River Thames conditions - advice for boaters

Page Last Updated: 16 October 2019 15:51   

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 strong stream
St John's Lock to Buscot LockCaution strong stream
Buscot Lock to Grafton LockCaution strong stream
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 strong stream
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 strong stream

Oxford to Henley Back to Map

ReachCurrent conditions
Iffley Lock to Sandford LockCaution strong stream
Sandford Lock to Abingdon LockCaution strong stream
Abingdon Lock to Culham LockCaution strong stream
Culham Lock to Clifton LockCaution strong stream
Clifton Lock to Day's LockCaution strong stream
Day's Lock to Benson LockCaution stream increasing
Benson Lock to Cleeve LockCaution stream increasing
Cleeve Lock to Goring LockCaution stream increasing
Goring Lock to Whitchurch LockCaution strong stream
Whitchurch Lock to Mapledurham LockCaution strong stream
Mapledurham Lock to Caversham LockCaution stream increasing
Upstream of Blake's LockCaution stream increasing
Caversham Lock to Sonning LockCaution strong stream
Sonning Lock to Shiplake LockCaution strong stream
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 strong stream
Hurley Lock to Temple LockCaution strong stream
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 increasing
Bray Lock to Boveney LockCaution strong stream
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 LockCaution stream increasing
Penton Hook Lock to Chertsey LockCaution stream increasing
Chertsey Lock to Shepperton LockCaution stream increasing
Shepperton Lock to Sunbury LockCaution stream increasing
Sunbury Lock to Molesey LockNo Stream Warnings
Molesey Lock to Teddington LockNo Stream Warnings

Information for boaters

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 

Report of fallen tree

A fallen tree has been reported on the east side of Poplar Eyot between Marsh and Shiplake Locks.  Please navigate on the west side of Poplar Eyot whilst we arrange for the fallen tree to be removed.

Navigation marks on shoals and underwater 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.

Service update

Benson lock electric charging point is unavailable.

Mapledurham lock pump out is unavailable.

Annual registration

If you keep your boat anywhere on the non-tidal Thames (including in marinas) you need to register your boat and pay the annual charge or risk being prosecuted for non-compliance and getting a criminal conviction. Most boat owners pay for their registration on time.

Contact the boat registration team on 03708 506 506.

Speed limit

The speed limit for all powered vessels on the non-tidal Thames is 8kph or 4.3kts or 5mph. Do not create wash whatever speed you are navigating at


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