 06 Feb 2026 00:00:00 GMT

Photo credit Tim Wilson from Blaine, MN, USA, CC BY 2.0. The environment inside Natural Bridge Caverns is constant and extreme. The temperature holds steady year-round. The humidity sits at 99 percent, every day, in every passage. This perpetual dampness is what keeps the cave alive. Rainwater filters through the porous limestone of th...

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Image: Tim Wilson from Blaine, MN, USA | CC BY 2.0

Natural Bridge Caverns: A Family Affair Since 1963

Fri, 06 Feb 2026 00:00:00 GMT

Photo credit jdeeringdavis from San Francisco, CA, USA, CC BY 2.0. After the 1960 discovery, Knox connected the landowners with Jack Burch, a cave developer who had just finished work on the Caverns of Sonora in west Texas. Clara Wuest Knox dropped out of school to help. Burch agreed to take on the project, and development began in early 1963. C...

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Image: jdeeringdavis from San Francisco, CA, USA | CC BY 2.0

Natural Bridge Caverns: The Jaremy Room and Beyond

Fri, 06 Feb 2026 00:00:00 GMT

Photo credit Rei at en.wikipedia, CC BY-SA 3.0. In 1967, speculation about a southern extension of the known cavern was confirmed when test drilling hit a large void deep beneath the surface. A camera lowered through a narrow shaft revealed a massive chamber filled with formations. The shaft was widened, and three men were low...

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Image: Rei at en.wikipedia | CC BY-SA 3.0

Natural Bridge Caverns: Seven Thousand Years of Shelter

Fri, 06 Feb 2026 00:00:00 GMT

Photo credit Jonathunder, Public domain. The archeological record at Natural Bridge Caverns reaches back at least seven millennia. The arrowheads and spearheads found during entrance construction date to 5000 BCE, placing early inhabitants squarely in the Archaic period of Texas prehistory. The extinct black bear remain...

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Image: Jonathunder | Public domain