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Zimmerman Trailhead to Three Bridges Professional Review and Guide
"This short loop begins in the desert and drops quickly into Davidson Canyon, which features the lush and protected riparian habitat of Cienega Creek Natural Preserve.
Three bridges jostle for space over Cienega Creek—two carry Union Pacific Railroad trains, and the third is for Marsh Station Road (called Frontage Road or Pantano Road on older maps). It’s an unusual synthesis of technology and nature that few people get to appreciate."
--Rob Rachowiecki, Five-Star Trails: Tucson (Menasha Ridge Press).
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