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    San Juan River (Colorado River tributary) - Wikipedia

    • The San Juan River is a major tributary of the Colorado River in the Southwestern United States, providing the chief drainage for the Four Corners region of Colorado, New Mexico, Utah, and Arizona. Originating as snowmelt in the San Juan Mountains (part of the Rocky Mountains) of Colorado, it flows 383 miles (616 km) through the deserts of northern New M… 展开

    Course

    The San Juan River begins in Archuleta County, Colorado at the confluence of its East and West Forks. Both forks originate above elevations of 10,000 feet (3,000 m) in the eastern San Juan Mountains in the San Juan Nation… 展开

    Geology

    The oldest geologic feature of the San Juan River basin is the San Juan Mountains, which consist largely of Precambrian and Paleozoic crystalline rock and outcrops of Tertiary volcanic rock. During the Paleocene and … 展开