Long Jetty is a shallow jetty on the Rockingham foreshore that Howies bluntly calls a pointless dive for adults, while noting that it suits children. With a maximum depth of about 4.5 m and average visibility of around 2 m, it has none of the growth or fish life of the deeper Cockburn Sound jetties.

Its value lies in its shelter and simplicity. The water is flat on most mornings, the depth is safe, facilities are close, and there are pylons to follow, so it is a comfortable place for a first snorkel, a child's introduction to scuba in a supervised programme, or a skills refresher for a returning diver. Small fish shelter around the pylons, and blue swimmer crabs, stars and the occasional ray cross the sand.

Everyone else is better served by the Rockingham Wreck Trail, Kwinana Grain Terminal or Point Peron, all within 10 minutes. Wells Park Jetty, another small site listed by Howies, is a better choice for a children's dive if visibility matters.

There is limited published information about this site. Depths and visibility here come from Howies' site table; its exact position and the name used locally should be confirmed before relying on it.

For completeness, the site is recorded here because it appears in the main Perth shore-dive directories, but it should be treated as a training and family snorkel venue rather than a recreational dive destination. Divers visiting Rockingham for the first time should start with the Wreck Trail, which offers far more to see under similar conditions.

Drive to the Rockingham foreshore via Rockingham Beach Road and park in the foreshore car parks near the jetty. Walk to the beach beside the structure and enter from the sand; depths are shallow from the start. Toilets, showers, cafes and dive shops are close by in Rockingham town centre.

The site is a few minutes from the Wreck Trail and Palm Beach Jetty. Allow about 50 minutes from the Perth CBD.

Sheltered by Cockburn Sound and Point Peron from ocean swell; strong northerlies and north-westerlies are the only winds that make the water rough. The water is shallow and silty, averaging about 2 m visibility, and it gets murkier as the day goes on with swimmers and the summer sea breeze. Go on a calm morning.

Enter beside the jetty and snorkel or dive along the pylons to the end in 4–4.5 m, then back. Keep children close and in the shallows.

No regular operator; occasionally used for children's snorkel and bubblemaker-style sessions.