At 12:15pm, Saturday 21st December GMT
Within the usual range for this location
Steady, no change from previous measurement at 12:00pm, Saturday 21st December GMT
River Thames from Calcutt to Lechlade including Hannington Wick
No current or recent warnings.
River Thames and its small tributaries from Calcutt to Lechlade
Recent warnings or alerts no longer in force
River Leach from just below Southrop to Mill Lane near Lechlade
No current or recent warnings.
River Leach from Northleach to Mill Lane near Lechlade
Recent warnings or alerts no longer in force
River Coln for Cotswold Water Park and Whelford
No current or recent warnings.
Darker blue shaded areas on long term data indicate maximum and minimum levels for the date (you may need to zoom in closer to see them).
Long term data may have gaps where the API data was not available.
Download long term data as csvNote: CSV data will include any outlying values that have been ignored by our graphing system as probably erroneous (eg, because they are ridiculously high compared to the values either side of them). It is your responsibility to filter these out if necessary.
Important! If you are planning to retrieve the csv data automatically, you must read and understand the limitations on the data and its availability.
Please note: Geographic coordinates may reflect the access point for the gauge, and not the precise location in the watercourse that it is taking readings from.
The usual range of the River Thames at St Johns Lock (Downstream) is between 1.38m and 2.13m. It has been between these levels for 90% of the time since monitoring began.
The typical recent level of the River Thames at St Johns Lock (Downstream) over the past 12 months has been between 1.48m and 2.75m. It has been between these levels for at least 150 days in the past year.
The highest level ever recorded at the River Thames at St Johns Lock (Downstream) is 3.00m, reached on Sunday 22nd July 2007 at 1:30pm.
Note that this data may not take account of recent measurements, as we wait until a level has been verified by the Environment Agency before adding it to our records.
Other monitoring locations on the River Thames
Ewen Somerford Keynes
Cricklade Hannington Bridge Buscot Lock Grafton Lock Radcot Lock Rushey Lock Shifford Lock Northmoor Lock Farmoor Pinkhill Lock Eynsham Lock Kings Lock
Godstow Lock Osney Lock Iffley Lock Sandford-on-Thames Abingdon Lock Culham Lock Sutton Courtenay Clifton Lock Days Lock Benson Lock Cleeve Lock Goring Lock Whitchurch Lock Mapledurham Lock Reading Caversham Lock Sonning Lock Shiplake Lock Marsh Lock Hurley Lock Marlow Lock Cookham Lock Boulters Lock Maidenhead Bray Lock Romney Lock Windsor Park Old Windsor Lock Bell Weir Staines Penton Hook Chertsey Lock Shepperton Lock Walton Sunbury Lock Molesey Lock Thames Ditton Island Kingston Trowlock Island Teddington LockMonitoring locations on nearby rivers