Runners in this years half marathon will run along the Sacramento River and will be crossing three bridges: the Sundial Bridge, the Ribbon Bridge and the Diestelhorst Bridge. The runners will start out crossing the Turtle Bay Sundial Bridge, and go north on paved paths in park surroundings most of the way, until they reach the Ribbon Bridge where they cross the Sacramento River and go south until they reach Middle Creek trail, which is an out and back (2 miles), with a return to the River Trail…