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Portland Harbour
Portland Harbour is beside the Isle of Portland, Dorset, on the south coast of England. Construction of the harbour began in 1849; when completed in 1872, its 520-hectare (1,300-acre) surface area made it the largest human-made harbour in the world, and it remains one of the largest in the world today. It is naturally sheltered by Portland to the south, Chesil Beach to the west and mainland Dorset to the north. It consists of four breakwaters: two southern and two northern. These have a total length of 4.57 km (2.84 mi) and enclose approximately 1,000 ha (2,500 acres) of water.
Portland Harbour was built by the Admiralty as a facility for the Royal Navy (though access was also available to merchant ships); on 11 December 1923 it was formally designated HM Naval Base (HMNB) Portland, and continued to serve as such until closure in 1995.
The original harbour was naturally sheltered by the south coast of England, Chesil Beach and the Isle of Portland, providing refuge for ships against weather in all directions except east. The harbour had already been used by ships for centuries when, in the 16th century, King Henry VIII built Portland Castle and Sandsfoot Castle to defend the anchorage. Prompted by the expansion of the French naval port of Cherbourg, just across the English Channel, the Royal Navy established a base at Portland in 1845; a scheme for the harbour to be transformed into a refuge had been granted parliamentary approval the year before. Portland was the first naval anchorage specifically designed for the new steam navy. Similar harbours of refuge would be built at Alderney, Dover, Holyhead, and later (in response to the increased naval threat from Germany) at Peterhead.
Construction of the two breakwaters began in 1849 when HRH Prince Albert laid the foundation stone on 25 July. Designed by engineer James Meadows Rendel, the work was carried out under civil engineer John Towlerton Leather, with Rendel as engineer in chief (until his death in 1856), and John Coode as resident engineer. During 1848, HM Prison Portland was established to provide convict labour to quarry the stone needed to construct the breakwaters and the harbour defences. Known as the Admiralty Quarries, they provided 10,000 tons of stone per week. The breakwaters were declared complete by HRH Edward the Prince of Wales on 10 August 1872. A major government project, the construction work had become Dorset's greatest tourist attraction of its time.
The initial southern breakwaters were built between 1849 and 1872; meanwhile, various defences were created to defend the harbour. The Verne Citadel, designed by Captain Crosman R.E., was built at Verne Hill between 1860 and 1881: the 56 acre (23 ha) fortress was designed for 1000 troops and had gun emplacements facing seawards on three sides. Below the eastern side of the citadel, East Weare Battery was built during the 1860s, along with the detention barracks East Weare Camp. On the end of the inner breakwater was the Inner Pierhead Fort, and on the outer breakwater the circular Breakwater Fort. On Weymouth's side of the harbour, the Nothe Fort was built at the end of the Nothe Peninsula, and completed in 1872. In 1892, the Verne High Angle Battery was built in a disused quarry near the Verne Citadel, but was decommissioned in 1906.
As part of further defence works against the threat of torpedo attack, the harbour's two northern breakwaters were built between 1893 and 1906. In 1902, additional defences were constructed, including Upton Fort at Osmington and Blacknor Fort on the western side of Portland. By 1903, the East Weares Rifle Range served the navy and other military on the eastern side of the island. In 1905, the Portland Breakwater Lighthouse was erected on the southern end of northeast breakwater, where it continues to operate today.
The harbour was envisaged primarily as a coaling station for the Royal Navy, being conveniently equidistant from the Royal Navy's two principal bases at Portsmouth and Devonport; however it was also where the Channel Squadron was based, newly re-formed in 1858.
In the 20th century, Portland became increasingly renowned for its training and research facilities.
Hub AI
Portland Harbour AI simulator
(@Portland Harbour_simulator)
Portland Harbour
Portland Harbour is beside the Isle of Portland, Dorset, on the south coast of England. Construction of the harbour began in 1849; when completed in 1872, its 520-hectare (1,300-acre) surface area made it the largest human-made harbour in the world, and it remains one of the largest in the world today. It is naturally sheltered by Portland to the south, Chesil Beach to the west and mainland Dorset to the north. It consists of four breakwaters: two southern and two northern. These have a total length of 4.57 km (2.84 mi) and enclose approximately 1,000 ha (2,500 acres) of water.
Portland Harbour was built by the Admiralty as a facility for the Royal Navy (though access was also available to merchant ships); on 11 December 1923 it was formally designated HM Naval Base (HMNB) Portland, and continued to serve as such until closure in 1995.
The original harbour was naturally sheltered by the south coast of England, Chesil Beach and the Isle of Portland, providing refuge for ships against weather in all directions except east. The harbour had already been used by ships for centuries when, in the 16th century, King Henry VIII built Portland Castle and Sandsfoot Castle to defend the anchorage. Prompted by the expansion of the French naval port of Cherbourg, just across the English Channel, the Royal Navy established a base at Portland in 1845; a scheme for the harbour to be transformed into a refuge had been granted parliamentary approval the year before. Portland was the first naval anchorage specifically designed for the new steam navy. Similar harbours of refuge would be built at Alderney, Dover, Holyhead, and later (in response to the increased naval threat from Germany) at Peterhead.
Construction of the two breakwaters began in 1849 when HRH Prince Albert laid the foundation stone on 25 July. Designed by engineer James Meadows Rendel, the work was carried out under civil engineer John Towlerton Leather, with Rendel as engineer in chief (until his death in 1856), and John Coode as resident engineer. During 1848, HM Prison Portland was established to provide convict labour to quarry the stone needed to construct the breakwaters and the harbour defences. Known as the Admiralty Quarries, they provided 10,000 tons of stone per week. The breakwaters were declared complete by HRH Edward the Prince of Wales on 10 August 1872. A major government project, the construction work had become Dorset's greatest tourist attraction of its time.
The initial southern breakwaters were built between 1849 and 1872; meanwhile, various defences were created to defend the harbour. The Verne Citadel, designed by Captain Crosman R.E., was built at Verne Hill between 1860 and 1881: the 56 acre (23 ha) fortress was designed for 1000 troops and had gun emplacements facing seawards on three sides. Below the eastern side of the citadel, East Weare Battery was built during the 1860s, along with the detention barracks East Weare Camp. On the end of the inner breakwater was the Inner Pierhead Fort, and on the outer breakwater the circular Breakwater Fort. On Weymouth's side of the harbour, the Nothe Fort was built at the end of the Nothe Peninsula, and completed in 1872. In 1892, the Verne High Angle Battery was built in a disused quarry near the Verne Citadel, but was decommissioned in 1906.
As part of further defence works against the threat of torpedo attack, the harbour's two northern breakwaters were built between 1893 and 1906. In 1902, additional defences were constructed, including Upton Fort at Osmington and Blacknor Fort on the western side of Portland. By 1903, the East Weares Rifle Range served the navy and other military on the eastern side of the island. In 1905, the Portland Breakwater Lighthouse was erected on the southern end of northeast breakwater, where it continues to operate today.
The harbour was envisaged primarily as a coaling station for the Royal Navy, being conveniently equidistant from the Royal Navy's two principal bases at Portsmouth and Devonport; however it was also where the Channel Squadron was based, newly re-formed in 1858.
In the 20th century, Portland became increasingly renowned for its training and research facilities.