Ferguson landslide

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Ferguson Slide Ferguson-slide.jpg
Ferguson Slide

The Ferguson landslide, also commonly called the Ferguson Slide, is an active landslide in the Merced River canyon in Mariposa County, California, United States. In 2006, rocks and debris slid off Ferguson Ridge, blocking California State Route 140, a primary access road to Yosemite National Park. [1] The slide still blocked the original road as of late 2021, although temporary bridges allow one-way traffic around the slide and into the park. The slide is a natural phenomenon, and resulted from the erosion dynamics of the river valley. [2]

Contents

History

The slide began on April 29, 2006, and initially the highway remained open, with active monitoring and occasional temporary closures. By May 28, the road was closed permanently, stopping access to the park from Mariposa and severely impacting the local economy. Many park employees reside in Mariposa, and for several months a two-hour trip (one way) was required to get to work in the park. Revenue via the hospitality market dropped extensively, which included wages, profits to small business owners, and county government income from occupancy taxes. A State of Emergency was declared in June 2006 for Mariposa County. [2]

The downstream temporary bridge FergusonSlideBridge-2014-01-10.jpg
The downstream temporary bridge

Initially, two temporary bridges were built in August 2006. While this detour alleviated a significant portion of the economic impact to the area, vehicles over 28 feet could not use it. In June 2008, new temporary bridges which could accommodate longer vehicles were constructed. The detour via the bridges is one-way, controlled by traffic lights. At the height of the tourist season, this has sometimes resulted in significant delays. [2] The temporary bridges access a road grade on the north side of the Merced River, which is a vestige of the Yosemite Valley Railroad.

Repair of the highway was on permanent hold due to the encroachment of an endangered species into the slide area. In 2012, Assemblymember Kristin Olsen authored legislation that would allow the California Department of Fish and Game to do an initial take of the Limestone Salamander and place it in an Ecological Reserve. The legislation paved the way to restoring this important access route to Yosemite. Known officially as Assembly Bill No. 1973, it passed both houses of the California State Legislature and was signed into law by Gov. Governor Jerry Brown on July 13, 2012. [3] [4] After considering the option of a tunnel, Caltrans settled on a rock shed design in 2014. [5]

Ferguson Rock Shed

Caltrans plans to restore the original route of Highway 140 by building a protective rock shed, with construction split into two distinct projects: [6]

Construction on the rock shed is expected to begin in Fall 2022 and last five years. [6]

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<span class="mw-page-title-main">Yosemite Valley</span> Glacial valley in California, United States

Yosemite Valley is a glacial valley in Yosemite National Park in the western Sierra Nevada mountains of Central California, United States. The valley is about 7.5 mi (12.1 km) long and 3,000–3,500 ft (910–1,070 m) deep, surrounded by high granite summits such as Half Dome and El Capitan, and densely forested with pines. The valley is drained by the Merced River, and a multitude of streams and waterfalls flow into it, including Tenaya, Illilouette, Yosemite and Bridalveil Creeks. Yosemite Falls is the highest waterfall in North America and is a big attraction, especially in the spring, when the water flow is at its peak. The valley is renowned for its natural environment and is regarded as the centerpiece of Yosemite National Park.

<span class="mw-page-title-main">California State Route 1</span> State highway in California, United States

State Route 1 (SR 1) is a major north–south state highway that runs along most of the Pacific coastline of the U.S. state of California. At 656 miles (1,056 km), it is the longest state route in California, and the second-longest in the US after Montana Highway 200. SR 1 has several portions designated as either Pacific Coast Highway (PCH), Cabrillo Highway, Shoreline Highway, or Coast Highway. Its southern terminus is at Interstate 5 (I-5) near Dana Point in Orange County and its northern terminus is at U.S. Route 101 (US 101) near Leggett in Mendocino County. SR 1 also at times runs concurrently with US 101, most notably through a 54-mile (87 km) stretch in Ventura and Santa Barbara counties, and across the Golden Gate Bridge.

<span class="mw-page-title-main">Mariposa County, California</span> County in California, United States

Mariposa County is a county located in the U.S. state of California. As of the 2020 U.S. Census, the population was 17,131. The county seat is Mariposa. It is located in the western foothills of the Sierra Nevada mountains, north of Fresno, east of Merced, and southeast of Stockton.

<span class="mw-page-title-main">Oakhurst, California</span> Census-designated place in California, United States

Oakhurst is a census-designated place (CDP) in Madera County, California, United States, 14 miles (23 km) south of the entrance to Yosemite National Park, in the foothills of the Sierra Nevada. At an elevation of 2,274 ft (693 m), Oakhurst is situated at the junction of Highway 41 and Highway 49, marking the southern end of California's Gold Country. It is part of the Madera metropolitan statistical area.

<span class="mw-page-title-main">Mariposa, California</span> Census-designated place in California, United States

Mariposa is an unincorporated community and census-designated place (CDP) in and the county seat of Mariposa County, California, United States. The population was 1,526 at the 2020 census. The community is named after the flocks of monarch butterflies seen overwintering there by early explorers.

<span class="mw-page-title-main">California State Route 140</span> Highway in California

State Route 140 is a state highway in the U.S. state of California, 102 miles (164 km) in length. It begins in the San Joaquin Valley at Interstate 5 near Gustine, and runs east into Sierra Nevada, terminating in Yosemite National Park.

The State Scenic Highway System in the U.S. state of California is a list of highways, mainly state highways, that have been designated by the California Department of Transportation (Caltrans) as scenic highways. They are marked by the state flower, a California poppy, inside either a rectangle for state-maintained highways or a pentagon for county highways.

<span class="mw-page-title-main">History of the Yosemite area</span>

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<span class="mw-page-title-main">California State Route 41</span> Highway in California

State Route 41 is a state highway in the U.S. State of California, connecting the Central Coast with the San Joaquin Valley and the Sierra Nevada. Its southern terminus is at the Cabrillo Highway in Morro Bay, and its northern terminus is at SR 140 in Yosemite National Park. It has been constructed as an expressway from near SR 198 in Lemoore north to the south part of Fresno, where the Yosemite Freeway begins, passing along the east side of downtown and extending north into Madera County.

<span class="mw-page-title-main">California State Route 165</span> Highway in California

State Route 165 is a rural north–south state highway in the U.S. state of California. It runs in the San Joaquin Valley from Interstate 5 south of Los Banos to State Route 99 in Turlock.

<span class="mw-page-title-main">California State Route 132</span> Highway in California

State Route 132 is a state highway in the U.S. state of California that connects the Central Valley with the Sierra Nevada foothills and the California Gold Country. Its western segment also connects the city of Modesto with the San Francisco Bay Area via I-580, although this route is discouraged due to it being a two-lane road between Modesto and Interstate 5. East of Modesto, the road climbs the foothills and eventually ends at SR 49 at Coulterville.

<span class="mw-page-title-main">Yosemite West, California</span> Unincorporated community in California, United States

Yosemite West is an unincorporated community of resort homes located just outside the southern area of Yosemite National Park, just off Wawona Road, a continuation of State Route 41 from Fresno. It is a census-designated place (CDP), with a population of 47 as of the 2020 census. It is situated one mile (1.6 km) south of the Chinquapin intersection of Wawona Road with Glacier Point Road, at an altitude of 5,100 to 6,300 feet. The elevation reported by the USGS is 5,866 feet (1,788 m). The community is part of Henness Ridge, nearly 3,000 feet (910 m) above the southern banks of the Merced River and State Route 140 from Mariposa. Addresses in this area are shown as "Yosemite National Park, CA 95389".

<span class="mw-page-title-main">Yosemite Valley Railroad</span> Defunct railroad in California, USA

The Yosemite Valley Railroad (YVRR) was a short-line railroad that operated in California from 1907 to 1945, providing a new mode of travel and tourism for the region. It ran from Merced to the Yosemite National Park, but it did not extend to Yosemite Valley itself, as railroad construction was prohibited in the National Parks. Tourists would disembark at the park boundary in El Portal, California and stay overnight at the Hotel Del Portal before taking a stagecoach to Yosemite Valley.

<span class="mw-page-title-main">Yosemite Area Regional Transportation System</span> Public transit bus service in California, US

The Yosemite Area Regional Transportation System (YARTS) is a public transit bus line based in Merced, California. YARTS provides scheduled fixed route service between Yosemite National Park and gateway communities. Service operates year-round on Highway 140, providing access to Merced and Mariposa counties. During the peak summer months, additional service is added along Highway 120 providing access to Tuolumne County, Highway 41 providing access to Fresno and Madera counties, and eastern Highway 120/US 395 providing access to Mono County.

<span class="mw-page-title-main">1997 Merced River flood</span>

The January 1997 flood of the Merced River occurred from December 31, 1996, to January 5, 1997, throughout the Yosemite Valley in Yosemite National Park, Mariposa County, California, US. The flood stands as arguably the park's worst natural disaster to date, and inarguably the worst flood in park history. The Merced River at Happy Isles peaked at 10,100 cubic feet per second during the flood. A book was written on the flood later in 1997 by Mark Goodin titled Yosemite: The 100-Year Flood.

<span class="mw-page-title-main">1996 Yosemite Valley landslide</span> Natural landslide

The 1996 Yosemite Valley landslide occurred on July 10, 1996, near the Happy Isles trailhead in Yosemite Valley, Yosemite National Park, Mariposa County, California. 162,000 tons of rocks and other debris fell to the ground at over 160 miles per hour. Of the 12 campers/hikers involved in the incident, one was killed. The landslide competes with the 1997 Merced River flood and the 2013 Rim wildfire for the designation of the worst natural disaster in Yosemite to date. The earthquake caused by the rock slide was followed almost immediately by a sonic boom. Soon afterward a granite dust mushroom cloud formed over Happy Isles. The immense pressure created at the base of the rock slide blew down giant pine trees as if they were nothing. Afterwards the nearby campground tables and trees were covered with a thick coat of granite dust.

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<span class="mw-page-title-main">Rock shed</span> Road protection structure

A rock shed is a civil engineering structure used in mountainous areas where rock slides and land slides create highway closure problems. A rock shed is built over a roadway that is in the path of the slide. They are equally used to protect railroads. They are usually designed as a heavy reinforced concrete covering over the road, protecting the surface and vehicles from damage due to the falling rocks with a sloping surface to deflect slip material beyond the road, however an alternative is to include an impact-absorbing layer above the ceiling. A further use of this type of structure may be seen protecting the A4 road; although constructed primarily to alleviate risk from falling rocks from a limestone seam it also serves to protect against objects or persons falling from the Clifton Suspension Bridge where the height differential of approximately 70 metres from the bridge to the bottom of the Avon Gorge would give sufficient kinetic energy to even a relatively small item to cause injury on impact.

<span class="mw-page-title-main">Ferguson Fire</span> 2018 wildfire in Central California

The Ferguson Fire was a major wildfire in the Sierra National Forest, Stanislaus National Forest and Yosemite National Park in California in the United States. The fire was reported on July 13, 2018, burning 96,901 acres (392 km2), before it was 100% contained on August 19, 2018. Interior areas of the fire continued to smolder and burn until September 19, 2018, when InciWeb declared the fire to be inactive. The Ferguson Fire was caused by the superheated fragments of a faulty vehicle catalytic converter igniting vegetation. The fire, which burned mostly in inaccessible wildland areas of the national forest, impacted recreational activities in the area, including in Yosemite National Park, where Yosemite Valley and Wawona were closed. The Ferguson Fire caused at least $171.2 million in damages, with a suppression cost of $118.5 million and economic losses measuring $52.7 million. Two firefighters were killed and nineteen others were injured in the fire.

<span class="mw-page-title-main">Big Sur Coast Highway</span> Scenic section of California State Route 1

Big Sur Coast Highway is a section of California State Route 1 through the Big Sur region of California that is widely considered to be one of the most scenic driving routes in the United States, if not the world. It is both a National Scenic Highway and a California Scenic Highway, and was described by Australian painter Francis McComas as the "greatest meeting of land and water in the world". Condé Nast Traveler named State Route 1 through Big Sur one of the top ten world-famous streets, comparable to Broadway in New York City and the Champs-Élysées in Paris. The road itself is a destination for visitors.

References

  1. Bailey, Eric (January 8, 2007). "Nature reclaims Yosemite route". Los Angeles Times. Retrieved November 13, 2021.
  2. 1 2 3 DOT 2014.
  3. "Caltrans New Strategy for Ferguson Project in Mariposa County Could Result in Cost Savings". Sierra Sun Times. May 22, 2015. Retrieved November 13, 2021.
  4. "Bill Text - AB-1973 Protected species: take: Ferguson Slide Permanent Restoration Project" . Retrieved June 10, 2015.
  5. Skindrud 2014.
  6. 1 2 "Ferguson Rock Shed Project". California Department of Transportation. Retrieved November 13, 2021.
Attributions

37°39′24″N119°54′3″W / 37.65667°N 119.90083°W / 37.65667; -119.90083