Doubts have been cast over the future of one of Sydney’s top tourist attractions.

Operator Roads and Maritime Services announced on Friday that BridgeClimb Sydney had been unsuccessful in a bid to win a new 20-year contract to operate on the Sydney Harbour Bridge.

A total of four million people form more than 140 countries have climbed the iconic bridge since the experience opened in 1998.

Company chairman and founder Paul Cave said: “It has been a privilege for us to make a hero of the Bridge, and of every climber on every climb. We will continue to create unforgettable memories until our final climber.

“Our team have worked tirelessly to deliver the ultimate experience of Sydney.

“Over 1,500 team members have made a hero of the Bridge, and of every single climber and visitor since 1998.

“Every one of our past and present team can hold their heads high on what we have created together. The team and our customers are our immediate priority.”

He added: “We will not be making any further statements at this time. Our focus is on our customers, our team, and on preserving our brand, equipment and expertise for future opportunities.”