Blanca Peak (Navajo: ) is the fourth highest summit of the Rocky Mountains of North America and the U.S. state of Colorado. The ultra-prominent peak is the highest summit of the Sierra Blanca Massif, the Sangre de Cristo Range, and the Sangre de Cristo Mountains. The fourteener is located north by east (bearing 9°) of the Town of Blanca, on the drainage divide separating Rio Grande National Forest and Alamosa County from the Sangre de Cristo Land Grant and Costilla County. The summit is the highest point of both counties and the entire drainage basin of the Rio Grande. Below the steep North Face of Blanca Peak two live Glaciers once developed, until extinction sometime after 1903. North & South Blanca Glaciers were located at 37° 35N.,longitude 105° 28W. Blanca Peak is higher than any point in the United States east of its longitude. The Blanca Peak Tripoint of Alamosa, Costilla, and Huerfano counties is located on the same drainage divide approximately northeast by north (bearing 30°) of the Blanca Peak summit at the boundary of the San Isabel National Forest. The Blanca Peak Tripoint is the highest point in Huerfano County. Geography Blanca Peak is located at the southern end of the Sangre de Cristo Range, a subrange of the more extensive Sangre de Cristo Mountains, and is the highest peak in both ranges. It lies approximately east-northeast of the town of Alamosa. Approximately to the north-northwest is Great Sand Dunes National Park and Preserve. Blanca Peak is notable not only for its absolute height, but also for its great local relief and dominant position at the end of the range, rising high above the San Luis Valley to the west. For example, it rises nearly over the edge of the San Luis Valley in only . Blanca is also the third most topographically prominent peak in Colorado; it is separated from the higher peaks in the Sawatch Range by relatively low Poncha Pass at . Blanca Peak heads up three major creeks. Holbrook Creek is on the west, flowing from a basin including Crater Lake, Blue Lakes, and Como Lake. An extremely challenging four wheel drive road accesses Como Lake , and provides the most common access to Blanca Peak. Most vehicles stop at an elevation of between and on this road. The Como Lake Road is a designated Alamosa County Road and runs to the edge of