Cape Bridgewater is a striking volcanic headland west of Portland on Victoria's Discovery Coast, with reef diving running out to around 20 m. The cape is fully exposed to swell from south through south-west and only dives well on settled days, but when conditions line up it's outstanding — basalt outcrops covered in kelp, sponge gardens, gorgonian fans, crayfish, abalone, weedy seadragons, blue devils, schools of bullseyes and sweep, plus regular Australian fur seal interactions from the nearby colony. Boat access only, from Portland. Best in light north-east winds with swell under a metre and tide near slack. Use the live 7-day wind and swell forecast on this page to plan. Advanced divers — exposed coast, current around the headland corners, swell wraps in unpredictably on the southern side, plan a settled forecast and have a back-up site in case it picks up.
How far you can see underwater — measured in metres. 10m+ is great, 5–10m is workable, under 3m is murk. Driven by wind, swell, and recent rain.
Long-period waves rolling in from the open ocean. Direction matters more than height — a S swell hits Portsea hard, but an E swell rolls past. Period over 12 s = real ocean punch.
Offshore (N or NE) flattens the surface and clears the water. Onshore (SE through SW) chops it up and stirs sand. Calm or light offshore is the magic combo.
This site faces the open ocean. The exposure caption above shows which directions slam in. Anything from the opposite side gets blocked — that's the safest window.
Slack water — the 30 minutes either side of high or low — is calmest and clearest. Mid-tide brings the most flow. Plan to be down at slack, up before the run picks up.
Bass Strait sits 14–16 °C autumn–winter, 17–19 °C summer. Below 16° a 7 mm hooded keeps you warm for 60 min+. Drysuit if you're going long.