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Trona, San Bernardino County, California

Unincorporated community
The Mosaic Company chemical plant dominates Trona
The Mosaic Company chemical plant dominates Trona
Trona is located in California
Location within the state of California
Country United States
State California
County San Bernardino
Time zone Pacific (PST) (UTC-8)
 • Summer (DST) PDT (UTC-7)
ZIP codes 93562

Trona is an unincorporated community in San Bernardino County, California. In 2000 it had a population of 2,742.[1] Trona is at the western edge of Searles Lake, a dry lake bed in Searles Valley, southwest of Death Valley. The town takes its name from the mineral trona, abundant in the lakebed. It is about 170 miles (274 km) northeast of Los Angeles, on State Route 178. The ZIP code is 93562.

Trona is known for its isolation and desolation,[2] as well as the nearby Trona Pinnacles. The local school plays on a dirt football field because the searing heat and highly saline soil kills grass. At one point it boasted an 18 hole golf course that was all sand except for the "greens", which were a softer grade of brown colored dirt.[3]


  • History 1
  • Geography 2
  • Climate 3
  • Politics 4
  • Views of Trona 5
  • References 6
  • External links 7


Trona abuts the dry Searles Lake bed

Starting in the late 1800s mining industry set up around Searles Dry Lake to mine borax.

Trona was officially established in 1913, as a self-contained company town, wholly operated by its resident mining company to house employees. Employees were paid in company scrip instead of cash. The mining company also built a library, a scrip-accepting for-profit grocery store, a school, basic housing, and minimal recreation facilities. The Trona Railway was built in 1913–14 to provide the town with a rail connection to the Southern Pacific (now the Union Pacific) line at Searles. The railway still operates today.

Economic booms and busts followed. Its most notable boom occurred during World War I, when Trona was the only reliable American source of potash, an important element used in the production of gunpowder.

Today, Searles Valley Minerals Inc.'s soda ash processing plant remains the largest firm in town. Other operations nearby include evaporative salt extraction from the dry lake bed's surface, and a lime quarry. Searles Valley Minerals is the largest employer in Trona, and many employees live in Ridgecrest, California, commuting daily to Trona.

Trona also serves as the headquarters and base of operations for the Trona Railway, a short-line railroad.

Trona High School's unique dirt football field

Trona High School has 162 students and competes as the Tornadoes. It has the only dirt American football field in the United States outside of Alaska.[2]

A number of Hollywood films have been shot in the surrounding desert (particularly around the Trona Pinnacles), including Star Trek V: The Final Frontier and Planet of the Apes.[2] In the 2000s, the town itself served as the setting for three films, Trona (2005), Just Add Water (2008) and Lost Lake (2012).[4]


The same collection of geologic forces which created the Searles Valley where Trona sits also created the natural resource of Searles Dry Lake, which contains rich deposits of chemicals, including dozens of minerals.[5]

Located a few miles to the south are the Trona Pinnacles, an unusual landscape consisting of more than 500 tufa spires, some as high as 140 feet, rising from the bed of the Searles Lake basin.


Trona has an arid climate with cool winters and hot summers. Average January temperatures are a maximum of 58.2 °F (14.6 °C) and a minimum of 32.9 °F (0.5 °C). Average July temperatures are a maximum of 105.5 °F (40.8 °C) and a minimum of 73.3 °F (22.9 °C). There are an average of 140.1 days with highs of 90 °F (32 °C) or higher and an average of 45.3 days with lows of 32 °F (0 °C) or lower. The record high temperature was 118 °F (48 °C) on August 13, 1933; July 25, 1943; May 27, 1951; and June 29, 1956. The record low temperature was 8 °F (−13 °C) on December 23, 1990.

Average annual precipitation is 3.98 inches (101 mm) and there an average of 18 days annually with measurable precipitation. The wettest year was 1941 with 9.01 inches (229 mm) and the driest year was 1953 with .41 inches (10 mm). The most precipitation in one month was 5.01 inches (127 mm) in January 1995. The most precipitation in 24 hours was 2.25 inches (57 mm) on August 15, 1984. Snowfall is very rare in Trona, averaging only 0.3 inches (7.6 mm), but there was 9.0 inches (230 mm) in January 1974.[6]


In the state legislature, Trona is located in the 18th Senate District, represented by Republican Roy Ashburn, and in the 32nd Assembly District, represented by Republican Jean Fuller.

In the United States House of Representatives, Trona is in California's 8th congressional district, represented by Republican Paul Cook.[7]

Views of Trona


  1. ^ "Trona, CA". Retrieved 2011-11-05. 
  2. ^ a b c David Kelly, Solitary, Splendid Squalor, Los Angeles Times, October 4, 2006, Accessed May 16, 2009.
  3. ^ Christensen, Joe (Nov 28, 1996). "Bucking the usual tradition Trona's all-sand field gets nod of approval from CIF". The Press - Enterprise (Riverside, Calif.). p. D.01. 
  4. ^ Verrier, Richard (16 October 2012). "'"Mojave Desert town Trona stars in indie horror film 'Lost Lake. Los Angeles Times. Retrieved 14 January 2013. 
  5. ^ "Searles Lake, San Bernardino Co., California, USA". Retrieved January 7, 2010. 
  6. ^ "TRONA, CALIFORNIA - Climate Summary". Retrieved 2011-11-05. 
  7. ^ "California's 8th Congressional District - Representatives & District Map". Civic Impulse, LLC. 

External links

  • Trona on the Web
  • The Searles Valley Historical Society
  • Trona California: portrait of a mining town (includes an aerial view)
  • Searles Lake, Trona, and the Pinnacles - slideshow
  • Searles Valley Timeline
  • Abandonment in Trona photoset

A dust storm forms over the dry Searles Lake bed, taken from the Trona tourist stop.
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