Moro Rock

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Moro Rock
Moro Rock-View from Potwisha.jpg
View of Moro Rock from Potwisha (near Hospital Rock), Sequoia National Park
Elevation 6,725 ft (2,050 m)[1]
Prominence 245 ft (75 m)[1]
Location
Location Sequoia National Park, Tulare County, California, United States
Range Sierra Nevada
Coordinates 36°32′39″N 118°45′54″W / 36.54417°N 118.76500°W / 36.54417; -118.76500[2]
Topo map USGS Giant Forest
Geology
Type Granite dome
Age of rock Cretaceous
Climbing
First ascent 1861, by Hale Tharp, John Swanson and George Swanson
Easiest route Hike

Moro Rock is a granite dome rock formation in Sequoia National Park, California, USA. It is located in the center of the park, at the head of Moro Creek, between Giant Forest and Crescent Meadow. A stairway, designed by the National Park Service and built in the 1930s by the Civilian Conservation Corps, is cut into and poured onto the rock, so that visitors can hike to the top. The view from the rock encompasses much of the Park, including the Great Western Divide. Use of this trail is discouraged during thunderstorms and when it is snowing.

Vistas of the San Joaquin Valley are often disappointing, due to air pollution.[3]

Recreation[edit]

The road to Moro Rock is closed in winter, so visitors need to hike 2 miles to reach the viewpoint. The road is open in summer so the hike is shortened. The 1996 general plan for the park calls for the road to Moro to be closed, and replaced by a shuttle. As of June 2012, the road is open to general traffic only during weekdays; on weekends, the shuttle is running and the road is closed to general traffic.[4] The west face of Moro Rock offers 1,000 vertical feet of cracks and knobs for rock climbing. However, climbing is prohibited during peregrine falcon nesting season.[5]

Geology[edit]

Moro Rock is a dome-shaped granite monolith. Common in the Sierra Nevada, these domes form by exfoliation, the spalling or casting off in scales, plates, or sheets of rock layers on otherwise unjointed granite. Outward expansion of the granite results in exfoliations. Expansion results from load relief; when the overburden that once capped the granite has eroded away, the source of compression is removed and the granite slowly expands. Fractures that form during exfoliation tend to cut corners. This ultimately results in rounded dome-like forms.[6]

Stairway[edit]

Moro Rock Stairway
Built 1931
Architect National Park Service
Architectural style no style listed
Governing body National Park Service
NRHP Reference # 78000283
Added to NRHP December 29, 1978[7]

The first stairway leading to the summit of Moro Rock was constructed of wood and installed in 1917. This stairway deteriorated significantly by the late 1920s, and was replaced in 1931 by the present Moro Rock Stairway. Unlike the earlier stairway, the new stairway adopted a design policy of blending with the natural surfaces to the greatest extent possible. The 797-foot-long stairway was designed by National Park Service landscape architect Merel S. Sager and engineer Frank Diehl, following natural ledges and crevices. It has 400 steps that lead to the summit of Moro Rock.[8] Changes since the original construction have impaired the integrity of the design.[9]

References[edit]

  1. ^ a b "Moro Rock, California". Peakbagger.com. Retrieved 2009-01-14. 
  2. ^ "Moro Rock". Geographic Names Information System, U.S. Geological Survey. Retrieved 2009-01-14. 
  3. ^ Note: Air pollution is a subject of interpretative displays at the site.
  4. ^ "Moro Rock and Crescent Meadow". Sequoia and Kings Canyon National Park. National Park Service. 
  5. ^ "Rock Climbing". Sequoia and Kings Canyon National Park. National Park Service. 
  6. ^  This article incorporates public domain material from the National Park Service document "Geology Fieldnotes: Sequoia and Kings Canyon National Park".
  7. ^ "National Register Information System". National Register of Historic Places. National Park Service. 2008-04-15. 
  8. ^ "Moro Rock Stairway". List of Classified Structures. National Park Service. 2008-12-08. 
  9. ^ Tweed, William (May 20, 1977). "National Register of Historic Places Inventory - Nomination Form: Moro Rock Stairway". National Park Service. Retrieved 2 May 2012. 

External links[edit]