thickness of the arch rings is . The thickness at the present top of the dam is . The arch rings are 120 degree arcs of circles. The spacing between buttress centers is . The two sets of outlet gates each consist of two pipes with a suitable grating entrance, and with a butterfly and a double-disc gate valve on each pipe. The total quantity of concrete in the dam is 8,271 cubic yards (6,323 m³). The total cost of the dam was $90,000. The storage capacity at the present height is slightly over . The general design and supervision was handled under the direction of Sylvester Q. Cannon, City Engineer of Salt Lake City and John S. Eastwood acting as consulting engineer. Parrott Bros. Co. were the contractors. Condition As of 2019 Mountain Dell Dam was listed as being in "poor" condition, with increased hazard due to its proximity to highways and parks, with risk to life in the event of failure. A liner is being installed on the upstream face to control water intrusion that creates freeze/thaw damage. Until the deterioration is arrested, the reservoir may only be half full during the winter. See also American Water Landmark – (awarded 1981) References External links Industrial buildings and structures on the National Register of Historic Places in Utah Buttress dams Arch dams Dams on the National Register of Historic Places in Utah Buildings and structures in Salt Lake County, Utah Dams completed in 1925 United States local public utility dams Historic American Engineering Record in Utah Wasatch Range National Register of Historic Places in Salt Lake County, Utah