• Grand Palace

    Great Basin

    National Park Nevada

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  • Road Work at Great Basin National Park

    Road work will create delays on the main park road going up to Lehman Caves Visitor Center and Wheeler Peak Scenic Drive. Wheeler Peak Campground will close at noon on September 2nd and portions of the Scenic Drive. Click more for details. Updated 8/25/14 More »

  • Snake Creek Road and Campsites Closed

    The Snake Creek Road will be closed from the park boundary into the park to begin work on campsites, trails and restroom improvements. Work will continue until snow closes the project. Work will resume in Spring 2015.

Algae Reduction

Algae growths in front of cave lights
Algae growing in the heat produced by cave lights
NPS PHOTO
 
Lehman Caves with with old lights

Lehman Caves as seen with incandescent bulbs

NPS PHOTO

As you take a tour of Lehman Caves, you might notice some green looking areas along the trail. Most people see this and immediately think they have discovered copper, but what you are seeing is in fact an unnatural algae growth that plagues show caves, including Lehman Caves.

The natural state of any cave is complete and total darkness. No light should exist deep within a cave system. Adding artificial lights to a cave upsets the delicate cave ecosystem, but are necessary to allow for people to safely enjoy these natural wonders. Since the first electric cave lights were installed in Lehman Caves in 1941, incandescent bulbs have been the lighting fixture of choice. Incandescent bulbs last an average of 200 hours, are fragile, operate at high temperatures and consume an average of 11,200 watts of power in the cave. They also give off yellow tinted light that hides the true color of cave formations and encourages algae growth.
 
Lehman Caves seen with LED lights

Lehman Caves viewed with LED lights

NPS PHOTO

Algae is problematic for cave ecosystems. Algae deposits introduce an invasive food source into the cave ecosystem, and greatly affect the natural balance of cave life. Algae growth can also harm the cave, as algae can permanently change the color of the cave, and even waterproof formations and prevent them from ever growing again.

During 2006, park staff have replaced the incandescent bulbs with Light Emitting
Diodes (LEDs). LEDs last an average of 50,000 hours, are resistant to shock, operate at low temperatures, and consume one third the amount of electricity. The truer color rendition of LED’s show off the caves wide range of colors and should reduce algae growth.
 
Cleaning algae deposits

Cleaning algae growths

NPS PHOTO

Even with LED lights, algae continues to grow. LED light emit enough heat which allows algae to grow, although at a slower rate. LED lights are still the right wavelength which allows these growths to continue. To control its growth, several methods can be adopted, including physical, chemical, and biological means. At this time, there is no ideal solution to this problem.

At Great Basin National Park and Lehman Caves, an active study is being completed within the cave system to determine which type of bulb, wattage, and wavelength of light best reduces algae growth , while still allowing for public enjoyment of this world class cave system. The current LED system has helped reduce the algae growth, but the problem still persists.

Until a more ideal lighting system is found, crews must regularly enter the cave to clean and remove the algae growths. Using nothing more than a spray bottle filled with a very diluted bleach solution, cave managers and volunteers meticulously wipe up these unnatural growths before they permanently damage the cave system.

Did You Know?

Golden Eagle

Migrating raptors, traveling south from breeding grounds north of the Great Basin Desert, concentrate along the Goshute Range in Nevada. Favorable migration conditions attract one of the largest known concentrations of migrant raptors in western North America.