Crater Lake Reflections Visitor Guide Winter Spring 2019-2020

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National Park Service Crater Lake U.S. Department of the Interior Refections Visitor Guide Winter/Spring 2019-2020 Rotary plow at Rim Village One Lake, Many Moods Crater Lake is unpredictable. No matter how Clouds also create scenes of stunning drama. many times you’ve seen it before, you can When storms end, the lake’s features slowly never be sure exactly what to expect on your reveal themselves to fortunate onlookers. next visit to the rim. The lake’s appearance And once every few years, some lucky visitors is ever-changing and often surprising. This reach the rim to fnd a “smoking cauldron”— is especially true in the winter—perhaps the the crater flled with fog, under a blue sky (see best time of year to witness Crater Lake at its photo on back page). This occurs when cold, most wild and beautiful. moist air becomes trapped in the caldera during a temperature inversion. The lake’s character depends partly on the wind. On many winter days, strong winds Sometimes, too, Crater Lake is masked by ice. whip across the water. The strongest gusts It forms along the shore during cold snaps. materialize as whitecaps and can be seen Seeing the lake entirely frozen over, however, Keeping the Park marching, like angry armies, across the width is a once-in-a-lifetime experience (the lake’s of the lake. Calm days in the winter are few tremendous depth makes its surface freeze- Open is “Snow” and far between, but, when they occur, the resistant). In 1949, the last time the lake Snowshoe with a scene is entirely diferent. The lake becomes became ice-bound, it froze for 2½ months Easy Task a mirror and refects the sky in perfect and a thick layer of snow accumulated on top. Park Ranger symmetry; the air is so quiet you can hear a Typically, though, seeing bergs of snow and What were you doing at 4:00 am this Ranger-led snowshoe walks are a fun way morning? If you were a member of the pine needle drop. ice in the water is simply an indication that an to experience the winter wonderland of Crater Lake roads crew, you might have avalanche has recently occurred on the inner Crater Lake National Park. This winter, if been reporting for duty! The lake’s appearance (and frequent walls of the caldera. staffng and snow conditions allow, they disappearance) also depends on cloud cover. will take place on Saturdays, Sundays, and Trying to keep Highway 62 and the road Nearly 50% of the time in the winter and With so many variables (and we haven’t holidays from November 23 through April to Rim Village open year-round is no easy early spring, storms completely hide the lake even mentioned the color of the water, 26. Walks will also likely be offered daily task. Each day, the park’s heavy equipment from view. While disappointing for visitors which can vary from bright blue to slate from December 21 through January 5 operators work from 4:00 am to 8:00 pm, who have driven hours to get here, it’s during gray, with hues of red, orange, and purple (except on Christmas Day) and from March in two different shifts, clearing snow and these periods of rain and snow that the lake at sunrise and sunset), Crater Lake is never 20 through March 29. Snowshoes are sanding roads. During heavy storms, snow is replenished. Crater Lake wouldn’t be the same lake twice. And thank goodness! Its provided free of charge and no previous removal can become a 24-hour operation, America’s deepest lake without such wet unpredictability is one of its fnest attributes, snowshoeing experience is necessary. with crews working 12 hours at a time. winters, which dump an average of 43 feet one that makes visiting (and re-visiting) the (13 meters) of snow at Park Headquarters. park such a delightful and rewarding activity. The walks start at 1:00 pm, last 2 hours, “It can be a hazardous job,” reports one and cover 1 to 2 miles (1.6–3.2 km) of hilly operator, “especially when it’s dark and terrain. The route is up to the ranger, but white-out conditions are occurring. On a most walks begin at Rim Village and explore The surface of Crater Lake winding mountain road, you never know the forests and meadows along the rim of rarely freezes. During cold what’s around the next corner. It could be snaps, however, fngers of ice the caldera. Along the way, participants a tree across the road at windshield level, sometimes probe from the discover how winter affects Crater Lake a car stuck in the snow, or an avalanche.” shore out over the abyss. and the park’s plants and animals. Snow plows were frst used at Crater Lake Space on each tour is limited, and advance in 1930. Prior to that, crews used shovels reservations are recommended. You can and dynamite to clear the roads each sign up at the Steel Visitor Center or by Rangers use a giant spring. Today, the park employs 6 operators “ruler” to measure calling 541-594-3100. Participants must and 2 mechanics who use both push plows snow depth at Park be at least 8 years old, healthy enough for and rotary plows. The rotary plows are Headquarters. They’ve a moderate-to-strenuous hike, and have equipped with a fan that can shoot snow measured snow depth warm clothing and water-resistant footwear. 75 to 80 feet (24 meters) into the air. To and snowfall at this control where the snow lands, the operator location since 1931. Scout troops, hiking clubs, and other can vary the angle and volume of output. Most years, as in this organized groups of 10 or more people photo, the mid-winter may be able to arrange for their own The amount of snow moved each winter snowpack exceeds 10 ranger-led walk (staff permitting). Group by the park’s roads crew is astounding. feet (3 meters) deep, walks are available on weekdays as well as but last winter, it never (continued on back page) on weekends. touched the 4-foot (1.2-meter) mark. The park is central to the cultural traditions of Park Profle local American Indian tribes, whose ancestors Watch the Park Film witnessed the lake’s formation. Crater Lake National Park protects the deepest Curious to learn more about Crater Lake? lake in the United States. Fed by rain and snow Today, old-growth forests blanket the volcano’s Stop by the Steel Visitor Center to watch the (but no rivers or streams), the lake is considered outer slopes, harboring more than 700 native park’s 22-minute introductory flm, shown every to be the cleanest and clearest large body of plant species and a wide variety of animals, half hour. It explores the park’s signifcance water in the world. including several that are rare or endangered. and the wonder that Crater Lake has inspired for generations. The flm, entitled Crater Lake: The lake rests inside a caldera formed • Park established: 1902 Into the Deep, includes dramatic underwater 7,700 years ago when a 12,000-foot-tall • Size: 183,000 acres (74,060 hectares) footage along with state-of-the-art animation (3,600-meter) volcano collapsed following • Annual visitation: 700,000 people that depicts the lake’s violent, volcanic past. a major eruption. The eruption may have • Lake depth: 1,943 feet (592 meters) been the largest in North America in the past • Lake width: 4.5 to 6 miles (7 to 10 km) 640,000 years. Later eruptions formed Wizard • Lake volume: 5 trillion gallons (19 tr. liters) Island, a cinder cone near the southwest shore. • Last time the lake froze over: 1949 Regional Map Winter Recr National Park Service Bend U.S. Dept. of the Interior Eugene NATIONAL Crater Lake Snowmobile FORESTS 20 Route 58 Steel Llao Rock Bay 97 8049ft Crater Lake Visitor Guide North Junction 2453m Winter/Spring 2019-2020 7025ft 5 2142m Llao Bay This is the offcial trip-planner and newspaper 138 of Crater Lake National Park. It is published Chemult Diamond Lake Diamond Lake Devils -1788ft twice a year and funded by the Crater Lake Overlook Backbone -545m Roseburg 138 Crater Lake Natural History Association through sales 230 National Park Watchman Overlook l made in the visitor center bookstore. e North Entrance Road n Union Creek n & Rim Drive are a Watchman Peak h C Park Mailing Address: CLOSED in winter 8013ft Wizard Prospect 62 l Crater to automobiles 2442m l Island Crater Lake National Park e Elevation at lake level: 62 k PO Box 7 Fort S 6173ft Klamath Union Peak Overlook 6940ft Crater Lake, OR 97604 Grants Chiloquin 2116m 1882m 234 NATIONAL Pass 62 FORESTS Phone: 541-594-3000 97 Lightning Wizard Medford Springs Trail -1548ft Website: www.nps.gov/crla Island -472m Email: [email protected] 199 Klamath Falls Overlook Ashland Discovery Point Rim Village Rim Café & Gift Shop Accessibility visitor center for a list 7100ft The Steel Visitor Center of accommodations 2165m Hemlock Loop and Rim Village Café & outside the park. Pacific West Rim Drive Raven Trail Gift Shop are accessible Roads & Travel Crest to people with mobility Lost & Found Trail impairments. Weather Report lost & found The park is open year-round, 24 Village is also kept open as much Dutton Creek Trail permitting, partial views items to the Steel Visitor Garfield hours a day. Some roads, trails, as possible (typically about 80% Castle Creek of Crater Lake can be Center or call the park’s Park Peak and facilities, however, are closed of the time in the winter), but it’s 8054ft enjoyed from the top lost & found offce at Headquarters 2455m foor of the gift shop, 541-594-3060.
Recommended publications
  • Foundation Document Crater Lake National Park Oregon August 2015

    Foundation Document Crater Lake National Park Oregon August 2015

    NATIONAL PARK SERVICE • U.S. DEPARTMENT OF THE INTERIOR Foundation Document Crater Lake National Park Oregon August 2015 Signatur es 8-7-2015 Foundation Document To Diamond Lake, Roseburg, and 5 Pacifc Crest National Visitor center Gasoline 0 1 2 3 4 5 Kilometers Scenic Trail (PCT) 0 1 2 3 4 5 Miles Other hiking trail Lodging Picnic area North Food service Campground UMPQUA NATIONAL Pets are prohibited Beaver on all hiking trails. Meadows Store Backcountry campsite FOREST Offroad driving is (permit required) prohibited. Cree Showers k 230 k or ) ( F ver st Rogue Ri Cascade Mountain Pass 138 Ea Lake West North Entrance Station To Bend, Eugene, and 97 To Medford and 5 Boundary Springs l i a r T c i North Entrance Road n e ROGUE RIVER c S l NATIONAL a n o i FOREST t a PUMICE DESERT N t s e r C c WINEMA if c Pa NATIONAL Oasis Butte FOREST CRATER LAKE NATIONAL PARK Red Cone Sphagnum Bog Red Cone Spring ic Trail en Cleetwood Cove Trail c S l a n o i t a Steel East N R Bay t i m s North Junction e r D C r c f i Grotto c a Cove P Watchman Overlook Crater Lake WIZARD ISLAND Cloudcap Overlook Cloudcap Lightning Bay Spring W Rim Village e s Rim Village Café & Gift Shop MOUNT SCOTT t Phantom Ship Sinnott Memorial Overlook (highest point in park) R Overlook im Rim Village Visitor Center 8929ft Kerr Notch 2721m D Crater Lake Lodge Plaikni Falls To Medford r.
  • Crater Lake Reflections Summer-Fall 2018

    Crater Lake Reflections Summer-Fall 2018

    Crater Lake National Park National Park Service Crater Lake U.S. Department of the Interior Refections Visitor Guide Summer/Fall 2018 Park News 2 ... Camping, Lodging, Food Discovering Crater Lake 3 ... Ranger Programs f Water Restrictions in Effect Please help us conserve water during 12 Great Ways to Enjoy Your Stay 4 ... Hiking Trails your visit. In March, the state of 5 ... Driving Map Oregon declared a drought emergency The frst European-American to see Crater Lake was lucky to ... In the News: Bull Trout for our county. In 8 of the past 10 survive the experience. On June 12, 1853, gold prospector John 6 years, the park has received less snow Wesley Hillman was riding his mule up a long, sloping mountain. 7 ... Feature Article: Lake Level than normal. Last winter’s snow total He was lost, tired, and not paying attention to the terrain ahead. was 15 feet below average. While 8 ... Climate Chart Suddenly, his mule stopped. Hillman sat up and found himself you’re here, please take short showers, on the edge of a clif, gazing in astonishment at “the bluest and don’t run the tap, and reuse towels most beautiful body of water I had ever seen.” He added: “If and sheets if staying overnight in park Look Inside! I had been riding a blind mule, I frmly believe I would have lodging. Thanks for your help! ridden over the edge to death and destruction.” f Leave Your Drone at Home While mules—no matter how sharp their eyesight—are no longer Operating remote-controlled aircraft permitted to approach the rim of Crater Lake, there are many in the park is prohibited.
  • Crater Rim Historic District Hawaii Volcanoes National Park

    Crater Rim Historic District Hawaii Volcanoes National Park

    National Park Service Cultural Landscape Inventory 2006 Crater Rim Historic District Hawaii Volcanoes National Park Table of Contents Executive Summary...................................................................................................................................... 1 Park Information ........................................................................................................................................... 3 Property Level and CLI Number .................................................................................................................. 3 Completion Status......................................................................................................................................... 3 Landscape Description.................................................................................................................................. 4 CLI Hierarchy Description ........................................................................................................................... 5 Location Map................................................................................................................................................ 5 Boundary Description ................................................................................................................................... 6 Regional Context .......................................................................................................................................... 6 Site Plans......................................................................................................................................................
  • West Hawai'i Covers

    West Hawai'i Covers

    National Park Service U. S. Department of the Interior Crater Lake National Park Museum Management Plan Cultural Resources Pacific West Region August 2007 Crater Lake National Park Museum Management Planning Team Mary Benterou, Park Curator Crater Lake National Park Crater Lake, Oregon Kent Bush, Regional Curator, Retd. Pacific West Region Seattle, Washington (Team Leader) Kelly Cahill, Park Curator North Cascades National Park Marblemount, Washington Rick Cronenberger, Historical Architect, RA Cultural Collections Consultant Intermountain Region Denver, Colorado Scott E. Foss, Ph.D., Park Curator John Day Fossil Beds National Monument John Day, Oregon Department of the Interior National Park Service Pacific West Region 2007 Crater Lake National Park Museum Management Plan August 2007 Executive Summary The Crater Lake National Park Museum Management Plan outlines a series of issues concerning the development, management, and use of the park archives, library, and museum collections (hereafter referred to as “the collections”), and it recommends corresponding actions to address these issues. A Collections Management Plan (CMP) (precursor to the current Museum Management Plan format) was completed in 1995, and the park has had the services of a journeyman-level curator for 12 years. Despite the age and maturity of the park, these park-specific resources remain in a developmental stage. They lack status, definition, and support, and thus are not able to efficiently contribute to park operations. Few of the recommendations in the 1995 CMP have been implemented. With the continued influx of collections, the documentation program and physical facilities are in worse condition now than in 1995. These deficiencies could be corrected by the following actions: • Developing internal protocols to govern collections growth, processing, and access.
  • Crater Lake National Park Oregon

    Crater Lake National Park Oregon

    DEPARTMENT OF THE INTERIOR HUBERT WORK. SECRETARY NATIONAL PARK SERVICE STEPHEN T. MATHER. DIRECTOR RULES AND REGULATIONS CRATER LAKE NATIONAL PARK OREGON PALISADE POINT, MOUNT SCOTT IN THE DISTANCE 1923 Season from July 1 to September 30 THE PHANTOM SHIP. FISHING IS EXCELLENT IN CRATER LAKE. THE NATIONAL PARKS AT A GLANCE. [Number, 19; total area, 11,372 square miles.] Area in National parks in Distinctive characteristics. order of creation. Location. squaro miles. Hot Springs Middle Arkansas li 40 hot springs possessing curative properties- 1832 Many hotels and boarding houses—20 bath­ houses under public control. Yellowstone Northwestern Wyo­ 3.348 More geysers than in all rest of world together- 1872 ming. Boiling springs—Mud volcanoes—Petrified for­ ests—Grand Canyon of the Yellowstone, remark­ able for gorgeous coloring—Large lakes—Many largo streams and waterfalls—Vast wilderness, greatest wild bird and animal preserve in world— Exceptional trout fishing. Sequoia. Middle eastern Cali­ 252 The Big Tree National Park—several hundred 1S90 fornia. sequoia trees over 10 feet in diameter, some 25 to 36 feet, hi diameter—Towering mountain ranges- Startling precipices—Mile long cave of delicate beauty." Yosemito Middle eastern Cali­ 1,125 Valley of world-famed beauty—Lofty chits—Ro­ 1890 fornia. mantic vistas—Many waterfalls of extraordinary height—3 groves of big trees—High Sierra— Waterwhcol falls—Good trout fishing. General Grant Middle eastern Cali­ 4 Created to preserve the celebrated General Grant 1S90 fornia. Tree, 3* feet in diameter—6 miles from Sequoia National Park. Mount Rainier ... West central Wash­ 321 Largest accessible single peak glacier system—28 1899 ington.
  • USGS Scientific Investigations Map 2832, Pamphlet

    USGS Scientific Investigations Map 2832, Pamphlet

    Geologic Map of Mount Mazama and Crater Lake Caldera, Oregon By Charles R. Bacon Pamphlet to accompany Scientific Investigations Map 2832 View from the south-southwest rim of Crater Lake caldera showing the caldera wall from Hillman Peak on the west to Cleetwood Cove on the north. Crater Lake fills half of the 8- by 10-km-diameter caldera formed during the climactic eruption of Mount Mazama volcano approximately 7,700 years ago. Volcanic rocks exposed in the caldera walls and on the flanks record over 400,000 years of eruptive history. The exposed cinder cone and andesite lava flows on Wizard Island represent only 2 percent of the total volume of postcaldera volcanic rock that is largely covered by Crater Lake. Beyond Wizard Island, the great cliff of Llao Rock, rhyodacite lava emplaced 100–200 years before the caldera-forming eruption, dominates the northwest caldera wall where andesite lava flows at the lakeshore are approximately 150,000 years old. 2008 U.S. Department of the Interior U.S. Geological Survey This page intentionally left blank. CONTENTS Introduction . 1 Physiography and access . 1 Methods . 1 Geologic setting . 4 Eruptive history . 5 Regional volcanism . 6 Pre-Mazama silicic rocks . 6 Mount Mazama . 7 Preclimactic rhyodacites . 9 The climactic eruption . 10 Postcaldera volcanism . .11 Submerged caldera walls and floor . .11 Glaciation . .11 Geothermal phenomena . 12 Hazards . 13 Volcanic hazards . 13 Earthquake hazards . 14 Acknowledgments . 14 Description of map units . 14 Sedimentary deposits . 15 Volcanic rocks . 15 Regional volcanism, northwest . 15 Regional volcanism, southwest . 17 Mount Mazama . 20 Regional volcanism, east . 38 References cited .
  • Rogue Gorge (Mt

    Rogue Gorge (Mt

    Rogue Gorge (Mt. Stella) Roadless Area-- T30S R3E (primarily in portions of Sections 23, 26, 33, 34 & 35) Rogue River-Siskiyou National Forest--High Cascades Ranger District Upper, higher elevation trail provides two expansive summit top views of the Crater Lake Rim and crest of the southern Cascades. Additionally, two, lower, old growth-lined trails closely parallel the upper Rogue River within this same roadless area. A longer 7 mile, (north-south) river trail, follows just above the Rogue River’s westside. While a shorter 3.5 mile trail provides easy access opportunities on the opposite shore to outstanding riverside views of the geologically remarkable “Rogue Gorge” and “Natural Bridge”— the latter being the southern access to the riverside portion of this remarkable roadless area. All 4 recommended hikes (described below) in this most varied roadless area are easily accessible from the main Crater Lake Hwy. 62 (& Hwy. 230). Also, nearby and outside this proposed Wilderness area are 3 local area campgrounds, a restaurant, rustic cabins, and a small store. Upper Rogue River along trail #1034A at the confluence with Union Creek. Rogue Gorge Roadless Area—Page 2 The 2,300 acres Rogue Gorge proposed Wilderness area, bordered along its east side by the upper Rogue River, provides unspoiled vistas along the river and the Crater Lake/Rogue-Umpqua Scenic Highway. The lower elevations of this old growth dominated, riverside roadless area provide a scenic backdrop for the Forest Service’s Farewell Bend and Union Creek Campgrounds, as well as the geologically remarkable “Rogue (River) Gorge”. All described trailheads below are located just off the Crater Lake Highway 62-230, immediately north and south of the 56 mile post at Union Creek (private restaurant and resort).
  • Rim Drive Rehabilitation Revegetation Project 2017 Annual Report

    Rim Drive Rehabilitation Revegetation Project 2017 Annual Report

    National Park Service U.S. Department of the Interior Crater Lake National Park Rim Drive Rehabilitation Revegetation Project 2017 Annual Report ON THIS PAGE Working on site documentation for the Rim Drive Rehabilitation project. Photograph by Carrie Wyler. ON THE COVER Collecting native plant seed for restoration while the Spruce Fire plumes in the background. Photograph by Carrie Wyler. Rim Drive Rehabilitation Revegetation Project 2017 Annual Report Carolyn S. Wyler, Tara L. Chizinski, Scott E. Heisler, Melody C. Frederic, and Jennifer S. Hooke National Park Service Crater Lake National Park P.O. Box 7 Crater Lake, Oregon, 97604 April 2018 U.S. Department of the Interior National Park Service Crater Lake National Park Crater Lake, Oregon i This annual report series is intended for the timely release of basic data sets and data summaries. Care has been taken to assure accuracy of raw data values, but a thorough analysis and interpretation of the data has not been completed. Consequently, the initial analyses of data in this report are provisional and subject to change. All manuscripts in the series receive the appropriate level of peer review to ensure that the information is scientifically credible, technically accurate, appropriately written for the intended audience, and designed and published in a professional manner. This report received informal peer review by a subject matter expert who was not directly involved in the collection, analysis, or reporting of the data. Views, statements, findings, conclusions, recommendations, and data in this report do not necessarily reflect views and policies of the National Park Service, U.S. Department of the Interior.
  • FY 2022 National Park Service

    FY 2022 National Park Service

    The United States BUDGET Department of the Interior JUSTIFICATIONS and Performance Information Fiscal Year 2022 NATIONAL PARK SERVICE NOTICE: These budget justifications are prepared for the Interior, Environment and Related Agencies Appropriations Subcommittees. Approval for release of the justifications prior to their printing in the public record of the Subcommittee hearings may be obtained through the Office of Budget of the Department of the Interior. Printed on Recycled Paper THIS PAGE INTENTIONALLY LEFT BLANK National Park Service FY 2022 Budget Justifications Department of the Interior NATIONAL PARK SERVICE FISCAL YEAR 2022 BUDGET JUSTIFICATIONS TABLE OF CONTENTS SECTION PAGE Overview, Tables, and Highlights NPS General Statement ................................................................................................................ Overview-1 Organization Chart ..................................................................................................................... Overview-17 National Park System Units ....................................................................................................... Overview-18 Park Visitation and Acreage ...................................................................................................... Overview-22 Unit Designations and Other Abbreviations .............................................................................. Overview-30 Budget at a Glance ....................................................................................................................
  • Mount Mazama and Crater Lake: a Study of the Botanical and Human Responses to a Geologic Event

    Mount Mazama and Crater Lake: a Study of the Botanical and Human Responses to a Geologic Event

    AN ABSTRACT OF THE THESIS OF Robyn A. Green for the degree of Master of Arts in Interdisciplinary Studies in Geology. Botany and Plant Pathology. and Anthropology presented on June 3. 1998. Title: Mount Mazama and Crater Lake: A Study of the Botanical and Human Responses to a Geologic Event Abstract approved: / Robert J. Lillie Crater Lake, located in the southern Cascade mountains of Oregon, is the seventh deepest lake in the world. Unlike a majority of the deepest lakes in the world, found in continental rift valleys, Crater Lake is in the caldera of a volcano. For the young at heart and mind, those willing to descend (and ascend) about 700 feet to Cleetwood Cove can undertake a boat tour of Crater Lake. From the boat, Crater Lake is more than just a beautiful blue lake; it becomes the inside of a volcano, where the response of people and plants to a geologic event can be investigated. The catastrophic eruption of Mount Mazama 7,700 years ago affected both plant and human populations. Before pumice and ash from the volcano blanketed the landscape like freshly fallen snow, the forests to the east of Mount Mazama were dominated by ponderosa and lodgepole pine. Within the immediate vicinity of the volcano all life was obliterated; the force of the eruptive material toppled vegetation and buried it with ash and pumice. Through the recovery process of succession, life has slowly returned to Crater Lake. Forests surrounding the lake are now dominated by mountain hemlock, whitebark pine, and lodgepole pine. These plants not only depict the process of succession, but also of adaptation to a volcanic environment.
  • Crater Lake U.S

    Crater Lake U.S

    National Park Service Crater Lake U.S. Department of the Interior Refections Visitor Guide Summer/Fall 2017 Park News 2 ... Camping, Lodging, Food Visit the Sinnott Overlook 3 ... Ranger Programs f Water Restrictions in Effect Please help us conserve water during Plus 10 Other Ways to Enjoy Your Park 4 ... Hiking Trails your visit. The park’s ability to provide 5 ... Driving Map water is currently restricted as we The Sinnott Memorial Overlook ofers one of the ... In the News: Bull Trout transition from a surface water source fnest views of Crater Lake. You can peer down a 6 to a groundwater well. If you’re sheer drop of nearly 900 feet (274 meters) to the 7 ... Feature Article: Lake Level reading this before arriving, please shore! It also features the park’s best exhibits. A small stock up on water outside the park. 8 ... Climate Chart museum describes the lake’s geology, formation, and While you’re here, please take short exploration. (Of special interest is the original device showers, don’t run the tap, and reuse used by scientists to measure the lake’s depth in 1886.) towels and sheets if staying overnight Look Inside! in park lodging. Thanks for your help! Finding this special viewpoint can be a challenge. f Leave Your Drone at Home It’s hidden behind the Rim Visitor Center, perched on a promontory 50 feet (15 meters) below the rim. Operating remote-controlled aircraft Landscape architect Merel Sager, who oversaw in the park is prohibited. Please report Park Profle violators to the nearest employee.
  • Ore Bin / Oregon Geology Magazine / Journal

    Ore Bin / Oregon Geology Magazine / Journal

    The ORE BIN Volume 28, No.9 September, 1966 FULGURITES FROM MOUNT THIELSEN, OREGON By William B. Purdom Southern Oregon College, Ashland, Oregon Fulgurites are natural glasses formed where lightning strikes bare rock or sand. They are the result of a very large electrical discharge between the earth and clouds. The potential difference necessary for such a discharge results when minute droplets of water condense on dust particles in the atmosphere. These droplets grow until the limit of cohesion is exceeded (when the drop has a diameter of about 4mm), after which they are torn apart by rapidly ascend­ ing air currents. The smaller, lighter fragments are carried to the top of the cloud, losing electrons as the result of friction. Thus the upper portion of the cloud becomes positively charged, and the lower portion negatively charged, and an electrical potential difference exists between the top and bottom of the cloud. The earth itself becomes charged by induction and the electrons in the earth become concentrated on any protuberances on the surface. If the electrical potential difference between oppositely charged por­ tions of the cloud or between the cloud and the earth become great enough, discharge occurs in the form of an immense spark. The critical potential difference is generally in the range of 20 to 30 million volts. It has recent­ ly been ascertained that these discharges occur in 10 microseconds or less (Orville, 1966). High-speed photographs reveal that the stroke starts as a thin leader passing between different parts of the cloud or between cloud and earth.