Santo Domingo River (Oaxaca)
Encyclopedia
The Santo Domingo River in Oaxaca state, Mexico
Mexico
The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

 is one of the main tributaries of the Papaloapan River
Papaloapan River
The Papaloapan River is one of the main rivers of the Mexican state of Veracruz. Its name is derived from the Nahuatl papalotl and apan ....

, rising in the Sierra Madre de Oaxaca
Sierra Madre de Oaxaca
The Sierra Madre de Oaxaca is a mountain range in southern Mexico. It begins at Pico de Orizaba and extends in a southeasterly direction for 300 km until reaching the Isthmus of Tehuantepec...

 and flowing east towards San Juan Bautista Tuxtepec
San Juan Bautista Tuxtepec
San Juan Bautista Tuxtepec , or simply referred to as Tuxtepec, is the head of the municipality by the same name and is the second most populous city of the Mexican state of Oaxaca....

, above which it joins with the Valle Nacional River
Valle Nacional River
The Valle Nacional River is a river of Oaxaca state in Mexico.The river originates in the Sierra Juárez, Oaxaca.The ecology of the region, originally one of pine forests, is threatened by logging, agriculture and grazing....

 to form the Papaloapan.
Carrying sediment from the mountains, it was a major cause of flooding in the coastal plain of Veracruz
Veracruz
Veracruz, formally Veracruz de Ignacio de la Llave officially Estado Libre y Soberano de Veracruz de Ignacio de la Llave , is one of the 31 states that, along with the Federal District, comprise the 32 federative entities of Mexico. It is divided in 212 municipalities and its capital city is...

 by reducing the capacity of the Papaloapan to drain the plains.
To alleviate these problems, the Cerro de Oro Dam
Cerro de Oro Dam
The Cerro de Oro Dam , also called the Miguel de la Madrid Hurtado Dam, is on the Santo Domingo River in the San Juan Bautista Tuxtepec municipality of the Papaloapan Region of Oaxaca state in southern Mexico....

 was constructed on the river just above the junction with the Valle Nacional, completed in 1989. The dam extended the reservoir formed by the Miguel Alemán Dam
Miguel Alemán Dam
The Miguel Alemán Dam is on the Tonto River in the Papaloapan Region of Oaxaca state in southern Mexico, just upstream from the town of Temascal or Nuevo Soyaltepec, forming the Miguel Alemán Lake with an area of 47,800 hectares....

, located on the Tonto River.
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