Bulk Jetty is an industrial jetty on the eastern shore of Cockburn Sound that Bucket List Diver rates among the prettiest shore dives in Perth, while others see it mainly as a reliable site when everything else is blown out. Both views have a point. The structure is about 250 m long and slopes gently from about 3 m at the shore end to 8.5 m down the centre, with open water to 15 m beyond the end and sides.

The pylons and the debris-strewn seabed give it an odd character; Howies compares the bottom to a moon landing. Among the rubble live some very large sea stars, some up to a metre across, along with blue swimmer crabs, razor clams, mussel clumps and, in places, blue-ringed octopus. The pylons are encrusted with sponges, ascidians and soft growth and hold small reef fish, leatherjackets and old wives, and nudibranchs and other macro life reward a slow search.

The jetty needs solid buoyancy. Nets, ropes and cables lie around the pylons, the bracing sits at head height at the surface, and the silt comes up quickly. Visibility averages about 3 m. There is no dive flag on site, and industrial boat traffic works nearby, so bring your own flag.

Bulk Jetty suits Open Water divers with good buoyancy who want a shore dive on a windy day, and photographers interested in pylon macro and the oversized sea stars. It is a short drive from KGT and the Rockingham sites, so it is easy to combine with them.

From Rockingham Road turn onto Beard Street, right onto Leath Road and left onto Barter Road, then follow to the bottom of Riseley Road, Kwinana Beach (Horse Beach). Park in the free sand-and-gravel car park and kit up there. It is about 50 m of soft sand to the beach and a 30–50 m surface swim: enter under the building on top of the jetty, swim along about 30 m and descend.

Swim out along one side under the structure and back along the other.

Local divers call Bulk Jetty a poor-weather site: it is protected by Cockburn Sound and diveable when the ocean coast is closed. Northerly winds set up a current along the jetty and westerlies push in swell and stir the silt. Visibility is typically 2–5 m and rarely better than 6 m.

Mornings before the summer sea breeze are best. Industrial activity in the area can affect water quality after rain.

Descend after about 30 m under the jetty in 3 m and follow one line of pylons seaward; the centre is about 8.5 m. Explore the debris and large sea stars, then cross and return along the other side. The open water beyond the ends and sides drops to about 15 m, but there is less to see there.

Stay low under the structure and watch for overhead bracing on ascent.

Used by Perth dive schools, including Bucket List Diver, for guided shore dives; otherwise dived independently.