Latest river level information for:
the Thames at Sunbury Lock (downstream data)

4:29pm Wednesday 24 May 2017

Latest level 2.51m

Normal range is 2.29m to 3.34m

Recorded at 4:00pm Wednesday 24 May 2017

View upstream data for this station

Why are there 2 sets of data for this station?

Some monitoring stations are located near to a man-made structure which affects the river's flow characteristics, for example a weir, or lock. For these stations, we provide river levels from both the upstream and downstream sides of the structure.

River levels at this location in the last 5 days

Flooding is possible over 3.34m

What's the highest recorded level here?

Highest recorded level 5.05m on 11 February 2014

This is the highest water level recorded here since the station was opened.

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DateTime	Value	Error
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1495357200000	0.15	false
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1495353600000	2.43	false
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1495351800000	2.4	false
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1495350000000	2.39	false
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1495251000000	2.6	false
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Other measuring stations in this area

• Monitoring station
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• Monitoring station unavailable
• Location of the place you entered

Zoom into the map and select a river or sea level station to see more information.

Key information

• Station name: Sunbury Lock (downstream)
• Station ID: 7245
• River name: Thames
• Typical range: 2.29m to 3.34m
• Highest level on record: 5.05m on 11 February 2014
• Site datum: 3.94mAOD (what does this mean?)

How are river levels measured?

The Environment agency uses a network of monitoring stations across the country. Each one has its own datum - a height in metres fixed relative to mean sea level. This height is expressed as metres above ordnance datum (mAOD). The river levels we provide for each monitoring station are all relative to its site datum.

If we didn't do this, we'd show some very high measurements, which could cause confusion. By using a local site datum, the river levels are easier to understand, especially by users familiar with the data from a particular monitoring station.

A river's height above ordnance datum can be seen by adding the site datum to the river level.

How often are river and sea levels measured?

The data we collect is fed into this service once or twice a day under typical conditions. We increase this frequency whenever there's a greater risk of flooding.

How might river levels affect flood risk?

Typical range

This is the usual range of river levels at this station, based on historical data.

Above typical

This means that flooding is possible because river levels at this station are currently higher than usual.
Many factors can influence the possibility of flooding - river levels are only one indicator. Always check if there's a flood warning in place at a particular location.

Below typical

This means that river levels at this station are currently lower than usual.
Drought or water management measures may be in place. Please check for the latest information on water resources and restrictions in your area.

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