Lime Ridge Open Space Trail Run Entrance
From downtown Walnut Creek, drive out Treat Blvd. to the Oak Grove Road intersection. Continue over the top of the hill another 1.5 miles and make a U-turn at Thompson Drive. Turn immediately right into the Open Space parking lot just past Lime Ridge Trail Run.
From downtown Concord, drive out east on Clayton Blvd. to the Treat Blvd. intersection. Turn Right on Treat Blvd. Continue over down Treat Blvd. for another 1.5 miles, then turn immediately right into the Open Space parking lot just past Lime Ridge Trail Run.
After parking, walk northeast on Lime Ridge Trail run toward the building– this is the Lindsay Biological Field Station.