Lime Ridge is located on the eastern edge of Walnut Creek on a dominant ridge leading to Mount Diablo. It contains some of the last remaining chaparral in Walnut Creek and a rich diversity of plant and animal life. Lime Ridge gets its name from the limestone in the area that was quarried by the Cowell Portland Cement Company. There are many hiking, biking, and wildlife viewing opportunities through multiple plant communities and quarries. Portions of Lime Ridge are within the City of Concord and managed by The city of Walnut Creek.