Adjoining the Lake Berryessa Recreational Area is the recently designated Cedar Roughs Wilderness. The Northern California Coastal Wild Heritage Wilderness Act of 2006 set aside the former study area of 6,350 acres located 1.8 miles past Pope Creek bridge on the Pope Creek arm of Lake Berryessa. The wilderness can be accessed by car or boat, although there are no maintained trails (as yet). Hiking can be difficult as more than half of the wilderness consists of Sargent cypress, which covers 3,000 acres and is relatively pure genetically. It is the second most widely distributed cypress in California, and was named for Charles Sprague Sargent (1841-1927), the founder and director of Harvard University's Arnold Arboretum and author of the 14-volume Silva of North America. The area is jointly managed by the Bureau of Land Management and California Department of Fish and Game.