Whiskey’s for drinking and water’s for fighting about. Mark Twain Figure 1. Location of Rio Grande River and Rio Grande drainage basin. The Rio Grande River and Rio Grande Basin The Rio Grande River heads up in the eastern San Juan Mountains of southern Colorado and flows nearly 2000 miles to the Gulf of Mexico. It is the second longest river in the U.S. and for 2/3 of its length it forms the boundary between the U.S. and Mexico(from El Paso, Texas/Ciudad Juarez, Mexico to the Gulf of Mexico at Brownsville, Texas). Since its waters are utilized by three states and Mexico, the Rio Grande is considered an interstate and Read More …