Images and photos of Mt Tabor Park, Portland, Oregon. Environmental Protection Agency (EPA) regulation: Long Term 2 Enhanced Surface Water Treatment Rule, referred to as the LT2 Rule imposes new requirements that open water reservoirs be covered, buried or additionally treated. This applies to Portland's five open reservoirs and to the unfiltered Bull Run source supplying them. The 3 open reservoirs in Mount Tabor Park, with their ancillary structures, were placed in the National Register of Historic Places on January 15, 2004. Active citizen interest is shown by Friends of Mount Tabor Park (http://www.taborfriends.com/) and Friends of the Reservoirs (http://friendsofreservoirs.org/index.html).