Cairns Accelerates Dredging After Cruise Channel Silts Up

Australia’s Ports North has brought forward maintenance dredging in Trinity Inlet after unusually heavy silt buildup reduced water depths in parts of the Cairns cruise channel, preventing some large vessels from safely reaching the port.

The dredging campaign began on September 18 following itinerary changes affecting Carnival Encounter and Carnival Splendor.

Parts of the navigation channel have fallen below its designed depth of nine meters, limiting access to the Cairns Cruise Liner Terminal. The situation has already resulted in one Carnival ship being diverted approximately 350 kilometers south to Townsville, while another was required to make a tender call at Yorkeys Knob instead.

Queensland maritime authorities issued a navigation notice on September 18 covering dredging operations in Cairns Harbour and the Cairns Channel. The work is expected to continue until early November.

Silt has accumulated in Trinity Inlet at a faster rate than normal, reducing the available depth and making it unsafe for certain deep-draft cruise ships to navigate the channel.

Passengers booked on Carnival Encounter’s September 5, 2026 departure from Brisbane were informed four days before sailing that the ship would no longer be able to visit Cairns.

“Current channel depths have reduced and are now too shallow to allow for the safe passage of our ship,” the line said in its guest notice.

The 108,865-gross-ton Carnival Encounter, which accommodates approximately 2,600 passengers, continued with its scheduled September 7 call at Willis Island. Its visit to Airlie Beach was moved forward to September 8, taking the place of the planned Cairns call, while Townsville was added to the itinerary for September 9.

Carnival automatically refunded prepaid shore excursions for Cairns. Once passengers were onboard, excursions in Townsville were made available through the Carnival HUB app and the Carnival Adventures Desk.

The revised itinerary also changed the ship’s scheduled return to Brisbane on September 11 from 7 a.m. to 8 a.m. Carnival did not provide details of any compensation for passengers whose onward travel plans may have been affected by the one-hour delay.

Townsville was able to accommodate Carnival Encounter following the completion of an A$251 million channel-widening project. The development was designed to allow the port to receive vessels measuring up to approximately 300 meters in length.

The cancellation meant Cairns businesses missed out on potential spending from around 2,600 passengers and approximately 1,100 crew members. The affected navigation channel provides access to the Cairns Cruise Liner Terminal at Trinity Wharf. Its location within walking distance of restaurants, stores and tour operators means visiting cruise passengers can contribute directly to the local economy.

Carnival Encounter is currently scheduled to leave Brisbane again on September 26 for another Great Barrier Reef itinerary. That cruise includes an overnight visit to Cairns beginning September 29. When Carnival informed guests about the earlier cancellation, the cruise line had not announced any changes to this subsequent Cairns call.