River Thames conditions - advice for boaters

Page Last Updated: 7 August 2020 12:36   

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 LockNo Stream Warnings
St John's Lock to Buscot LockNo Stream Warnings
Buscot Lock to Grafton LockNo Stream Warnings
Grafton Lock to Radcot LockNo Stream Warnings
Radcot Lock to Rushey LockNo Stream Warnings
Rushey Lock to Shifford LockNo Stream Warnings
Shifford Lock to Northmoor LockNo Stream Warnings
Northmoor Lock to Pinkhill LockNo Stream Warnings
Pinkhill Lock to Eynsham LockNo Stream Warnings
Eynsham Lock to King's LockNo Stream Warnings
King's Lock to Godstow LockNo Stream Warnings
Godstow Lock to Osney LockNo Stream Warnings
Osney Lock to Iffley LockNo Stream Warnings

Oxford to Henley Back to Map

ReachCurrent conditions
Iffley Lock to Sandford LockNo Stream Warnings
Sandford Lock to Abingdon LockNo Stream Warnings
Abingdon Lock to Culham LockNo Stream Warnings
Culham Lock to Clifton LockNo Stream Warnings
Clifton Lock to Day's LockNo Stream Warnings
Day's Lock to Benson LockNo Stream Warnings
Benson Lock to Cleeve LockNo Stream Warnings
Cleeve Lock to Goring LockNo Stream Warnings
Goring Lock to Whitchurch LockNo Stream Warnings
Whitchurch Lock to Mapledurham LockNo Stream Warnings
Mapledurham Lock to Caversham LockNo Stream Warnings
Upstream of Blake's LockNo Stream Warnings
Caversham Lock to Sonning LockNo Stream Warnings
Sonning Lock to Shiplake LockNo Stream Warnings
Shiplake Lock to Marsh LockNo Stream Warnings
Marsh Lock to Hambleden LockNo Stream Warnings

Henley to Teddington Back to Map

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

Information for boaters

All planned or ongoing river restrictions and closures can be found on GOV.UK: https://www.gov.uk/guidance/river-thames-restrictions-and-closures.

Some of our other services are restricted. Go to GOV.UK for more detail.

Coronavirus information and guidance for all Environment Agency waterways can also be found on GOV.UK: https://www.gov.uk/government/publications/environment-agency-waterways-coronavirus-covid-19-update


Subject to staff availability assisted passage is now offered at all locks except Boulters Lock in Maidenhead. We are working to reintroduce assisted passage at this last remaining site as soon as we can.

Special arrangements are in place at Teddington, as outlined here: https://www.gov.uk/guidance/river-thames-restrictions-and-closures.

The levels of service offered reflect our staffing levels which are currently reduced as result of coronavirus (COVID-19). The service levels offered will vary from site to site each day according to staff availability. They are:

Basic service

The duty lock and weir keeper may be working at more than one site. Assisted passage cannot therefore be guaranteed but may be offered during published duty hours. When not offered, ‘self-service’ signs will be displayed.

Standard service

Assisted passage is offered for published duty hours, though staff breaks, weir work and maintenance periods may not be covered.

Lock and weir keeper duty hours are:

  • July and August: 9am to 6:30pm

  • May, June and September: 9am to 6pm

  • April and October: 9am to 5pm

  • November to March: 9:15am to 4pm

Please note: Hurley Lock is on hand wind operation only until Wednesday 12 August. The public power system has a fault which requires a spcialist part to fix, which is on order. Please consider the extra effort and time it may take to use the lock when planning your journey. We apologise for any inconvenience caused.


Service update

If you need to use our sewage pump-out or electric charging facilities, please email WaterwaysThames@environment-agency.gov.uk. You should provide a contact phone number and tell us which pump-out or electric charging point you need to use. A member of the team will call you to discuss arrangements for using the facility.

Rushey Lock sewage pump-out is unavailable.

Benson Lock electric charging point is unavailable.

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.

Water levels and flow rates

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


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