Rocks State Park is located near Pylesville, MD; but Hidden Valley is not in the main park. Hidden Valley has a small parking lot at the intersection of Madonna, Telegraph and Carea Roads. There are picnic tables under large shade trees in this area along the Creek. This section of Deer Creek offers good access, great scenery and nice trout. Trout are stocked in the spring and fall on this scenic creek that meanders through woodland. Look to the Maryland Freshwater Fishing guide for more information on regulations. A Maryland Non-Tidal Fishing License and a trout stamp are required for anyone 16 years of age or older. For insurance purposes, all non-members must register as a CWA member-for-a-day at this event- fee is $10.