Piedras Negras (Spanish pronunciation: [ˈpjeðɾas ˈneɣɾas] ) is a city and seat of the surrounding municipality of the same name in the Mexican state of Coahuila. It stands at the northeastern edge of Coahuila on the Mexico–United States border, across the Rio Grande from Eagle Pass in the U.S. state of Texas. In the 2015 census the city had a population of 163,595 inhabitants,[1] while the metropolitan area had a population of 245,155 inhabitants.[1] The Piedras Negras and the Eagle Pass areas are connected by the Eagle Pass–Piedras Negras International Bridge, Camino Real International Bridge, and the Union Pacific International Railroad Bridge.
In Spanish, Piedras Negras translates to 'black stones' – a reference to coal deposits in the area. Across the river, coal was formerly mined on the U.S. side at Dolchburg, near Eagle Pass. This mine closed around 1905, after a fire. Mexico currently operates two large coal-fired power stations named "José López Portillo" and "Carbón 2" located 30 miles (48 km) south of Piedras Negras. These two coal-fired power plants are currently operated by Comisión Federal de Electricidad, the state-owned Mexican electric utility.
On June 15, 1850, a group of 34 men (commanded by Andrés Zapata, Gaspar Salazar and Antonio Ramírez) met with Colonel Juan Manuel Maldonado to give the news that they had created a pass point at Piedras Negras, to the right of the Rio Grande, south of Fort Duncan. They named it Nueva Villa de Herrera, but it later became Villa de Piedras Negras. In Otto Schober's "Breve historia de Piedras Negras," the local historian points out that the 34 men were repatriates (Mexican Americans) who arrived on June 15, 1850, in what was then called "Colonia Militar de Guerrero en Piedras Negras."[2]
In 1855, the town was looted by a small force of 130 Texans that had been organized by Texas slaveholders for a punitive expedition against a nearby border settlement the Texans claimed contained fugitive slaves and Native Americans. The force was led by a captain of the Texas Rangers. As it happened, the incursion was opposed and "repelled by a superior force of Negroes, Native Americans, and Mexicans who were waiting in ambush" inside Mexico. But the Ranger-led expedition then looted Piedras Negras while returning to Texas.[3]
Following the discovery of huge deposits of coal in the region, in 1881 a railroad track was begun that was completed in 1883. The regional economy flourished and on December 1, 1888, it was granted city status; this time with the name of Ciudad Porfirio Díaz. After the fall of Diaz in 1911, the city reverted to being Piedras Negras, Coahuila.[citation needed]
On April 26, 2004, flooding killed 31 people with up to 60 reported missing.[citation needed]
On April 24, 2007, an F4 tornado struck the city, killing three people there and seven in Eagle Pass, Texas.[4]
From June 14–15, 2013 over 10,000 homes were damaged by flooding and one person was killed.[citation needed]
On the night of June 8, 2018, former Piedras Negras mayor Fernando Purón was shot in the back of the head by an unknown man while Purón was taking a selfie with an admirer. Purón died on the spot, becoming the 112th candidate or politician to be killed since Mexico's electoral campaign began in September 2017. Purón was supposed to run in the 2018 Mexican election on July 1 as a congressional candidate of the Institutional Revolutionary Party (PRI). Sonia Villarreal, current mayor of Piedras Negras and fellow member of PRI, suspended her mayoral reelection campaign in response to Purón's murder to concentrate on her current duties, stating that "We don't (want) his name to be just one more added to the list of candidates who have been victims of these deplorable acts."[5]
The Northern Region of Coahuila has approximately 300,000 inhabitants. According to the National Institute of Statistics, Geography and Data Processing (INEGI), in 2005 the population of the municipio of Piedras Negras was 143,915 inhabitants, equal to 5.77% of the population of Coahuila. 17% of the population of Piedras Negras came from other states, 3% were foreigners, and the rest were born in Coahuila. Piedras Negras has a high population growth due partly to its status as a border city fueled by U.S.-bound exports from several factories and also by persons who hope to cross the border into the United States. It is estimated that in a couple of years it will become the third most populated city of the state of Coahuila, surpassing Monclova. Nowadays Piedras Negras has more than 200,000 inhabitants.
Piedras Negras has a hot semi-arid climate, having some influences of the dry-winter humid subtropical climate (Cwa). During summer the temperatures often surpass 45 °C (113 °F). The hottest months are May through September with a daily average (mean) temperature between 26 °C (79 °F) and 31 °C (88 °F).
The high temperatures recorded in Piedras Negras have earned it recognition as one of the hottest cities in the country.[6]
Highest precipitation months are May, June and September with an average monthly downfall in excess of 80 millimetres (3.1 in) but that is highly sporadic lending to frequent drought conditions. The period of lowest precipitation is between December through March, with a monthly average of 30 millimetres (1.2 in).