Meet the site
Jervoise Bay is a sea-wall and jetty dive that most Perth divers keep for days when everything else is closed. Man-made rock groynes and a concrete jetty protect the Cockburn Power Boat Club ramps on the south side of Woodman Point, and the water between them stays sheltered in weather that makes the open coast undiveable. Depth runs from the shallows to about 10 m along the outer walls.
The life is better than the setting suggests. Banded toadfish are everywhere and very curious. Colonies of zoanthids about a metre across cover some boulders, grey fan sponges 50–70 cm tall stand along the walls, and there are small corals, nudibranchs, filefish and leatherjackets. Giant cuttlefish are regular visitors, particularly in the cooler months, and the shallows under the concrete jetty are often the clearest part of the dive.
The drawbacks are real. The bottom is fine silt that clouds with one careless kick, so visibility of 3–4 m can drop to nothing behind a group. Entries and exits over the jagged rocks at the groyne corners need care, and an easy entry can become a hard exit if you surface in the wrong place. This is a working boat ramp, so stay out of the launch lanes and use a flag.
Jervoise Bay suits experienced shore divers with good buoyancy who want a dive on a windy day, and photographers after toadfish, zoanthids and cuttlefish. It is not a first choice for beginners or groups. Divers who log it regularly say the best results come from diving slowly in small buddy pairs, early on a weekday, before the ramp gets busy.
What you might see
Banded toadfish, zoanthid colonies, grey fan sponges, giant cuttlefish, nudibranchs, filefish, leatherjackets, small corals, blennies
Location
Rock sea walls and a concrete jetty at the Cockburn Power Boat Club boat ramps in Jervoise Bay, on the south side of Woodman Point.
Facilities nearby
Large car park at the public boat ramps; limited facilities (toilets at the boat club area when open). Air fills in Fremantle and Spearwood.
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
howiesscuba.comhowiesscuba.comoddiseas.comRecord updated 26 Sept 2026. Source claims are being reviewed.