River Levels
River Levels

River Thames at St Johns Lock (Downstream)

Current River Level


At 5:45pm, Tuesday 3rd October BST
(4:45pm, Tuesday 3rd October GMT)

Within the usual range for this location

Falling, -0.010 from previous measurement at 4:45pm, Tuesday 3rd October BST

View upstream gauge levels

Flood Warning Areas Covering Here

River Thames from Calcutt to Lechlade including Hannington Wick

No current or recent warnings.

River Thames and its small tributaries from Calcutt to Lechlade

No current or recent warnings.

Other Nearby Flood Warning Areas

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

No current or recent warnings.

River Coln for Cotswold Water Park and Whelford

No current or recent warnings.

Seven Day Level Chart

Long Term Level Chart

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 csv

Note: 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.

Location and Technical Data

  • Monitoring Station: St Johns Lock
  • Watercourse: Thames
  • Nearest Town/Village: Lechlade
  • Local Authority: Cotswold
  • Ceremonial County: Gloucestershire
  • Coordinates: 51°41'21"N 1°40'43"W (51.68931,-1.678796)
  • OS Grid: SU223990 (422300,199000)
  • Mapcode (Local): GBR 5VC.2D9
  • Mapcode (Global): VHC0B.VSBV
  • Open Location Code: 9C3WM8QC+PF
  • Maidenhead Locator System: IO91dq85
  • Environment Agency Location ID: 0701TH
  • Environment Agency Gauge ID: 0701TH-level-downstage-i-15_min-mASD
  • Operational Area: Upper Thames
  • Catchment Area: Gloucestershire and the Vale
  • UK Hydrometric Area: Thames
  • Environment Agency Region: Thames
  • Datum Type: Above Stage Datum (ASD)
  • Stage Datum: 68.942m AOD

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 2.04m. 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 1.37m and 2.73m. 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.

Nearby Monitoring Locations

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