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68-1107: The Virgin Valley begins as the Virgin River exits the Virgin River Gorge between the Beaver Dam Mountains and Wilderness north, and the northeast of the Virgin Mountains on the south of the Gorge. Lake Mead on the Virgin River extends slightly upstream into the Virgin Valley. There are two Virgin Valleys in Nevada. This article is mostly about the Southern valley, which is Northeast of Las Vegas along I-15. The Northern valley

136-526: A Scottish VIII, 8 using traditional climbing protection, would be similar in difficulty to a bolted sport climbing M8. The most important grading system in mountaineering is the International French Adjectival System (IFAS) (or French Alpine System, FAS), which is also effectively the "UIAA Scale of Overall Difficulty" (they are the same, only differing in labels), and which is used in all forms of alpine climbing around

204-454: A V6 crux ). In aid climbing (i.e. the opposite of free climbing), the most widely used system is the A-grade system (e.g. A3+), which was recalibrated in the 1990s as the "new wave" system from the legacy A-grade system. For "clean aid climbing" (i.e. aid climbing equipment is used but only where the equipment is temporary and not permanently hammered into the rock), the most common system

272-653: A broader "Scale of Global Assessment" for alpine climbing (the French Alpine System), and created the "UIAA Scale of Overall Difficulty" by assigning Roman numerals I–VI to the six adjectival levels (e.g. F, PD, AD, D, TD, and ED) of the French system. The UIAA also incorporated a "Scale of Difficulty in Aided Climbing" for aid routes with the levels: A1, A2, A3, A4, and (later) A5. In 1978, the UIAA added

340-420: A climb graded (VI, 8) denotes the hardest move is above the overall grade. This dual grade is needed as Scottish winter climbs use traditional climbing protection, placing greater strains on the climber. British climber Ian Parnell wrote in his guide to Scottish winter climbing that Scottish grades are almost two levels above M-grades, and thus a Scottish (VIII, 8) is similar to an M6; but that an onsight of

408-468: A dual-grading system – similar to the British E-grade – with a Roman numeral denoting the "overall" difficulty (e.g. technical challenge, length, and the level of boldness/physicality/stamina required). A second Arabic number grades the technical difficulty of the hardest move on the route. A climb graded (VI, 6) means the difficulty of the hardest move is standard for the overall grade, whereas

476-586: A full American YDS "X", or essentially a free solo route). Similarly, E3 6a implies a well-protected route, while E2 or E1 6a would imply easily available bomb-proof protection. The two main boulder grading systems are the French Font-grade and the American V-grade systems. Beyond the easiest grades, the two systems can be almost exactly aligned in comparison tables . For people who have little experience with outdoor climbing, it

544-575: A route has no ice, and not even the "thin ice coating" common on Scottish Winter routes, it is increasingly common to use a D-grade to indicate dry-tooling . Some M-graded routes in "dry" areas (i.e. places like the American Rockies, but not Scotland), are more of a combination of a WI-graded ice route with a D-graded dry-tooling route. The most dominant ice climbing system is the WI (for "water ice") grading system. WI-grades broadly equate to

612-471: A single longer bouldering route have been graded as if they were sport climbs. A notable example is the 2004 boulder route The Wheel of Life , which is graded V15  (8C) as a boulder route, but also f9a (5.14d) as a sport climbing route. The Font-grade (from the " Fontainebleau climbing area ") is one of the oldest boulder grading systems whose origins can be traced back to at least 1960 with Michel Libert's L'Abbatoir at Fontainebleau. The Font-scale

680-404: A small number of grading systems have become internationally dominant for each type of climbing, which has contributed to the standardization of grades worldwide. Over the years, grades have consistently risen in all forms of climbing, helped by improvements in climbing technique and equipment . In free climbing (i.e. climbing rock routes with no aid), the most widely used grading systems are

748-599: A story for the San Francisco Chronicle . She became known as the "Opal Queen" owning the Rainbow, Stonetree and Bonanza mines and the "Giant Tree" Opal Claim. She sold the latter in about 1918 and concentrated on the Rainbow and Bonanza mines. The Virgin Valley is about 25 miles (40 km) long. Upstream in the valley's northeast, Littlefield, AZ is located at the exit of the Virgin River Gorge , as well as two outfalls from two washes that flow south from

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816-641: Is French 9c. While the French system became the dominant scale in Europe, the UIAA scale is still popular in Germany, Austria, Switzerland, Czech Republic, Slovakia, and Hungary. The UIAA scale is also commonly found in the grading systems of alpine climbing routes, and particularly those that use the French Alpine System (e.g. PD, D, TD, ED), where the UIAA scale is often used to grade the free climbing component. The most complex grading system

884-507: Is a typical technical grade for a standard route. For example, E4 is often associated with 6a, so E4 6a means the route has a normal level of risk and other related factors for its technical level of 6a. However, E5 6a would imply that the risk is higher (i.e. closer to an American YDS "R"), while E6 6a would imply a very significant risk (i.e. like the American YDS R/X), and a rare E7 6a would be effectively no protection (i.e.

952-586: Is a long canyon carved out by the Virgin River in northwest Arizona . The Virgin River created the topography of both Zion National Park and the Virgin River Gorge. Interstate 15 runs through the canyon and crosses the Virgin River several times. The Virgin River Gorge section of Interstate 15 is one of the most expensive parts of interstate highway ever constructed. Due to the winding of

1020-468: Is about 45m long, the first 20m are about 8b [French sport] climbing with a couple of really really good knee-bars. Then comes the crux boulder problem, 10 moves of 8C [French boulder]. And when I say 8C boulder problem, I really mean it. ... I reckon just linking 8C [French boulder] into 8B [French boulder] into 7C [French boulder] is a 9b+ [French] sport climb, I'm pretty sure about that. In addition, boulder routes that connected various boulder problems into

1088-511: Is also noted that boulder grades on indoor climbing walls tend to feel softer than the equivalent outdoor grades up until about V10 / Font 7C+ (since people climbing at that level generally have plenty of outdoor experience). As of September 2023, the hardest bouldering route in the world is Burden of Dreams in Lappnor in Finland, which is graded 9A (Font) and V17 (V-grade/Hueco), and was

1156-496: Is an "adjectival grade" that covers the overall difficulty of the route and takes into account the: "seriousness, sustainedness, technical difficulty, exposure, strenuousness, rock quality, and any other less tangible aspects which lend difficulty to a pitch". This adjectival grade uses the labels (starting from the easiest): M (moderate), D (difficult), VD (very difficult), HVD (hard very difficult), S (severe), HS (hard severe), VS (very severe), and HVS (hard very severe). After HVS,

1224-411: Is an open-ended scale that starts at 1 and increases in single-digit steps but uses a "+" for additional refinement between steps; from grade 6 it introduces a capitalized "A", "B" and "C" for further refinement, and was at 9A in 2023 with Burden of Dreams . The Font-scale has no regard to any risk and is purely focused on the technical difficulty of the movements. The Font-scale is distinguished from

1292-568: Is done as pure dry-tooling , which is ice climbing on bare rock with no ice section, the M-grade is usually replaced by a "D" grade prefix (but all other aspects of the two systems are identical). The most extreme dry-tooling route in 2023 is Parallel World (D16) in the "Tomorrow's World Cave" in the Dolomites . Mixed climbing in Scotland is known as "Scottish Winter climbing" and uses

1360-489: Is identical to the "UIAA Scale of Overall Difficulty" (e.g. I–VI)–is used to grade the "overall" risk and difficulty of mountain routes (with the gradient of the snow/ice fields) (e.g. the 1938 Heckmair Route on the Eiger is graded: ED2 (IFAS), VI− (UIAA), A0 (A-grade), WI4 (WI-grade), 60° slope). The related "commitment grade" systems include the notable American National Climbing Classification System (e.g. I–VI). In 1894,

1428-548: Is in the Hanshelleren Cave , in Flatanger Municipality , Norway; the severely overhanging Silence is graded 9c (French), 5.15d (American YDS), and XII+ (UIAA), and is the first-ever climb to have those grades in history. The French numerical system for free climbing was developed from the UIAA scale in the 1980s but uses Arabic numbers instead of the UIAA scale's Roman numerals, and also uses

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1496-589: Is less common to find traditional climbing routes graded by the French system, and thus it is also called the French sport grade . To avoid confusion between French grades and the British E-grades, a lowercase "f" (for French) is used as a prefix (e.g. f6a+); this should not be confused with the use of the capitalized "F" or "fb" prefix in Font boulder grades . The American YDS (or 'Yosemite Decimal System')

1564-470: Is not normally overhanging, aside from Helmecken Falls routes). M-grades do not take into account the "danger" of the route (i.e. how good is the protection in the event of a fall) as they are mostly pre-bolted routes; they, therefore, focus on the technical and physical challenge of the route, and is thus more akin to the French and American free climbing rock grades, although as with the American system,

1632-565: Is on the opposite end of the State near the Oregon border. The two valleys are approximately 600 miles apart. The Opal mines are located in the Northern valley. The Virgin Valley has mines that are rich in opals . The opals were discovered in about 1913. The richest mines were owned by Flora Haines Loughead who had been a writer and a farmer but bought a string of claims after being sent to do

1700-404: Is that his publisher would not print the book without some kind of rating of his 900 routes. The V-scale is an open-ended scale that starts at V0 (although a slightly easier "VB" has been used for beginners), and increases in single-digit steps (i.e. V5, V6, V7), and was at V17 in 2023 with Burden of Dreams . The V-scale doesn't consider risk and is purely focused on the technical difficulty of

1768-728: Is the British E-grade system (or British trad grade ), which uses two separate open-ended grades for each route. This structure is particularly adapted to traditional climbing routes (which are more common in Britain), but it is still considered complex and unlike the American YDS system (which has the R/X labels for traditional climbing routes), never came into wider use for traditional climbing outside of Britain. Within Britain,

1836-518: Is the C-system (e.g. C3+). Aid climbing grades take time to stabilize as successive repeats of aid climbing routes can materially reduce the grade. In ice climbing , the most widely used grading system is the WI ("water ice") system (e.g. WI6) and the identical AI ("alpine ice") system (e.g. AI6). The related sport of mixed climbing (i.e. ice and dry-tool climbing) uses the M-grade system (e.g. M8), with other notable mixed grading systems including

1904-467: Is used instead for "alpine ice", which is year-round and usually firmer, more stable, making AI-grade routes slightly easier than WI routes. In 2010, ice climbers began to put up new ice routes at Helmcken Falls in Canada that had unique characteristics. Unlike the sheerest WI7 ice routes, these routes were significantly overhanging like extreme M-graded routes. This was due to the intense spray from

1972-431: Is used. This confusion is amplified by the tendency for modern sport-climbers to describe the crux moves on their routes in terms of their bouldering grades – their routes are effectively a series of connected boulder problems. For example, here is Adam Ondra describing his 2017 redpoint of Silence , the first-ever free climb in the world to carry a grade of 9c (French), 5.15d (American), XII+ (UIAA): The climb

2040-489: The French sport grade by using capitalized letters (i.e. Font 6C+ vs. f6c+), and also the use of "Fb" or capital "F" (for "Font") as a prefix. The distinction is important as the scales are very different (i.e. Fb6C+ is closer to f7c). The V-grade (short for "Vermin" or "Verm", and also known as the "Hueco" scale) was first published in 1991 by American bouldering pioneer John "Verm" Sherman in his climbing guidebook , Hueco Tanks Climbing and Bouldering Guide . Legend

2108-474: The French sport grade is more popular for British bolted sport climbing routes. As of April 2024, the highest consensus E-grade on a traditional route in Britain was on Lexicon (E11 7a) and on Rhapsody (E11 7a), which are considered equivalent to American 5.14 R or French f8b+/f8c+. Outside of Britain, the highest consensus E-grade was Bon Voyage in Annot, France at E12, or 5.14d / 9a. The first grade

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2176-498: The first-ever boulder to reach those grades. The Font-grade system is easily confused with the French sport grade and the British E-grade systems as they use similar symbols, however, boulder grades are very different from free climbing grades and they start at much harder technical levels. For example, the entry-level Font-grade 4 / V-grade V0 is equivalent to the free climbing grades of 6a to 6a+ (French), VI to VII− (UIAA), and 5.9 to 5.10c (American YDS), depending on what table

2244-482: The " R/X " suffix is used for danger. In his 1996 book, Ice World , mixed climbing pioneer Jeff Lowe ranked his new M-grades to the level of physical exertion needed on a free rock climb; for example, Lowe estimated that M8 was equivalent to 5.12 (American YDS). Other authors have tried to align M-grades with rock climbing grades, and now equate M8 to 5.10/5.11, however, there is some variation and no consensus that such comparisons are valid. When mixed climbing

2312-570: The "A" suffix is replaced by a "C" to denote "clean climbing". In Yosemite, an "F" suffix is placed after the "C" if fixed gear (e.g. bolts) is required to go clean (or hammerless). The most dominant system internationally for ice climbing is the WI-grade, while the most dominant international system for mixed climbing is the M-grade (with the Scottish Winter grade also notable given the unique nature of Scottish mixed routes). Where

2380-459: The "PG-13" is usually omitted as it is considered the default). A suffix of " R " is added where protection is inadequate and any fall could risk serious injury, and " X " for routes with little or no protection and where any fall could be very long and potentially fatal (i.e. also known as a " chop route "). American big wall climbing routes will often include the NCCS grade (Levels I–VII) with

2448-438: The "seventh grade" was added—though climbers had been climbing at that level for years—and by 1985 it was formally made into an open-ended scale that went beyond Grade VII. The UIAA scale is closely aligned with the French system up to Grade V+, which is French grade 6a, but thereafter begins to diverge, although the two can be reasonably aligned in comparison tables . The UIAA scale was at XII+ in 2023 with Silence , which

2516-472: The 1990s as "new-wave" grades – dominated aid grading. The two main free climbing grading systems (which include the two main free climbing disciplines of sport climbing and traditional climbing ) are the "French numerical system" and the "American YDS system". The "UIAA scale" is still popular in Germany and across parts of Central Europe. Many countries with a history of free climbing have also developed their own free climbing grading systems including

2584-470: The American YDS system, an " R/X " suffix is sometimes used alongside the WI-grade to grade additional risks. The WI-grade is for "hard ice"; steep snow slopes, which are encountered frequently on alpine climbing routes, are not explicitly graded but instead, their steepest angle (approximate figure or a range) is quoted (e.g. 60–70 degree slope). WI-grade is for "seasonal" hard ice; an AI prefix

2652-592: The American system, French system, and latterly the "UIAA scale" became popular internationally (with the American and French dominating sport climbing). The UIAA "Scale of Overall Assessment" dropped its six Roman numbers in favor of the six adjectival grades of the French Alpine System (to avoid confusion with the "UIAA scale") and dominated alpine climbing grading, while the UIAA "Scale of Difficulty in Aided Climbing" – amended and expanded in Yosemite in

2720-478: The Austrian mountaineer Fritz Benesch  [ de ] introduced the first known climbing grading system, which he introduced to rock climbing. The "Benesch scale" had seven levels of difficulty, with level VII the easiest and level I the hardest; as more difficult climbs were made, the grades of level 0 and level 00 were added. In 1923, German mountaineer Willo Welzenbach  [ de ] compressed

2788-728: The Beaver Dam Mountains. Mesquite, NV is downstream, and on Interstate 15 in Nevada , about 10 miles (16 km). Mesquite is the approximate center of the valley. The South Virgin Mountains are southeast of the Virgin Valley and Mountains, and separate the northern Overton Arm of Lake Mead from the Colorado River arm. The area north of the South Virgin Mountains is the Mormon Mesa ,

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2856-646: The British E-grade system (e.g. E4 6a). In bouldering (i.e. rock climbing on short routes), the most widely used systems are the American V-scale (or "Hueco") system (e.g. V14), and the French "Font" system (e.g. 8C+). The Font system often attaches an "F" prefix to further distinguish it from French sport climbing grades, which itself uses an "f" prefix (e.g. F8C+ vs. f8c+). It is increasingly common for sport climbing rock routes to describe their hardest technical movements in terms of their boulder grade (e.g. an f7a sport climbing route being described as having

2924-490: The British E-grade system and the Australia/New Zealand "Ewbank" system. The evolution of grade milestones in traditional climbing, and latterly sport climbing (as it took over from traditional climbing as the main focus of the leading free climbers), is an important part of the history of rock climbing . As of September 2023, the hardest free climb in the world is the sport climbing route Silence which

2992-430: The French grades, it does not also use the "+" refinement, and simply goes: 4a, 4b, 4c, 5a, 5b, 5c, 6a, ... etc.,). British climbers use the prefix "f" to distinguish French sport-grades from British technical grades, which is important as they are not equivalent (e.g. British 5c is f6b+). The secret to understanding the British E-grade system is the relationship between the two grades. For each adjectival grade there

3060-427: The French numerical or sport system (e.g. f7c+), the American YDS system (e.g. 5.13a), and latterly the UIAA scale (e.g. IX+). These systems are focused on technical difficulty, which is the main focus of the lower-risk activity of sport climbing . The American system adds an R/X suffix to traditional climbing routes to reflect the additional risks of climbing protection . Notable traditional climbing systems include

3128-455: The Scottish Winter system (e.g. Grade VII). Pure dry-tooling routes (i.e. ice tools with no ice) use the D-grade prefix (e.g. D8 instead of M8). In mountaineering and alpine climbing , the greater complexity of routes requires several grades to reflect the difficulties of the various rock, ice, and mixed climbing challenges. The International French Adjectival System (IFAS, e.g.TD+)–which

3196-541: The UIAA Roman numerals with Arabic numerals, and where French 6a equaled UIAA VI+. The two scales were summarised as "Plaisir Grades" and aligned in a UIAA table where French grades 1–6a aligned with "UIAA scale" grades I–VI+; beyond that level, the two systems diverged and for example, French 7a+ equates to UIAA grade VIII and French 9a equates to UIAA grade XI. In America, a version of the Welzenbach Scale

3264-459: The VII (seventh grade) to its "UIAA scale", implying that the scale was open-ended, a concept formally adopted in 1985. By the 1980s, French guides had customized the "UIAA scale" beyond V+ with the letters "a", "b", and c" (e.g. V+, VIa, VIb, etc.). At the end of the 1980s, French climbing guidebook author Francois Labande  [ fr ] published the "French numerical scale", which replaced

3332-456: The Virgin River Gorge, and called it Necessary Evil . Grade (climbing)#Free climbing Many climbing routes have a grade that reflects the technical difficulty—and in some cases the risks and commitment level—of the route. The first ascensionist can suggest a grade, but it will be amended to reflect the consensus view of subsequent ascents. While many countries with a strong tradition of climbing developed grading systems,

3400-631: The YDS grade (e.g. the Salathé Wall at 5.13b VI). The UIAA scale (or UIAA Scale of Difficulty) for free climbing was developed from the original "Welzenbach scale" in 1967 and uses the Roman numerals of that scale with "+" and "−" symbols for refinement between numerals after Grade III (i.e. III, IV−, IV, IV+, V−, V, V+ etc.,). Initially, the UIAA scale was closed-ended and went from Grade I (easiest) up to Grade VI (hardest), where it stopped. In 1978,

3468-547: The canyon, the highway within is also noted for its tricky driving conditions. The canyons climate is standard for the Mojave Desert with hot summers and mild winters. Flora and fauna in the canyon are also typical of the Mojave. The canyon is popular among rock climbers , hikers , and campers . In 1997, American rock climber Chris Sharma climbed America's first-ever 8c+  (5.14c) graded sport climbing route, in

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3536-483: The easiest grades, the two systems can be almost exactly aligned in comparison tables . The French system is an open-ended scale that was at 9c in 2023 with Silence . The system is only focused on the technical demands of the hardest movement on the route. Unlike the American YDS system, there is no allowance for any risks in the route, and thus the French system is more closely aligned with sport climbing (i.e. where pre-bolted protection removes some risk). It

3604-407: The impact of repeated ascents that subsequent aid climbing teams make to a route. It is not uncommon for a new A5 route in Yosemite to become a "beaten-out A3+ route" due to the effect of repeated hammering of cracks (which widens them), and to the build-up of permanent in-situ aid climbing equipment. The original "UIAA Scale of Difficulty in Aided Climbing" system went from A0 to A5 and focused on

3672-416: The label switches to E (extreme), but then rises as E1, E2, E3, E4, ... etc., in an open-ended scale. The second grade is a "technical grade" that focuses on the hardest technical movement on the route. This technical grade has a very similar format to the French sport grade , being an Arabic number that starts at 4 and uses the additional "a", "b", and "c" symbols for refinement between the numbers (unlike

3740-442: The letters "a", "b" and "c" and the "+" symbol to give additional refinement between the numbers (whereas the UIAA uses only the "−" and "+" symbols). The French system starts at 1 and closely aligns with the UIAA scale up to UIAA V+, which is French grade 6a, but thereafter begins to diverge. The French grading system is the dominant system in Europe, and it and the American YDS system are the most dominant systems worldwide; beyond

3808-488: The level of difficulties can vary significantly on long routes, and thus the use of aid in places is still common (e.g. The Nose on El Capitan is graded '5.9 (American) C2 (aid)' with aid, but an extremely difficult '5.14a (American)' without any aid; guidebooks will mark such routes as '5.9 & C2 (5.14a)', with the no-aid/fully free option in brackets. The grade of an aid climbing route can change materially over time due to improvements in aid equipment but also due to

3876-405: The mixed climbing M-grades from WI1 up to WI6/WI7, but after M6/M7, mixed climbs become overhanging, which ice does not. WI-grades try to take some account of the difficulty of placing protection on the route but, as with M-grades, are more focused on the technical and physical challenge of the route, and are thus more akin to the French and American YDS free climbing systems, although as with

3944-655: The movements. The V-scale is the dominant scale in North America, and it and the Font scale are the most dominant systems worldwide; beyond the easiest grades, the two systems can be almost exactly aligned in comparison tables . The main aid climbing systems are the A-grade (usually the "new wave" version) and the C-grade systems. While aid climbing is less popular as a standalone pursuit, aid techniques remain important in big wall climbing and alpine climbing, where

4012-428: The number and quality of "bodyweight placements" (i.e. can only take static bodyweight and not a falling bodyweight) versus "bombproof placements" on a given pitch. The grades were less concerned with the physical demands of the route (although there was some mention), and risk was only introduced later with A5. In the 1990s, Yosemite aid climbers created what they called a "new wave" aid grading system that expanded

4080-485: The numerical component of the American YDS system is focused on the hardest move on the route. In 1980, Jim Erickson introduced an additional rating for traditional climbing routes where the level and quality of the climbing protection is assessed. A suffix of "PG-13" (using the American cinema classification system ) denotes the climbing protection is adequate, and if properly placed a fall will be short (in practice,

4148-408: The range of the original UIAA system to A6 (they had already re-defined parts of the UIAA system), and introduced an intermediate "+" grade from A2 onwards for specific tricky or strenuous sections, and gave more detailed definitions at each grading level than the original A-grades. When the original or the "new wave" aid climbs can be ascended without the use of a hammer (for pitons or copperheads),

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4216-534: The scale and reversed the order so level 00 became level IV–V, and it became popular in the Alps. In 1967, the "Welzenbach scale" formally became the "UIAA scale" for rock climbing (or "UIAA Scale of Difficulty") with Roman numerals I–VI, and a "+" and "−" to refine each level. The UIAA also incorporated proposals made in 1943 by Lucien Devies  [ fr ] and the Groupe de Haute Montagne  [ fr ] on

4284-406: The scale continues upward (e.g. 5.10a, 5.10b, 5.10c, 5.10d, 5.11a, 5.11b, etc.,). The American YDS system is the dominant system in North America, and it and the French numerical system are the most dominant systems worldwide; beyond the easiest grades, they can be exactly aligned . The American YDS system is an open-ended scale that was at 5.15d in 2023 with Silence . Like the French system,

4352-648: The southwest border of Virgin Valley. Mormon Mesa is an extension south from the Mormon Mountains which are separated east from the Meadow Valley Wash tributary to north Lake Mead. The Virgin Valley is vertically bisected, north-south by the Nevada-Arizona border. The downstream Nevada half of the valley has the very beginnings of Lake Mead , about 20 miles (32 km) upstream, where the Virgin River used to flow. Littlefield, AZ in

4420-532: The valley's northeast is located at 36°54′0″N 113°56′0″W  /  36.90000°N 113.93333°W  / 36.90000; -113.93333 . Mesquite, NV in the valley's center is located at 36°48′9″N 114°4′56″W  /  36.80250°N 114.08222°W  / 36.80250; -114.08222 . Virgin River Gorge The Virgin River Gorge, located between St. George, Utah , and Beaver Dam, Arizona ,

4488-536: The waterfall, which covered the overhanging routes in ice so that there was little dry-tooling (i.e. all the movement was on hard ice). The routes were bolted like M-grade climbs and the result was a series of new WI-graded routes that laid claim as the "world's hardest ice routes"; by 2020, they reached WI13 with Mission to Mars . The grading of mixed climbing routes approximates the ice climbing WI grades, up to M6, but they then diverge as mixed routes can become very overhanging and eventually turn into roofs (ice

4556-434: Was developed independently by climbers at Tahquitz Peak who adapted the class 5 rating of Sierra Club Class 1–5 system in the 1950s. As a result, the system has a "5" as its prefix which is then followed by a decimal point and a number that starts at 1 and counts up with increasing difficulty (e.g. 5.4, 5.5, 5.6, etc.). At 5.10, the system adds the letters "a", "b", "c", and "d" as further refinements between levels, and

4624-594: Was introduced for rock climbing in 1937 by the Sierra Club , which in the 1950s was further adapted into the Yosemite Decimal System that added a decimal place to the class 5 grade (e.g. 5.2, 5.3, 5.4, etc.), and which by the 1960s was again amended to introduce the letters "a", "b", "c", and "d" after 5.9 to further refine the levels (e.g. 5.9, 5.10a, 5.10b, 5.10c, etc.). While individual countries developed their own rock climbing grading systems,

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