| Fort Denison | |
|---|---|
Mattewanye (Dharuk) | |
Fort Denison pre-1885. | |
![]() Interactive map of the Fort Denison area | |
| Former names | Pinchgut |
| Etymology | Sir William Thomas Denison |
| General information | |
| Status | Built as afortress. Decommissionedcirca 1930s. Now used as anational park; reserve; tourist facility; function space |
| Type | Military fortress;gunnery |
| Architectural style | Colonial fortification,castellated style |
| Location | Sydney Harbour, North ofWoolloomooloo |
| Construction started | 1841 |
| Completed | 14 November 1857 (1857-11-14) |
| Closed | circa 1930s |
| Height | |
| Observatory | Martello tower |
| Technical details | |
| Material | Sydney sandstone |
Fort Denison with itsMartello tower | |
| Location | Port Jackson,Sydney Harbour National Park |
| Nearest city | Sydney |
| Coordinates | 33°51′18″S151°13′32″E / 33.8549°S 151.2255°E /-33.8549; 151.2255 |
| Operator | NSW National Parks & Wildlife Service |
| fortdenison | |
| Official name | Fort Denison; Pinchgut; Mattewanye (Eora name) |
| Type | State heritage (built) |
| Designated | 2 April 1999 |
| Reference no. | 985 |
| Type | Fortification |
| Category | Defence |
| Builders | William Randle |
| Official name | Fort Denison, Sydney, NSW, Australia |
| Designated | 21 March 1978 |
| Reference no. | 1856 |
| References | |
| [1] | |
Fort Denison, part of theSydney Harbour National Park, is aheritage-listed formerpenal site anddefensive facility occupying a small island located north-east of theRoyal Botanic Garden and approximately 1 kilometre (0.62 mi) east of theOpera House inSydney Harbour,New South Wales,Australia. The island may have been known asMattewanye orMuddawahnyuh in theEora language[citation needed], and asPinchgut Island.
The site containstime gun,navigational aids andtide gauge facilities. Correctional and military facilities were designed by George Barney and built from 1840 to 1862 by William Randle. The property is owned by theOffice of Environment & Heritage, anagency of theGovernment of New South Wales. It was added to theNew South Wales State Heritage Register on 2 April 1999.[2] In 1978 the former fortress was listed on the (now defunct)Register of the National Estate,[1] and is currently used as a national park, nature reserve, tourist facility, and as a function space.
![]() Interactive map of Pinchgut | |
| Location | Sydney Harbour,New South Wales, Australia |
|---|---|
| Status | Closed |
| Security class | Maximum; isolation |
| Opened | 1788 |
| Former name | Rock Island |
| Managed by | New South Wales Colonial Government |
After theFirst Fleet arrived in 1788,Governor Phillip and his advocate-general used the name "Rock Island". In 1788, a convict named Thomas Hill was sentenced to a week on bread and water in irons there. The island came to be known as "Pinchgut".[3] Once a 15-metre (49 ft) high or higher sandstone islet, the rock was levelled by convicts under the command ofCaptain George Barney, the civil engineer for the colony, who quarried it forsandstone to construct nearbyCircular Quay.
In late 1796 the Governor had installed agibbet on Pinchgut. A convict to be hanged and then gibbeted there was Francis Morgan. In 1793, the British transported him to New South Wales for life as punishment for a murder. The authorities in NSW executed Morgan for bashing Simon Raven to death in Sydney on 18 October 1796.[4] On 30 November 1796, Morgan was hanged; following his execution, his body was hung in chains (gibbeting) on Pinchgut. His skeleton was still hanging there four years after his execution. He said to the hangman that the only thing worth mentioning was the superb view of the harbour from his high elevation, and that he was sure there were no waters the world over to compare with it for beauty.
In 1839, two American warships entered the harbour at night and circled Pinchgut Island. Concern with the threat of foreign attack caused the government to review the harbour's inner defences.Barney, who had earlier reported that Sydney's defences were inadequate, recommended that the government establish a fort on Pinchgut Island to help protect Sydney Harbour from attack by foreign vessels. Fortification of the island began in 1841 but was not completed. Construction resumed in 1855 because of fear of aRussian naval attack during theCrimean War, and was completed on 14 November 1857. The newly built fort then took its current name fromSir William Thomas Denison, the Governor of New South Wales from 1855 to 1861.
The fortress features a distinctiveMartello tower, the only one ever built in Australia and the last one ever constructed in theBritish Empire. It was constructed using 8,000 tonnes (7,900 long tons) of sandstone from nearby Kurraba Point,Neutral Bay. The tower's walls are between 3.3–6.7 metres (11–22 ft) thick at the base and 2.7 metres (8 ft 10 in) thick at the top. However, developments in artillery rendered the fort largely obsolete by the time it was completed. The tower itself had quarters for a garrison of 24 soldiers and one officer. Fort Denison's armament included three 8-inch (200 mm) muzzle loaders in the tower, two 10-inch (250 mm) guns, one on a 360-degree traverse on the top of the tower and one in a bastion at the other end of the island, and twelve 32-pound (15 kg) cannons in a battery between the base of the tower and the flanking bastion.
Eventually all the guns were removed, except for the three 8-inch (200 mm) muzzle-loading cannons in the gun room in the tower, which were installed before construction was complete. The passages within the tower are too narrow to permit these to be removed. However, from the beginning the three cannons were of limited utility. Theembrasures for the cannons were too small to use the guns effectively and by the time a cannon was loaded the ship it was to fire on would have sailed past. Lastly, the guns'recoil was too powerful for the small room.[citation needed]
In 1906, a saluting gun (pictured below) was transferred from Dawes Point to Fort Denison.
In 1913 alighthouse beacon built in Birmingham, England, and shipped to Sydney, replaced the 10-inch (250 mm) gun on the roof of the tower. The light is calledFort Denison Light, which is still in use.


In May 1942, three Japanesetwo-man midget-submarinesattacked Sydney Harbour. When the US Navy cruiserUSS Chicago fired on the Japanese, some of its 5-inch (130 mm) shells hit Fort Denison, causing the tower minor damage which remains visible.
In October 1900, as theBoer war raged in Africa, theWhite Star Line shipSS Medic sailed into Sydney Harbour and dropped anchor inNeutral Bay. One night, the fourth officer,Charles Lightoller and two shipmates rowed to Fort Denison and climbed the tower with a plan to fool locals into believing aBoer raiding party was attacking Sydney. They hoisted a makeshift Boer flag on the lightning conductor and fired a harmless wad of cotton waste from one of the 8-inch cannons.[5][6] The blast shattered a few of the fort's windows but caused no other damage. Lightoller was never apprehended but confessed to his company's superiors and related the whole story in an autobiography.[7] He was transferred to the Atlantic route and went on to be the second officer of theRMS Titanic and the most senior officer to survive the1912 sinking of the ship. He was a key witness at both the British and American inquiries into the disaster.
Since 1992, theNSW National Parks & Wildlife Service, which manages the site, has spent around A$2m conserving and upgrading the facilities.EnergyAustralia also made a significant contribution for the work via the Foundation for National Parks and Wildlife.[8]
Following publication of a conservation plan, further renovation commenced in 1999 and was completed in 2001. The conservation and adaptive re-use of the island was awarded theNSW Royal Australian Institute of Architects (RAIA) Conservation Award; a Commendation in the National RAIA Awards; and aNational Trust Heritage Award in 2001.
Increased harbour traffic has already destroyed the slipway. Furthermore, the porous sandstone drinks in the salt right down to the fort's foundations. In 2007 the government announced a $1.5 million rescue package. Fort Denison is now home to more than 100 birds.

Fort Denison remains closed to visitors for service upgrades and conservation works until mid-2025. Fort Denison is a museum, tourist attraction, restaurant, and popular location for wedding receptions and corporate events. The tourist facility contains an exhibition of the island's history from Aboriginal times. Access to Fort Denison is via aferry that departs Wharf 6 at Circular Quay every 45 minutes, 7 days a week. The price of the ferry ticket includes the landing fee. Guided tours of the island, including the Martello tower are at an additional cost. NSW National Parks & Wildlife Services conducts the tours.
In 2004 the NSW National Parks & Wildlife Service restored the lighthouse beacon, which is still in use and supports operation of a Harbour Navigational Facility, withtide gauge, navigation channel markers,foghorn and beacon, established in the mid-19th century. TheBureau of Meteorology operates a weather facility from the island and publishes observations at half-hourly intervals on its website.[9]
The custom of firing a gun daily at 1pm began in 1906 to enable sailors to set theirship'schronometers correctly. The daily gun continued untilWorld War II when the authorities stopped it for fear of alarming residents. The practice recommenced in 1986.[10]
The Fort Denison Restaurant was opened on the island in 2006, although the restaurant lease expired in June 2017 and is yet to be renewed. Throughout the years since it has been voted in the top five waterfront restaurants worldwide byThe Sydney Morning Herald, and was open for lunch seven days a week year round, dinners on a Sunday, and for special events and occasions which can be found on their website.[11] Bookings for major occasions, such as New Year's Eve, were coveted.
Fort Denison was the location of the 1959 filmThe Siege of Pinchgut, released in the United States asFour Desperate Men. Directed byHarry Watt, written byJon Cleary and starringAldo Ray, the production was the final Australian film of the British-basedEaling Studios. The island also featured as the base of operations for Neville Savage in the sixth episode of the Australian children's television showMission Top Secret. Fort Denison was often seen in the television seriesWater Rats. One episode in season two of the show,End of the Line, featured a party on the island.
Fort Denison on Sydney Harbour is within the visual catchment of theSydney Opera House, theSydney Harbour Bridge, the Royal Botanic Garden and the Sydney Harbour Naval Precinct.[12][2] Fort Denison is the only Sydney Harbour island which is no longer described as an island. Even Garden Island, now visually part of the mainland (and anything but a garden) is still known as an island. The island known as Mattewanye (small rocky island) to Aborigines and Rock Island to the first settlers, is now popularly known as Fort Denison and viewed as a built artefact rather than an island.[2]
From a distance no evidence of its original island character is apparent, except perhaps scattered rocks at low tide. However, on close inspection thesandstone bedrock visible below the south west battery reveals part of the rock of the island, particularly when combined with the pictorial evidence provided by drawings such as that by Barrington in 1802.[2]
As at 26 May 2014, the physical condition is excellent. Archaeological potential is high.[2] Published material on such towers in the English speaking world suggests that this may well be the most intact tower.[15][2]
The following modifications have been made to Fort Denison:[2]
Fort Denison was listed on theNew South Wales State Heritage Register on 2 April 1999 .[2]
Tides have been measured at Fort Denison since 1857 on completion of the fort, initially using a bench mark cut into the stonework of the Martello Tower. From 1867 successive instruments were used as tide measuring technology developed.[16][17] (The measurements since 1914 are graphed byBureau of Meteorology).[18]
The Fort Denison photographs below show float activated tide gauge instruments in a cabinet and the system's stilling well.[19] A wire connected to the upper drum mechanism passes out through the bottom right of the cabinet and runs over a pulley to drop down to the float system in the large pipe in the well. This system is now obsolete at Fort Denison but maintained as a museum exhibit. To the right of the large pipe in the well is an enclosed pipe which rises to the active modern system.
Tide heights and times at Fort Denison are the primary base referent for published tide information for other places in the state of New South Wales.
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This Wikipedia article contains material fromFort Denison, entry number 00985 in theNew South Wales State Heritage Register published by the State of New South Wales (Department of Planning and Environment) 2018 underCC-BY 4.0licence, accessed on 2 June 2018.