Stanstead Sluice Replacement Project Information Page

Opens 4 Apr 2022

Closes 31 Dec 2022



The waterways in the Lower Lee valley include the River Lee Navigation, Old River Lea, and the Lee Flood Relief Channel (LFRC).  The LFRC was built between 1949 and 1977 and is designed to carry flood water to reduce the likelihood of flooding in the Lower Lee valley.  Water levels in the LFRC are controlled by a system of weirs, gates and sluices. These maintain water levels for water supply, navigation, amenity and environmental purposes while allowing flood flows to pass during storm events.
Stanstead Sluice is a major flood control structure within the LFRC and is located close to the villages of Stanstead Abbotts and St Margarets.  As well as managing flood risk the sluice is needed to control water levels in the River Lee Navigation.

What we are doing

The gates and operating equipment at Stanstead Sluice are being replaced and improved as the existing ones are now reaching the end of their 50 year working life.

Failure of Stanstead Sluice would result in increased flood risk and the loss of the control of upstream water levels. 

Replacing the sluice gates and their operating equipment will maintain the conveyance of storm flood flows through the structure to sustain the current level of flood management and to maintain the ability to control upstream water levels for navigation, water supply, amenity and environmental needs. 

Improving the environment

The existing sluice acts as a barrier to the free passage of fish and eels.  As part of this project a new fish and eel pass is being constructed to enable the free passage of fish around the sluice. This will help increase the length of watercourses these species can migrate along, extending their range and improving the aquatic biodiversity of the watercourses

How will this impact you?

The earliest the works will be commencing is spring 2022 and are expected to be completed by the end of 2022.  During the works you may notice additional temporary noise and vibrations. 


If you would like any further detail about any of the above information please get in touch at

This activity will open on 4 Apr 2022. Please come back on or after this date to give us your views.


  • Anyone from any background


  • Flood management