Ruby Falls is an underground

waterfall A waterfall is any point in a river or stream where water flows over a vertical drop or a series of steep drops. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf. Waterfalls can be formed in seve ...

in Ruby Falls Cave, located at the end of an approximately 85 foot tall recessional gorge within

Lookout Mountain Lookout Mountain is a mountain ridge at the northwest corner of the U.S. state of Georgia, the northeast corner of Alabama, and along the southeastern Tennessee state line in Chattanooga. Lookout Mountain was the scene of the 18th-century "La ...

, in

Chattanooga, Tennessee Chattanooga ( ) is a city in Hamilton County, Tennessee, United States, and its county seat. It is located along the Tennessee River and borders Georgia (U.S. state), Georgia to the south. With a population of 181,099 in 2020, it is Tennessee ...

, in the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

. The cave is commercialized with electric lights, paved foot trails, and an elevator for access. The waterfall may only be visited by guided tour. Ruby Falls History.
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Geology

About 300 to 360 million years ago (in the

Carboniferous Period The Carboniferous ( ) is a geologic period and system of the Paleozoic era that spans 60 million years, from the end of the Devonian Period Ma (million years ago) to the beginning of the Permian Period, Ma. It is the fifth and penultimate perio ...

, at the end of the

Paleozoic Era The Paleozoic ( , , ; or Palaeozoic) Era is the first of three geological eras of the Phanerozoic Eon. Beginning 538.8 million years ago (Ma), it succeeds the Neoproterozoic (the last era of the Proterozoic Eon) and ends 251.9 Ma at the start of ...

), the eastern

Tennessee Tennessee (, ), officially the State of Tennessee, is a landlocked U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders Kentucky to the north, Virginia to the northeast, North Carolina t ...

area was covered with a shallow sea, the sediments of which eventually formed

limestone Limestone is a type of carbonate rock, carbonate sedimentary rock which is the main source of the material Lime (material), lime. It is composed mostly of the minerals calcite and aragonite, which are different Polymorphism (materials science) ...

rock.Ruby Falls Geology
/ref> About 200 million years ago, this area was uplifted, forming Lookout Mountain and nearby ridges. Slightly acidic groundwater running through cracks in the limestone slowly dissolved the relatively soluble rock, causing narrow cracks to widen into passages. This process, called

chemical weathering Weathering is the deterioration of rocks, soils and minerals (as well as wood and artificial materials) through contact with water, atmospheric gases, sunlight, and biological organisms. It occurs ''in situ'' (on-site, with little or no movem ...

, caused various caves to form inside

. Among them were Lookout Mountain Cave, which opened to the outside, and Ruby Falls Cave, which did not. The two were unconnected until developers joined them to create Lookout Mountain Caverns. Ruby Falls Cave is the upper of the two and contains a variety of geological formations and curiosities that Lookout Mountain Cave does not have. Ruby Falls Cave features many of the more well-known types of cave formations (or

speleothems A speleothem (; ) is a geological formation made by mineral deposits that accumulate over time in natural caves. Speleothems most commonly form in calcareous caves due to carbonate dissolution reactions. They can take a variety of forms, depend ...

) including

stalactites A stalactite (, ; , ) is a mineral formation that hangs from the ceiling of caves, hot springs, or man-made structures such as bridges and mines. Any material that is soluble and that can be deposited as a colloid, or is in suspension, or is ca ...

and

stalagmite A stalagmite (, ; ; ) is a type of rock formation that rises from the floor of a cave due to the accumulation of material deposited on the floor from ceiling drippings. Stalagmites are typically composed of calcium carbonate, but may consist ...

s, columns, drapery, and

flowstone Flowstones are sheetlike deposits of calcite or other carbonate minerals, formed where water flows down the walls or along the floors of a cave. They are typically found in "solution caves", in limestone, where they are the most common speleothe ...

. The limestone in which the cave is formed is still relatively horizontal, just as it was deposited below sea level. The Falls are located at the end of the main passage of Ruby Falls Cave, in a large vertical shaft. The underground waterfall and stream is fed by meteoric water (e.g.

rain Rain is a form of precipitation where water drop (liquid), droplets that have condensation, condensed from Water vapor#In Earth's atmosphere, atmospheric water vapor fall under gravity. Rain is a major component of the water cycle and is res ...

water) that percolates into the cave from the surface. It collects in a pool in the cave floor and then continues through the mountain, through a second deeper pit, and finally resurges as a natural spring to the

Tennessee River The Tennessee River is a long river located in the Southern United States, southeastern United States in the Tennessee Valley. Flowing through the states of Tennessee, Alabama, Mississippi, and Kentucky, it begins at the confluence of Fren ...

at the base of

. Like all caves in the region, the waterfall is naturally seasonally dependent and would be dry during certain times of the year. However, water is artificially circulated via pumps to maintain water flow year-round.

History

Ruby Falls Cave has no natural openings. It was discovered in 1928, and so lacks various artifacts often associated with caves in the southeastern

. In 1905, the natural entrance to Lookout Mountain Cave was closed during the construction of a railway tunnel. In the 1920s, a

chemist A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a graduated scientist trained in the study of chemistry, or an officially enrolled student in the field. Chemists study the composition of ...

and cave enthusiast named Leo Lambert thought that he could re-open the cave as a

tourist attraction A tourist attraction is a place of interest that tourists visit, typically for its inherent or exhibited natural or cultural value, historical significance, natural or built beauty, offering leisure and amusement. Types Places of natural beaut ...

, and formed a company to do so. He planned to make an opening farther up the mountain than the original opening and transport tourists to the cave via an

elevator An elevator (American English) or lift (Commonwealth English) is a machine that vertically transports people or freight between levels. They are typically powered by electric motors that drive traction cables and counterweight systems suc ...

. For this purpose, his company purchased land on the side of Lookout Mountain above Lookout Mountain Cave and in 1928 began to drill through the limestone. In doing so, they discovered a small passageway about 18 inches high and four feet wide. Exploring this opening, Lambert discovered the formerly hidden Ruby Falls Cave and its

. On his next trip to visit the cave, Lambert took his wife Ruby, and told her that he would name the falls after her. After the discovery of the cave housing Ruby Falls, the tunnelers kept digging to locate the original cave they were searching for, the Lookout Mountain caverns, which they reached 1,120 feet underground. On December 30, 1929 the Lookout Mountain caverns were open to the public, and by the following year in June the Ruby Falls cave was expanded and opened as well. By 1935 the lower of the two caves was blocked off due to Ruby Falls being the far more popular of the two caves. In 1954, the pathway around the basin was cut in order to allow tourists a better view of the falls. This began the tour-related quip regarding not drinking the falls' water. Though pure and thus safe to drink, it has large concentrations of

magnesium Magnesium is a chemical element; it has Symbol (chemistry), symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals (group 2 ...

from the strata of the mountain, which makes it a natural

laxative Laxatives, purgatives, or aperients are substances that loosen stools and increase bowel movements. They are used to treat and prevent constipation. Laxatives vary as to how they work and the side effects they may have. Certain stimulant, lubri ...

. In 1975, the secondary exit from the falls to the base of the mountain was cut. This was to comply with recreation regulations in Tennessee. The secondary exit is used in the event that the main shaft elevator fails. This secondary exit was used for the popular Ruby Falls Haunted Cavern until 2017 when the event was renamed Dread Hollow and was moved to a new location. The haunted attraction is open to the public from late September, through October. In April 2007, the

National Speleological Society The National Speleological Society (NSS) is an organization formed in 1941 to advance the exploration, conservation, study, and understanding of caves in the United States. Originally headquartered in Washington D.C., its current offices are in ...

(NSS) published "Caves of Chattanooga" by Larry E. Matthews. Chapter 3, "Ruby Falls Cave", covers the history of Ruby Falls Cave from its discovery in 1928 through 2007 (includes 23 illustrations). Chapter 1, "Lookout Mountain Cave", covers the cave Leo Lambert was drilling for when he accidentally discovered Ruby Falls Cave.

Tourism and advertising

Lambert decided to open both caves to the public, although Lookout Mountain Cave was closed in 1935 since it was not very popular with tourists, who were much more impressed with the upper cave. Public tours began in 1930. Electric lights were installed in the cave, making it one of the first commercial caves to be so outfitted. A large number of billboards were placed along I-75 in the 1970s and 1980s with the words "SEE RUBY FALLS" beginning hundreds of miles north and south of the falls itself. Ruby Falls remains a staple of

Chattanooga Chattanooga ( ) is a city in Hamilton County, Tennessee, United States, and its county seat. It is located along the Tennessee River and borders Georgia (U.S. state), Georgia to the south. With a population of 181,099 in 2020, it is Tennessee ...

tourism, operating daily. Ruby Falls and the larger Lookout Mountain Caverns complex have been designated a National Historic Landmark. It is often associated with the nearby Rock City attraction, which lies atop Lookout Mountain.

Popular culture references

Johnny Cash John R. Cash (born J. R. Cash; February 26, 1932 – September 12, 2003) was an American singer-songwriter. Most of his music contains themes of sorrow, moral tribulation, and redemption, especially songs from the later stages of his career. ...

and

Roy Orbison Roy Kelton Orbison (April 23, 1936 – December 6, 1988) was an American singer, songwriter, and guitarist known for his distinctive and powerful voice, complex song structures, and dark, emotional ballads. Orbison's most successful periods were ...

co-wrote a song with the title "See Ruby Fall" in the mid to late 1960s, a reference to the barn roof advertising slogan "See Ruby Falls" ubiquitous throughout the southern United States in the mid 20th Century.

Notes

External links