Human-powered traffic flows along river trails Print Email RIGHT: Put Fido on a leash when using the network of trails along Tucson-area watercourses. For a short, brisk workout, run, walk or cycle a segment. Link paths together for longer, more rigorous excursions. July 09, 2011 12:00 am • ARIZONA DAILY STAR Comments Join Discussion Related Stories Human-powered traffic flows along river trails More Recreation stories Horses' hooves, erosion turn trails into trenches Sky Spy: Venus returns to the night sky Former wild-roaming horses, burros coming up for adoption Catalina Park, un respiro en la ciudad