In addition to the reservoir at Powell Butte, as of 2009 the city of Portland has five large open drinking water reservoirs and an underground reservoir in two city parks at lower elevations, and is working on a second reservoir at Powell Butte. Reservoirs 1, 5, and 6, which are open, and Reservoir 7, which is underground, are in Mount Tabor Park in southeast Portland, and Reservoirs 3 and 4 are in Washington Park in southwest Portland. Reservoir 2 at Mount Tabor was abandoned in 1976. Work began in September 2009 on a second 50 million-gallon (190,000 m3) underground reservoir to be completed by 2013 at Powell Butte. Its storage capacity is meant to offset the loss of the five open reservoirs at Mount Tabor and Washington parks, which will be disconnected from the water system by 2015. The three functioning Mount Tabor reservoirs, including gatehouses, wrought-iron fences, and ornate lampposts, in Mount Tabor Park, are listed on the National Register of Historic Places. The Washington Park reservoirs and their gatehouses and fences are also listed on the National Register.