If you follow that link you'll get the full story. But here's my take on it... with my own recollections and observations thrown in. Yes, it is a relic of a 19th Century NSW Government initiative to create water transport, one of just 2 in that state and 3 total in Australia; and yes, it was based upon the English canal system. It partly used unemployed labour in its construction. The canal itself played its part in the draining and in-filling of large areas of low-lying in the Alexandria and Botany area, opening it up for development.
It's worth a look. Intact original sections of the "fascine-dyke sandstone construction" are apparently rare examples of late 19th century coastal engineering works. They certainly look it, too. My favourite views of this barely-navigable canal were from the Ricketty Street bridge (love that name) and along Airport Drive (where I spent many hours watching and photographing aircraft landing, of course). Some parts of the Cooks River are lined in the same way.
Alexandra Canal is also known as Shea`s Creek, a tributary of the Cooks River, and it begins in what were once the sandy hills of the present Surry Hills, north of Redfern. The sand hills themselves are long gone but stretched east to South Dowling Street (where Australian Glass Manufacturers set up a factory, strangely enough) and south to Botany and the marshes that surrounded northern Botany Bay. Dredging commenced in 1887 to adapt Shea`s Creek to a canal, starting with a junction with the Cooks River, south-west of the existing Sydenham-to-Botany railway bridge. It extended north only so far as the Canal Road Bridge - and had to be re-aligned somewhat as the airport expanded.
However plans were afoot to extend to Buckland Street, Redfern - which would have been interesting indeed, had it happened. Apparently that extension only got as far as Huntley Street, Alexandria (in about 1897) before political will died away. We all know what that's like.
Other interesting bits from that URL above:
- During construction, scientists were called in to record the finding of dugong bones displaying butchery marks, aboriginal stone axes and remnants of an ancient forest
- Wharves were constructed along the canal to encourage its use
- A similar development occurred on the south side of the Cooks River, with Muddy Creek reconstructed as a canal as far south as Bestic Street between 1893 and 1895
- Development of the Alexandra Canal ceased in 1912.
Enough about the canal, what of the Airport? Again drawing heaving from that link, but with my observations added, the airport was significantly expanded from 1947. The airport land was expanded to include much of what had been Sydney's water supply reservation (near the old Mill Pond, ie the south-east corner of the field, now variously helicopter and car parking as well as roadway) as well as former Rockdale Sewage Farm land (near Muddy Creek), the F. T. Wimble and Co. Ltd Ink Factory (unsure where that was), the Mascot Granite Works (or that) and the whole of the suburb of Lauriston Park (which of course is pretty much the core street scape of the "domestic" terminal area - severed from surrounding suburbs by the Botany Goods railway line.
Much of the "new" east-west (07/25) runway was constructed along the centre of the existing Cooks River, requiring a major diversion. The diverted river was placed on the western boundary of the airport, with a hard turm to the south instead of a gentle meander across the airfield. Whereas it once flowed out to the Bay near the Mill Pond, it now exited next to what became the site of the 1970s Control Tower. Some houses in that area were also marooned when the river moved.
The excavated material and sand went to the aerodrome to raise the level of the runways and to fill the old Cooks River alignment. You can see a swampy area created by the removal of the river in maps and photos of the time, to the north of the intersection of the 2 main runways. Later, after the new runways were operating, the Alexandra Canal south of the railway bridge, including a surviving stretch of what was the Cooks River, were realigned, the original Canal and riverbed filled and a new channel cut through further to the west. This work created some more space for airport buildings to the north, including the international terminal, and was complete to my recollection by 1969. A new road bridge over the Canal was built during construction of the terminal, later becoming restricted to pedestrian and cycle traffic only. That of course was my favoured way to get to the International Terminal - a bus to Tempe bus (formerly tram) depot, then a stroll over the old construction bridge to the new terminal.
Also in this general area is a rail/tram interchange at Arncliffe, from whence ballast and sand was also transported across the tram network. Just thought you should know that.