NABSQNO 13S-252970-4077035Burro Spring Bridge, San Juan County, New Mexico Photo by Larry Beck NABSQNO 13S-252970-4077035. Burro Spring Bridge is a waterfall natural bridge eroded through San Jose Formation sandstone. It is located about 13 miles east of Aztec, San Juan County, New Mexico. Access is via a complex of mineral exploration roads (dirt) stemming north from highway 173. The arch has a span of about 17 feet.
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