2,617 articles
Covered bridges of Ashtabula County, Ohio
The covered bridges of Ashtabula County, Ohio, are a cluster of 19 bridges, from an 18-foot span to the 613-foot Smolen–Gulf Bridge, the longest in the United States.
Covered bridges of Lancaster County, Pennsylvania
The covered bridges of Lancaster County, Pennsylvania, are roughly 28 surviving wooden, roofed truss bridges, mostly Burr arch trusses painted red; ten remain open to traffic under county ownership.
Covered bridges of Madison County, Iowa
The covered bridges of Madison County, Iowa, are six surviving wooden covered bridges, five originals built between 1868 and 1884 and one 2004 replica, in a county that once had nineteen.
Covered bridges of Parke County, Indiana
The covered bridges of Parke County, Indiana, are 31 surviving timber truss spans built from 1847 to 1920, nearly all on the National Register of Historic Places.
Covered bridges of the South, Appalachia and West
Covered bridges of the South, Appalachia and West surveys surviving timber-roofed bridges outside the East, including 17 in West Virginia, 6 in Tennessee, and 49 in Oregon.
Crane Bridge
Crane Bridge is a Grade I listed 15th-century stone bridge on Crane Street carrying the road across the River Avon in Salisbury, Wiltshire, with four splayed arches, four cut-waters, and an 1898 widening; list entry 1240793.
Crescent City Connection
The Crescent City Connection, formerly the Greater New Orleans Bridge, is a pair of twin cantilever bridges carrying US 90 Business across the Mississippi River at New Orleans.
Crimean Bridge (Крымский мост)
The Crimean Bridge, also called the Kerch Bridge (Крымский мост), is a 19 km road-and-rail crossing of the Kerch Strait between Russia and Kerch in Crimea, opened in 2018.
Critical state soil mechanics
Critical state soil mechanics, developed by Roscoe, Schofield, and Wroth at Cambridge in 1958, describes soil strength and deformation through stress state and void ratio.
Crofton Pumping Station
Crofton Pumping Station, also known as Crofton Beam Engines, is a canal pumping station in Wiltshire, England, built in 1809 for the Kennet and Avon Canal.
Cross City Tunnel
The Cross City Tunnel, also known as the Sydney Cross City Tunnel, is a pair of toll road tunnels under the Sydney central business district, opened in 2005.
Cross passage
A cross passage is a short tunnel connecting two parallel tunnel tubes so people can escape from a tube affected by fire into the adjacent one.
Cross-Harbour Tunnel
The Cross-Harbour Tunnel is a 1.9 km road tunnel under Victoria Harbour, Hong Kong, linking Hung Hom and Causeway Bay; opened in 1972 as the harbor's first road crossing.
Crossrail
Crossrail is a railway program in London that built a new east–west line from Reading and Heathrow to Shenfield and Abbey Wood, opened in 2022 as the Elizabeth line.
Croton Aqueduct
The Croton Aqueduct was New York City's first major water-supply works, a 41-mile gravity-fed masonry conduit carrying water from the Croton River in Westchester to Manhattan reservoirs from 1842.
CSA A23.3
CSA A23.3, titled Design of Concrete Structures, is the Canadian national standard for the structural design of reinforced and prestressed concrete buildings, referenced by the National Building Code of Canada.
CSA S16
CSA S16 is the Canadian national standard for designing, fabricating, and erecting steel structures, published by CSA Group; its current edition, S16:24, dates from 2024.
Culebra Cut
Culebra Cut is the artificial valley carrying the Panama Canal 8.75 miles through the Continental Divide, from Gamboa to Pedro Miguel, and the canal's narrowest, hardest-won section.
Culvert
A culvert is a pipe or enclosed conduit that carries a stream under a road, railway, or embankment; US practice treats spans of 20 feet or less as culverts.
Cut and cover
Cut and cover is a tunnel construction method in which a trench is excavated from the surface, the tunnel is built inside it, and the trench is backfilled.
Cut-and-cover tunneling
Cut-and-cover tunneling is a construction method that builds a tunnel in a trench excavated from the surface, then backfills it, economical at shallow depths of about 10 to 12 meters.
Cutter suction dredger
A cutter suction dredger (CSD) is a stationary dredging vessel that loosens the seabed with a rotating cutter head, pumping the material through a pipeline for reclamation, ports, and waterways.
Cutterhead (tunnel boring machine)
A cutterhead is the rotating front part of a tunnel boring machine that carries cutting tools against the tunnel face to break rock and soil.
Cycle tunnel
A cycle tunnel is a tunnel designed primarily for bicycle traffic, ranging from Rotterdam's Maastunnel of 1937–1942 to new Dutch openings in 2025 and 2026.
Daecheong Dam
Daecheong Dam (대청댐) is a multipurpose dam on the Geum River in South Korea, built between 1975 and 1980 and operated by the Korea Water Resources Corporation.
Daegu subway fire
The Daegu subway fire (대구지하철 화재참사) was a February 2003 arson attack at Jungangno Station on Daegu's metro in South Korea, killing 192 people and injuring 151.
Dam
A dam is an engineered barrier to water flow that creates a reservoir used for irrigation, power generation, water supply, flood control, navigation, or recreation.
Dam breach and dam-break analysis
Dam-break analysis is the modeling of a hypothetical dam failure to predict breach size, peak discharge, and downstream flooding, supporting hazard classification and emergency action plans.
Dam break analysis
Dam break analysis is the engineering practice of predicting what happens when a dam fails, estimating breach size and outflow, and routing the flood downstream to produce inundation maps.
Dam decommissioning
Dam decommissioning is the planned withdrawal of a dam from service, ranging from partial modification to full removal, when a structure is unsafe, obsolete, or environmentally harmful.