The San Luis Valley is a region in south - central Colorado with a small portion overlapping into New Mexico. It is the headwaters of the Rio Grande. It contains 6 counties and portions of 3 others. The valley was ceded to the United States by Mexico following the Mexican -- American War. Hispanic settlers began moving north and settling in the valley after the United States made a treaty with the Utes and established a fort. Prior to the Mexican war the Spanish and Mexican governments had reserved the valley to the Utes, their allies. During the 19th century Anglo settlers settled in the valley and engaged in mining and irrigated agriculture. Today the valley has a diverse Anglo and Hispanic population.
where is the san luis valley in colorado
south - central Colorado with a small portion overlapping into New Mexico