Work to refurbish St Helier Marina is due to begin in September
The old piles and pontoons will be replaced as part of a £3.5 million investment by Ports of Jersey.
The facility turned 40 this year, and this is the first major refurbishment of its pontoons, which provide permanent and visitor moorings.
Local contractor Geomarine was chosen to carry out the work.
The marina will be drained enough to remove the pontoons and piles and put in the new ones.
Vessels using the moorings will be moved temporarily or stored ashore.
Harbourmaster Captain Bill Sadler says they'll inevitably be disruption but it'll be outweighed by the benefit when the upgrade us finished, which is expected to be next May:
"We have consulted and engaged extensively with local boat owners, marine traders, and yacht clubs who have helped us consider the options and design layouts.
"We welcomed their feedback and the final solution was that the existing layout of St Helier was the preferred most ergonomic option and was overwhelmingly supported by them. It’s inevitable that with such a large project there will be some disruption and impact on our boat owners in this marina, but the overall benefits once completed we believe will far outweigh this temporary disruption".