H.R. 4818 Consolidated Appropriations Act, 2005 - Title VIII--Federal Lands Recreation Enhancement Act (FLREA), a. k.a. Recreation Enhancement Act (REA).
FLREA established the current recreation fee authority for the National Park Service, U.S. Fish and Wildlife Service, and the national Bureau of Land Management, Bureau of Reclamation and Forest Service. Click here to view the FLREA portion of the legislation
http://www.forestcamping.com/forum_docs/viii-fed_lands_rec_enhance_act.pdf - the pages are numbered for ease of reference.
To get right to the meat of the issues, go to page 6 for definitions. Then, starting with SEC. 803. RECREATION FEE AUTHORITY on page 8, that's where (from there on) the rubber doesn't always hit the pavement.