The work is also designed to help protect the city from floods
A multimillion-pound repair project at Bristol's historic docks is set to begin.
The City Docks Capital Project is also designed to help protect the area from the risk of flooding.
The work will be done in three phases. The first stage is to replace the 140-year-old Victorian wooden lock gates at Junction Lock.
The refurbishment programme is expected to take about four years and will cost about £11m.
The work also includes installing a hydraulic system for operating the Junction Lock gates, sluices and paddles.
New steel gates, weighing 50 tonnes each, will replace the 140-year-old pitch-pine wooden gates, which weigh 80 tonnes each.
"This is extremely important and critical work," said Councillor Rosalie Walker, Bristol's cabinet member for culture and healthy communities.
"Our historic harbour is also a working dock and plays a key element in the city's flood defence and flood prevention programme.
"Our ambitious plans for the docks repair and replacement works will safeguard the city for years to come."