This is a mixed Trail Run. The 5K is on a paved course (the Old San Pablo Dam Road), while the 5Miler and 1/2 Marathon veer off onto dirt trail with rolling small hills. The 1/2 Marathon is the only opportunity in the Bay Area to run 2 Reservoirs, San Pablo Dam and Briones ! All courses maintain a fabulous view of the Reservoir and the surrounding landscape, picturesque and beautiful. Be sure to enjoy the views while you battle for your finishing place !!!