Tasman Bridge disaster

Tasman Bridge

Tasman Bridge from east following collision, 1975
Locale
Hobart, Tasmania. Australia
Collapse
Hit by Lake Illawarra	5 January 1975
Crosses
Derwent River, Hobart.

The Tasman Bridge disaster occurred on the evening of 5 January 1975, in Hobart, the capital city of Australia's island state of Tasmania, when a bulk ore carrier travelling up the Derwent River collided with several pylons of the Tasman Bridge, causing a large section of the bridge deck to collapse onto the ship and into the river below. Twelve people were killed, including seven crew on board the ship, and the five occupants of four cars which fell 45 m (150 feet) after driving off the bridge. The disaster severed the main link between Hobart and its eastern suburbs, and is notable for the social impacts that resulted from the loss of such an important road artery.

The collision occurred at 9:27 pm (Australian Eastern Summer Time UT+11) on Sunday 5 January 1975. The bulk carrier Lake Illawarra, carrying 10,000 tonnes of zinc ore concentrate, was heading up the Derwent River to offload its cargo to the Electrolytic Zinc Company at Risdon, upstream from Hobart and about 3 km from the bridge. The 1,025m long main viaduct of the bridge was composed of a central main navigation span, two flanking secondary navigation spans, and 19 approach spans. The ship was off course as it neared the bridge, partly due to the strong tidal current but also because of inattention by the ship's master, Captain Boleslaw Pelc. Initially approaching the bridge at eight knots, Pelc slowed the ship to a 'safe' speed. Although the Lake Illawarra was capable of passing through the bridge's central navigation span, the captain attempted to pass through one of the eastern spans.

Despite several changes of course, the ship proved unmanageable due to its insufficient speed relative to the current. In desperation the captain ordered 'full speed astern', at which point all control was lost. The vessel drifted towards the bridge midway between the central navigation span and the eastern shore, crashing into the pile capping of piers 18 and 19, bringing three unsupported spans and a 127 m section of roadway crashing into the river and onto the vessel's deck. The ship listed to starboard and sank within minutes in 35 m of water a short distance to the south. Seven crew members on the Lake Illawarra were trapped and drowned. The subsequent marine court of inquiry found that the captain had not handled the ship in a proper and seamanlike manner, and his certificate was suspended for six months.

As the collision occurred on a Sunday evening, there was relatively little traffic on the bridge. While no cars were travelling between the 18th and 19th pylons when that section collapsed, four cars drove over the gap, killing five occupants. Two drivers managed to stop their vehicles at the edge, but not before their front wheels had dropped over the lip of the bridge deck. One of these cars contained Frank and Sylvia Manley.