River Thames conditions - advice for boaters

Page Last Updated: 4 March 2021 13:07   

Thames Map Thumbnail

Welcome to the Environment Agency's online River Thames conditions update service which displays our current advice to river users. We display warning boards at our locks to inform river users of conditions that may make navigating difficult and dangerous.

This page shows our current advice for each reach of the river between Cricklade and Teddington. We will update this information regularly when warning boards are being displayed at locks and as river conditions change.

Lechlade to Oxford Back to Map

ReachCurrent conditions
Upstream of St John's LockCaution stream decreasing
St John's Lock to Buscot LockCaution strong stream
Buscot Lock to Grafton LockCaution stream decreasing
Grafton Lock to Radcot LockCaution strong stream
Radcot Lock to Rushey LockCaution stream decreasing
Rushey Lock to Shifford LockCaution stream decreasing
Shifford Lock to Northmoor LockCaution strong stream
Northmoor Lock to Pinkhill LockCaution stream decreasing
Pinkhill Lock to Eynsham LockCaution strong stream
Eynsham Lock to King's LockCaution strong stream
King's Lock to Godstow LockCaution strong stream
Godstow Lock to Osney LockCaution strong stream
Osney Lock to Iffley LockCaution stream decreasing

Oxford to Henley Back to Map

ReachCurrent conditions
Iffley Lock to Sandford LockCaution stream decreasing
Sandford Lock to Abingdon LockCaution stream decreasing
Abingdon Lock to Culham LockCaution stream decreasing
Culham Lock to Clifton LockCaution strong stream
Clifton Lock to Day's LockCaution stream decreasing
Day's Lock to Benson LockCaution strong stream
Benson Lock to Cleeve LockCaution stream decreasing
Cleeve Lock to Goring LockCaution stream decreasing
Goring Lock to Whitchurch LockCaution stream decreasing
Whitchurch Lock to Mapledurham LockCaution stream decreasing
Mapledurham Lock to Caversham LockCaution stream decreasing
Upstream of Blake's LockCaution stream decreasing
Caversham Lock to Sonning LockCaution stream decreasing
Sonning Lock to Shiplake LockCaution stream decreasing
Shiplake Lock to Marsh LockCaution stream decreasing
Marsh Lock to Hambleden LockCaution stream decreasing

Henley to Teddington Back to Map

ReachCurrent conditions
Hambleden Lock to Hurley LockCaution stream decreasing
Hurley Lock to Temple LockCaution stream decreasing
Temple Lock to Marlow LockCaution strong stream
Marlow Lock to Cookham LockCaution strong stream
Cookham Lock to Boulters LockCaution stream decreasing
Boulters Lock to Bray LockCaution stream decreasing
Bray Lock to Boveney LockCaution stream decreasing
Boveney Lock to Romney LockCaution stream decreasing
Romney Lock to Old Windsor LockCaution strong stream
Old Windsor Lock to Bell Weir LockCaution stream decreasing
Bell Weir Lock to Penton Hook LockCaution stream decreasing
Penton Hook Lock to Chertsey LockCaution stream decreasing
Chertsey Lock to Shepperton LockCaution stream decreasing
Shepperton Lock to Sunbury LockNo Stream Warnings
Sunbury Lock to Molesey LockNo Stream Warnings
Molesey Lock to Teddington LockCaution stream increasing

Information for boaters

Coronavirus information

Please find the latest guidance for all boaters on Environment Agency managed waterways here: https://www.gov.uk/government/publications/environment-agency-waterways-coronavirus-covid-19-update.

Due to the on-going National lock down we are taking the following approach to operating all of our lock and weir sites on the River Thames with immediate effect;

  • There will be no assisted passage on the River Thames and all of our locks will remain on public power.
  • There will be no charge or time limit at any Environment Agency moorings.
  • We are unable to comment on what Local Authorities are doing at their moorings, this is a decision for them to make.
  • We will stop charging for pump outs.
  • We have extended the cleaning contract of our public toilets until the end of March so that they can remain open. Any sites that are not included in this contract, the public toilets will remain closed.
  • There will be no cash handling at any of our sites.

Teddington Lock also has special arrangements in place. You can find more detail on our River Thames restrictions and closures page.

If you need to use our pump-out facilities please email WaterwaysThames@environment-agency.gov.uk to make arrangements.

The levels of service will be reviewed regularly. Our staffing levels are currently reduced as a result of coronavirus.

Our services are restricted due to the impact of the coronavirus (COVID-19) emergency. Go to locks and facilities for boaters for more detail.

Service Updates

Shiplake Lock is now not navigable due to high water levels at the lock site.

Rushey Lock sewage pump-out is unavailable.

Mapledurham Lock sewage pump-out is unavailable.

Cookham Lock electric charging point at the short stay moorings is unavailable. The next electric charging points are downstream Old Windsor or upstream Shiplake. 

Navigation markers

When travelling upstream keep red obstruction marker buoys on your left, and green buoys on your right

When travelling downstream, keep red buoys on your right, and green buoys on your left.

Single yellow marker buoys can be passed on either side.

In all cases, pass well clear of marker buoys, and take care. You should also be careful in the margins of the river, and around bends, where river and weather conditions have resulted in tree debris collecting and some shallows forming.


Caution strong stream
We advise users of all boats not to navigate because the strong flows make it difficult and dangerous.
Caution stream increasing
We advise users of all unpowered boats not to navigate and users of powered boats to find a safe mooring. This is because river flows are likely to strengthen and red boards could be displayed very soon and without warning.
Caution stream decreasing
We advise users of all unpowered boats not to navigate and users of powered boats to navigate with caution.


This information is also available on Floodline. Call 0345 988 1188 and select option 1 for river information for boaters.


  • Contact Name: The Environment Agency

    Tel. 03708 506 506 (Monday to Friday, 8am to 5pm)

    E-mail: enquiries@environment-agency.gov.uk

  • Contact Name: Incident Hotline

    Tel. 0800 80 70 60 (24 hour service)

Related Links

Thames Locks MapThames Locks Map Names OverlayClick here to view current conditions for:
Lechlade to OxfordOxford to HenleyHenley to Teddington