River Thames conditions - advice for boaters

Page Last Updated: 22 March 2018 00:14   

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. You can also sign up to our RSS service if you would like to receive updates.

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 strong stream
Rushey Lock to Shifford LockCaution strong stream
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 stream decreasing
Godstow Lock to Osney LockCaution strong stream
Osney Lock to Iffley LockCaution strong stream

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 stream decreasing
Benson Lock to Cleeve LockCaution stream decreasing
Cleeve Lock to Goring LockCaution stream decreasing
Goring Lock to Whitchurch LockCaution strong stream
Whitchurch Lock to Mapledurham LockCaution stream decreasing
Mapledurham Lock to Caversham LockCaution stream decreasing
Upstream of Blake's LockCaution stream increasing
Caversham Lock to Sonning LockCaution strong stream
Sonning Lock to Shiplake LockCaution stream increasing
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 stream decreasing
Cookham Lock to Boulters LockCaution stream increasing
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 stream decreasing
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 LockCaution stream decreasing
Sunbury Lock to Molesey LockNo Stream Warnings
Molesey Lock to Teddington LockNo Stream Warnings

Information for boaters

River conditions

River flows are sensitive to rainfall and snow melt in winter and can respond quickly. For water levels go to https://flood-warning-information.service.gov.uk/river-and-sea-levels For flow rates go to http://www.gaugemap.co.uk

Navigation marks on shoals and obstructions

When navigating upstream, leave red buoys to the left and green buoys to the right. When navigating downstream remember that the opposite rule applies. Avoid yellow and orange buoys as they mark hazards. For further advice, ask the local duty Lock Keeper.

Annual registration 2018

If you keep your boat anywhere on the non-tidal Thames (including in marinas) you need to register your boat and pay the annual fee or risk being prosecuted for non-compliance. Contact the boat registration team on 03708 506 506

Hambleden Lock, Weir Walkway

The walkway is undergoing repair between 05/03/2018 - 09/04/2018, the footpath will be open for public use however there will be a temporary diversion in place during this period. The works will not affect navigation.

Teddington Barge Lock

Head gates removed but still operational using the middle gates. Launch lock operational as usual.

Suspension of River Thames conditions email updates

Due to technical issues we are unable to notify subscribers of any changes on this web page. Remember to refresh the page each time you log in so that you see the most up to date information.



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.


Related Links

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