Thames Area Information


Welcome to the new Engagement HQ Page for all things River Thames.

This page covers the River Thames within the Environment Agency's jurisdiction, from Cricklade to Teddington,


Here you will find all the latest news and updates about the river and our work, including information on locks, weirs, boat moorings, monitoring stations, flood defences, bridges and more.

Our work helps to protect people, property and the environment from flooding, drought and pollution.


We regularly receive enquiries about our work on and around the River Thames. This page will highlight the topics and areas of our work that generate the most interest, making it eaisier to find the information you need.


If you are interested in a topic that is not currently covered on this site, please contact our enquiries team at enquiries_THM@environment-agency.gov.uk.



How To Use This Page


Please use the map below to determine which river catchment your query relates to. Each catchment of the river is split by the red markings and labelled A-G. You can then visit the ‘Whats In My Area’ section to access information relevant to that catchment.

Other pages containing information that is relevant to the River Thames and wider area, including our National Navigation page and information on Flood Alleviation Schemes, can be found under the relevant drop down menus. You will also find other useful resources and information on how to contact us.

The information across our pages is kept up to date and is the latest information we are able to share. Links to latest updates will always be posted in the news feed

Keep up to date with the latest news and updates by registering and subscribing to follow this page.



The Environment Agency can carry out maintenance, improvement, or construction work on main rivers to manage flood risk and protect the environment. This is done using our permissive powers under the Water Resources Act 1991. You can learn more about the Water Resources Act 1991 through this link. Any work we carry out using these powers is subject to available funding and resources.


Responsibility for maintaining main rivers ultimately remains with the riparian land owner. All watercourses not designated main river are ordinary watercourses and the Lead Local Flood Authority has similar permissive powers on these. To find out more about riparian responsibilities visit the two links below:





Welcome to the new Engagement HQ Page for all things River Thames.

This page covers the River Thames within the Environment Agency's jurisdiction, from Cricklade to Teddington,


Here you will find all the latest news and updates about the river and our work, including information on locks, weirs, boat moorings, monitoring stations, flood defences, bridges and more.

Our work helps to protect people, property and the environment from flooding, drought and pollution.


We regularly receive enquiries about our work on and around the River Thames. This page will highlight the topics and areas of our work that generate the most interest, making it eaisier to find the information you need.


If you are interested in a topic that is not currently covered on this site, please contact our enquiries team at enquiries_THM@environment-agency.gov.uk.



How To Use This Page


Please use the map below to determine which river catchment your query relates to. Each catchment of the river is split by the red markings and labelled A-G. You can then visit the ‘Whats In My Area’ section to access information relevant to that catchment.

Other pages containing information that is relevant to the River Thames and wider area, including our National Navigation page and information on Flood Alleviation Schemes, can be found under the relevant drop down menus. You will also find other useful resources and information on how to contact us.

The information across our pages is kept up to date and is the latest information we are able to share. Links to latest updates will always be posted in the news feed

Keep up to date with the latest news and updates by registering and subscribing to follow this page.



The Environment Agency can carry out maintenance, improvement, or construction work on main rivers to manage flood risk and protect the environment. This is done using our permissive powers under the Water Resources Act 1991. You can learn more about the Water Resources Act 1991 through this link. Any work we carry out using these powers is subject to available funding and resources.


Responsibility for maintaining main rivers ultimately remains with the riparian land owner. All watercourses not designated main river are ordinary watercourses and the Lead Local Flood Authority has similar permissive powers on these. To find out more about riparian responsibilities visit the two links below:




  • UPDATE- Penton Hook Island Closure

    supporting image

    There has been an update to our Penton Hook Island Closure page.

    For latest information CLICK HERE


    Penton Hook Island has been closed to public access since February 2025 following the identification of widespread tree safety issues, principally associated with Ash Dieback disease. Surveys and subsequent assessments concluded that a significant proportion of the island's tree stock presents an unacceptable risk of falling branches and tree failure. The island contains approximately 300 mature trees and has become an important local amenity and location for numerous informal memorial trees and benches, making the issue particularly sensitive for the local community.

    There has been an update to our Penton Hook Island Closure page.

    For latest information CLICK HERE


    Penton Hook Island has been closed to public access since February 2025 following the identification of widespread tree safety issues, principally associated with Ash Dieback disease. Surveys and subsequent assessments concluded that a significant proportion of the island's tree stock presents an unacceptable risk of falling branches and tree failure. The island contains approximately 300 mature trees and has become an important local amenity and location for numerous informal memorial trees and benches, making the issue particularly sensitive for the local community.

Page last updated: 25 Sep 2026, 03:36 PM