The American Dam, or American Diversion Dam, is a diversion dam on the Rio Grande in El Paso, Texas, that divides the river water between Mexico and the U.S. It is about 140 feet north of the point where the west bank of the river enters Mexico, 3.5 miles from the business center. The dam is operated by the International Boundary and Water Commission. It sta…The American Dam, or American Diversion Dam, is a diversion dam on the Rio Grande in El Paso, Texas, that divides the river water between Mexico and the U.S. It is about 140 feet north of the point where the west bank of the river enters Mexico, 3.5 miles from the business center. The dam is operated by the International Boundary and Water Commission. It started operation in 1938.