5,208 articles
Ringedals Dam
Ringedals Dam (Ringedalsdammen) is a concrete gravity dam at the head of Ringedalsvatnet in Skjeggedal, above Tyssedal in Vestland, Norway. Built 1910–1918 for the Tysso I hydroelectric plant, it was Norway's largest dam when completed.
Rio Grande diversion canals
The Rio Grande diversion canals are irrigation canals in New Mexico and west Texas, belonging to the Middle Rio Grande Conservancy District and the federal Rio Grande Project.
Rio Grande Project
The Rio Grande Project, also called the Rio Grande Reclamation Project, is a US Bureau of Reclamation irrigation and power project on the Rio Grande in New Mexico and west Texas.
Rio–Antirrio Bridge
The Rio–Antirrio Bridge (Γέφυρα Ρίου-Αντιρρίου), officially the Charilaos Trikoupis Bridge, is a cable-stayed road bridge in Greece linking Rio on the Peloponnese with Antirrio, inaugurated in 2004.
Rio–Antirrio Bridge (Γέφυρα Ρίου-Αντιρρίου)
The Rio–Antirrio Bridge (Γέφυρα Ρίου-Αντιρρίου), officially the Charilaos Trikoupis Bridge, is a cable-stayed bridge near Patras, Greece, opened in 2004 to link the Peloponnese with the mainland.
Rio–Niterói Bridge
The Rio–Niterói Bridge (Ponte Rio–Niterói) is a box girder bridge crossing Guanabara Bay, connecting Rio de Janeiro and Niterói. Inaugurated in 1974, it carries the BR-101 highway.
Riprap
Riprap, also called shot rock or rock armor, is a layer of large loose stone or concrete blocks placed to protect soil from erosion by water.
Riqueval Tunnel
The Riqueval Tunnel (souterrain de Riqueval), also called the Grand Souterrain, is a 5,670-meter navigable canal tunnel on the Canal de Saint-Quentin in northern France, opened in 1810.
Rise Tower
Rise Tower names several buildings: I Rise Tower, a 158 m Dubai office tower completed 2011; a proposed 2,008 m megatall in Riyadh's North Pole district; and Torre Rise, a 484 m skyscraper under construction in Monterrey, set to be Latin America's tallest.
Riser (stairs)
A riser is the vertical face between one stair tread and the tread above; its height is regulated for safety, with open risers prohibited under the ADA.
Rivers and Harbors Act
The Rivers and Harbors Act names a series of United States federal statutes, beginning in 1824, that fund navigable water improvements, with the 1899 act still governing obstructions and refuse in navigable waters.
Riverside Church (New York City)
The Riverside Church in the City of New York is an interdenominational church in Morningside Heights, Manhattan, built 1927–1930 with funding from John D. Rockefeller, Jr.
Riviera Tower
Riviera Tower is a 200-meter, 50-storey residential skyscraper under construction at The Ellinikon on the Athens waterfront, set to become the tallest building in Greece.
Robert F. Mast
Robert F. Mast was an American structural engineer who spent fifty years at BERGER/ABAM Engineers in Washington, led precast concrete design, and died in 2020.
Robert S. O'Neil
Robert S. O'Neil (1935–2021) was an American civil engineer who served as Chief Engineer on the Washington Metrorail and was elected to the National Academy of Engineering.
Robert Stephenson
Robert Stephenson (1803–1859) was an English railway and civil engineer, George Stephenson's only son, chief engineer of the London and Birmingham Railway and inventor of the wrought-iron tubular bridge.
Robert Taylor Homes
Robert Taylor Homes was a Chicago public housing project of 28 high-rises along State Street, opened in 1962 as the nation's largest and demolished by 2007.
Robert Venturi
Robert Venturi (1925–2018) was an American architect and writer whose critique of modernism helped open the way to postmodern architecture, winning the Pritzker Prize in 1991.
Robie House
The Robie House, formally the Frederick C. Robie House, is a Frank Lloyd Wright house museum in Chicago's Hyde Park, widely regarded as the fullest expression of his Prairie style.
Robin Hood Gardens
Robin Hood Gardens was a Brutalist council housing estate in Poplar, East London, designed by Alison and Peter Smithson, completed in 1972, and demolished from 2017.
Rochdale Canal
The Rochdale Canal is a 33-mile broad canal in northern England crossing the Pennines from Manchester to Sowerby Bridge; opened in 1804, it closed in 1937 and reopened in 2002.
Rock bolt
A rock bolt, also called a roof bolt, is a steel or composite rod anchored in drilled rock with a plate to reinforce tunnels, mines, slopes, and dams.
Rock mass classification
Rock mass classification is a family of geotechnical methods, including RMR, Q, and GSI, that rate rock strength, discontinuities, and groundwater to estimate rock quality and tunnel support requirements.
Rock mass rating
The rock mass rating (RMR) system, also called the Geomechanics Classification, rates a rock mass from 0 to 100 using six parameters, guiding tunnel support, mining, slope, and foundation design.
Rock-fill dam
A rock-fill dam is an embankment dam built mainly of quarried rock, made watertight by an earth core, concrete face, or asphaltic membrane, and favored for seismic sites.
Rockefeller Center
Rockefeller Center is a large Art Deco complex of office towers, studios, and public spaces in Midtown Manhattan, New York City, built between 1932 and 1939.
Rockwood Hall
Rockwood Hall was William Rockefeller's Gilded Age estate in Mount Pleasant, New York, with a 204-room mansion, the second largest private home in the US after Biltmore, landscaped by Olmsted, demolished 1941-42, now an 88-acre section of Rockefeller State Park Preserve.
Rococo interiors
Rococo interiors are the eighteenth-century room ensembles of Louis XV's France, where panelling, mirrors, furniture, and painting form one light-colored, asymmetric, curvilinear whole, exemplified by the hôtel de Soubise.
Roddy Llewellyn
Roddy Llewellyn, born Roderic Victor Llewellyn in Wales in 1947, is a British garden designer, journalist, and author who became widely known through his eight-year relationship with Princess Margaret.
Roe Messner
Roe Messner (Ronald Roe Messner, 1935–2025) was an American contractor from Wichita, Kansas, who built more than 1,700 churches and was chief contractor for Heritage USA.