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26-646: The Arrábida Bridge is an arch bridge of reinforced concrete which carries six lanes of traffic over the Douro River , between Porto and Vila Nova de Gaia , in the Norte region of Portugal . In March 1952, a preliminary project for a roadway bridge was adjudicated to Professor Edgar António Mesquita Cardoso , by the JAE. It was approved in 1955. The construction of the bridge proceeded in May 1957. By decree 42/234, dated 22 April 1959,

52-479: A prosperous tourist industry has developed based on river excursions from Porto to points along the Upper Douro valley. The Douro railway line ( Linha do Douro ) was completed in 1887; it connects Porto, Rio Tinto, Ermesinde, Valongo, Paredes, Penafiel, Livração, Marco de Canaveses, Régua, Tua and Pocinho. Pocinho is near the very small city of Foz Côa, which is close to Côa Valley Paleolithic Art site. This

78-509: A tourist experience that allowed pedestrians to walk across the archway, an idea of Pedro Pardinhas, who invested 50,000 euros and safety equipment and transformation of a small annex as the reception hall for "Porto Bridge Climb". The bridge is isolated over the Douro river, supported over the northern margin along the Arrábida escarpment and along the southern margin at ravine in the area of Candal. It

104-552: Is a left tributary of the Main and is 132 km (82 mi) in length. The name derives from the Celtic word for water (compare: Dover ). It flows through Rothenburg ob der Tauber , Creglingen , Weikersheim , Bad Mergentheim , Königshofen , Tauberbischofsheim , and flows into the river Main in Wertheim am Main . The Tauber Valley Cycleway is a bicycle path which runs about 101 km along

130-797: Is cognate with modern Breton dour and Cornish dur "water" and results from a later typical Brittonic evolution of *dubro- , unknown in the Continental Celtic languages . The possible origin is the hydronymic root *dur- , which is Pre-Indo-European or Pre-Celtic . Albert Dauzat linked this river name to a Pre-Celtic hydronymic root *dor- , which is well attested in Western Europe : in France Doire , Doron , Douron, etc. and in Italy Dora , etc. The meaning of this element is, however, unknown. A folk-etymological derivation suggests that

156-510: Is considered important to the archaeological pre-historic patrimony, and it has been designated as a UNESCO World Heritage Site . Fifteen dams have been built on the Douro to regulate the water flow, generate hydroelectric power , and allow navigation through locks . Beginning at the headwaters, the first five dams are in Spain: Cuerda del Pozo , Los Rábanos , San José , Villalcampo and Castro Dams . The next five downstream are along

182-561: Is implanted downstream from the D. Luís Bridge , and is the closest to the mouth of the Douro River, establishing a connection between the IC1 (in Vila Nova de Gaia) and Porto beltway (VCI). The structure is an iron, archway bridge, constructed of reinforced concrete, asphalt deck. The deck is supported by a dual archway, united by corner narrow elements in concrete crosses. There are 76 pillars, with

208-717: The Aldeadávila Dam impounds the river, there are protected areas: the International Douro Natural Park (on the Portuguese side) and the Arribes del Duero Natural Park (on the Zamoran margin). The Douro fully enters Portuguese territory just after the confluence with the Águeda River ; once the Douro enters Portugal, major population centres are less frequent along the river. Except for Porto and Vila Nova de Gaia at

234-555: The Douro Valley in Portugal, long devoted to vineyards , has been designated by UNESCO as a World Heritage Site . The wine was taken downriver in flat-bottom boats called rabelos , to be stored in barrels in cellars in Vila Nova de Gaia , just across the river from Porto . Nowadays port is transported there in tanker trucks. In the 1960s and 1970s, dams with locks were built along

260-491: The European route E01 system) and two narrower lines for pedestrian passage. The total length of the deck is 493.2 metres (1,618 ft) with a width of 26.5 metres (87 ft) The arch has a rise of 52 metres (171 ft), and the maximum clearance above river level is 70 metres (230 ft) above the Douro. The cost of construction was 126 million escudos . Douro River The scenic Douro railway line runs close to

286-461: The Ministério das Obras Públicas ( Public Works Ministry ) promoted, through their respective City Councils, the construction of modest dwellings for the accommodation of families who needed to be demolished, as a result of the construction of access to the bridge. By 22 June 1963, the bridge was concluded and inaugurated. At the time of its completion, the bridge's main span of 270 metres (890 ft)

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312-483: The Ribera del Duero wine region. Sheep rearing is also still important. The drainage basin borders those of Miño to the north, Ebro to the east, and Tajo to the south. For 112 kilometres (70 mi), the river forms part of the border between Spain and Portugal , in a region of narrow canyons . It formed a historical barrier to invasions, creating a cultural/linguistic divide. In these isolated areas, in which

338-512: The - b -, of which there remains no trace, would not have disappeared, as evidenced by place-names derived from Gaulish *dubron (plural dubra ), such as French Douvres and English Dover (3rd/4th-century Dubris ; Douvres in French), Spanish Dobra, German Tauber ( Dubra-gave 807), and Gaelic/ Old Irish dobur "water" and river name Dobhar in Ireland and Scotland. Modern Welsh dŵr "water"

364-650: The Douro River are Valladolid and Zamora in Spain, and Porto and Vila Nova de Gaia in Portugal. The latter two are located at the mouth of the Douro at the Atlantic Ocean. In Portugal, the Douro flows through the districts of Bragança , Guarda , Viseu , Vila Real , Aveiro and Porto . Porto is the main hub city in northern Portugal. Its historic centre has been designated as a UNESCO World Heritage Site because of its significant architecture and history. These reaches of

390-431: The Douro have a mesoclimate allowing for cultivation of olives , almonds , and especially grapes , which are important for making port . The region around Pinhão and São João da Pesqueira is considered to be the centre of port, with its quintas (or farms/estates) that extend along the steep slopes of the river valleys. In the 21st century, many of these are owned by multinational, reputed wine companies. Recently,

416-541: The Iberian Peninsula after the Tagus and Ebro . Its total length is 897 kilometres (557 mi), of which only sections of the Portuguese section, being below a fall/rapids line, are naturally navigable, by modest rivercraft. The Douro River basin encompasses an area of approximately 97,290 square kilometres. In its Spanish section, the Douro crosses the great Castilian meseta and meanders through five provinces of

442-516: The Portuguese-Spanish border; the first three are owned and operated by Portugal: ( Miranda , Picote and Bemposta Dams ), while the next two belong to Spain: ( Aldeadávila and Saucelle Dams ). The Douro's last five dams are in Portugal, and allow for navigation: Pocinho , Valeira , Régua , Carrapatelo , and Crestuma–Lever dams. Vessels with a maximum length of 83 metres (272 ft) and width of 11.4 metres (37 ft) can pass through

468-579: The autonomous community of Castile and León : Soria , Burgos , Valladolid , Zamora , and Salamanca , passing through the towns of Soria , Almazán , Aranda de Duero , Tordesillas , and Zamora . The most important tributaries in this region are the Pisuerga , passing through Valladolid , and the Esla , which passes through Zamora . This region is generally semi-arid plains, with wheat and in some places, especially near Aranda de Duero , with vineyards , in

494-483: The five locks . The highest lock, at Carrapatelo Dam, has a maximum lift of 35 metres (115 ft). The waters of Pocinho lake reach 125 metres (410 ft) above sea level. Unannounced releases of water from upstream Spanish dams occasionally causes navigation issues in these locks. Tauber The Tauber ( German: [ˈtaʊbɐ] ) is a river in Franconia ( Baden-Württemberg and Bavaria ), Germany . It

520-411: The largest four located near the main supports, near the massive rectangular columns, with smaller pillars regularly spaced along the exterior surfaces. These larger columns have elevators that link the deck level to the marginal roadway along the Douro. The elevator volumes, facing the interior of the bridge, include addorsed sculptures. The deck includes six lines of traffic for vehicular traffic (part of

546-431: The name comes from the Portuguese or Spanish term for "golden". In Roman times, the river was personified as a god, Durius . Part of the drainage basin might have been severely depopulated in the 8th century. According to Claudio Sánchez-Albornoz this was a deliberate act by Alfonso I of Asturias for the defence of his Kingdom , which led the area to be named Repoblación . The Douro vinhateiro (vine-land) of

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572-505: The northern half of the Meseta Central . The latter includes wine producing areas such as the Ribera del Duero DOP. The Latin name Durius might have been a Celtic name before the overwhelming Romanization of Iberia. If so, the Celtic root could have been *dubro- (in that family of languages the final vowel sound often changes with context, as in Latin). However, were that the case,

598-583: The river mouth, the only population centres of any note are Foz do Tua, Pinhão and Peso da Régua . Tributaries here are small, merging into the Douro along the canyons; the most important are Côa , Tua , Sabor , Corgo , Tavora , Paiva , Tâmega , and Sousa . None of these small, fast-flowing rivers is navigable. Major Spanish riverside towns include Soria , Almazán , Aranda de Duero , Tordesillas , Zamora and major Portuguese towns include Miranda do Douro , Foz Côa , Peso da Régua , Lamego , Vila Nova de Gaia , and Porto . The most populous cities along

624-480: The river, allowing river traffic into the upper regions in Spain and along the border. In 1998, Portugal and Spain signed the Albufeira Convention, an agreement on the sharing of trans-boundary rivers to include the Douro, Tagus and Guadiana . The convention superseded an agreement on the Douro, signed in 1927, that was expanded in 1964 and 1968 to include tributaries. It is the third-longest river in

650-487: The river. Adjacent areas produce port (a mildly fortified wine) and other agricultural produce. A small tributary of the river has the Côa Valley Paleolithic Art site which is considered important to the archaeological pre-historic patrimony, designated a UNESCO World Heritage Site . Within Spain, it flows through the middle of the autonomous community of Castile and León , with the basin spanning through

676-401: Was the largest of any concrete-arch bridge in the world. In the 1990s, the elevators on the bridge were deactivated. A process to classify the bridge began on 16 February 2011. An announcement was issued on 18 September 2012 (13409/2012) on the project to classify the bridge as a Monumento Nacional ( National Monument ), establishing its respective Special protection Zone. On 24 June 2016,

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