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Encyclopedia > Boundary Treaty of 1970

The 1970 Boundary Treaty between the United States and Mexico settled all then pending boundary disputes and uncertainties related to the Rio Grande (Río Bravo del Norte) border. The most significant dispute remaining after the Chamizal Settlement in 1963 involved the location of the boundary in the area of Presidio, Texas, and Ojinaga, Chihuahua. The river channel was jointly relocated to approximate conditions existing prior to the dispute which arose from changes in the course of the river in 1907. The IBWC was charged with its implementation. The American-Mexican Treaty Act of October 25, 1972 authorized the United States Section's participation. The project was undertaken in 1975 and completed in 1977. The Rio Grande flowing in Big Bend National Park Known as the Rio Grande in the United States and as the Río Bravo (or, more formally, the Río Bravo del Norte) in Mexico, the river, 3034 km long, rises in the San Juan Mountains of Colorado, USA, flows... The Chamizal dispute was a border conflict over about 600 acres on the U.S.-Mexico border between El Paso, Texas, and Ciudad Juárez, Chihuahua. ... 1963 (MCMLXIII) was a common year starting on Tuesday (link will take you to calendar). ... Presidio is a city located in Presidio County, Texas. ... Ojinaga is a rural town in northern region of the Mexican state of Chihuahua. ... The Murray River in Australia. ... 1907 (MCMVII) was a common year starting on Tuesday (see link for calendar). ... The International Boundary and Water Commission (Spanish: Comisión Internacional de Límites y Aguas) is an international body created in 1889 by the United States and Mexico to administer the many boundary and water-rights treaties and agreements between the two nations. ... October 25 is the 298th day of the year (299th in leap years) in the Gregorian Calendar, with 67 days remaining. ... 1972 (MCMLXXII) was a leap year that started on a Saturday. ... 1975 (MCMLXXV) was a common year starting on Wednesday (the link is to a full 1975 calendar). ... For the album by Ash, see 1977 (album). ...


The river was relocated in two reaches by construction of a new channel 4.7 miles (8 km) in length in one reach and 3.6 miles (6 km) in the other. The relocated channel was aligned in the reach above Presidio-Ojinaga so as to transfer from north to the south side of the river 1606.19 acres and in the second reach downstream from the two cities so as to transfer from the south to the north side 252 acres. It is an earth channel with dimensions patterned after the natural channel. The United States acquired 1,969.22 acres of agricultural land for transfer of lands to Mexico and for half of the river relocation. A mile is a unit of distance (or, in physics terminology, length) currently defined as 5,280 feet, 1,760 yards, or 63,360 inches. ... A kilometre (American spelling: kilometer) (symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). ... An acre is an English unit of area. ...


Also, the channel of the Rio Grande in the Hidalgo–Reynosa area was relocated to transfer from Mexico to the United States 481.68 acres by constructing a new earth channel 1.6 miles (3 km) in length. This transfer was made in exchange for the transfer from the United States to Mexico of two tracts of land, the Horcon Tract and Beaver Island (Isla Morteritos), located south of the Rio Grande, comprising 481.68 acres. Hidalgo is a city located in Hidalgo County, Texas. ... Reynosa is a primarily industrial city in the Mexican state of Tamaulipas. ...


The total costs of these two relocations were equally shared by the two governments, with the United States performing the greater part of the work required in the Presidio-Ojinaga area, and Mexico performing the work required in the Hidalgo-Reynosa area and a small part of the work required in the Presidio-Ojinaga area.


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