2020 Map of Thompson Mesa

About this map

Blanco Canyon and its associated Blanco Wash define the primary drainage system of this high-desert landscape in the Eastern Navajo Agency. This part of the San Juan Basin is characterized by sharp elevation changes between the canyon floors and the expansive plateau of Thompson Mesa, which rises in the eastern portion of the quadrangle. The land is sparsely developed, with the terrain marked by geological landmarks such as Blanco Mesa and the prominent Dufers Point. The map details the transition between San Juan and Rio Arriba counties, where the county line runs north-south across the high ground. Human impact is visible through a network of secondary routes including Co Rd 7425 and Co Rd 7575, which provide access through the complex network of side drainages like Selph Canyon.