Get ready for the 18th annual Diamond Valley Lake Marathon benefiting the Hemet San Jacinto Habitat for Humanity. Run in the valley of the Mastodons along a scenic route around the lake. The trail is a maintained dirt road with minor elevation changes. The dam on the East side is a flat asphalt road and the West side is flat the majority of the way with a steep uphill grade at the end of the run. This will be one of the most beautiful runs that you will experience in Southern California.