Jubilee River at Chalvey Ditch A355 Siphon water level

Name: Jubilee River at Chalvey Ditch A355 Siphon water level (Environment Agency)
Creator: Environment Agency
License: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/

River gauge, Berkshire, United Kingdom

Directions

Latest reading

Surface elevation

17.27m Up 0.07 m over the last 24 hours

Measured 20 Oct 2026, 20:30 BST (41 min ago)

History

7 days 30 days

Surface elevation

What this means

The latest river level reported for Jubilee River at Chalvey Ditch A355 Siphon is 17.27 m. The agency publishes no normal range or warning level for this river yet, so there is nothing to judge the number against.

The water is rising: up 0.07 m over the past 24 hours. Over the past 30 days it has moved between 17.19 m and 17.29 m.

Over the past seven days the change adds up to +0.08 m.

The agency publishes no normal range for this gauge yet, so we show the trend only. How to read levels

Key numbers

Lowest and highest in 30 days: 17.19 m – 17.29 m
Lowest and highest in 12 months: 17.19 m – 17.21 m

On the river at Jubilee River at Chalvey Ditch A355 Siphon

There is no published typical range for this gauge yet, so anglers and canoeists are best guided by the trend.

Flood warnings for the area come from the Environment Agency.

Weather at the gauge

Rain in the last 3 days: 2.5 mm. Rain that falls upstream can take hours or days to show up at a river gauge.

18 Sun 14° 8° 2.4 mm, 83% Wind 21 km/h

19 Mon 15° 10° 0.8 mm, 81% Wind 16 km/h

20 Tue 13° 11° 11 mm, 63% Wind 8 km/h

21 Wed 14° 8° 3.3 mm, 44% Wind 25 km/h

22 Thu 14° 6° 2.0 mm, 53% Wind 14 km/h

23 Fri 11° 8° 38 mm, 78% Wind 32 km/h

24 Sat 10° 4° – Wind 22 km/h

Forecast: Open-Meteo

Sunrise 07:35 AM Sunset 06:01 PM Daylight 10 hr, 26 min Waxing gibbous 71%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Romney LockRiver gauge, River Thames	0.28 m	Very high	+0.03 m	1.5 km
Boveney LockRiver gauge, River Thames	0.24 m	Normal	+0.04 m	2.0 km
Windsor ParkRiver gauge, River Thames	3.35 m	Normal	+0.04 m	2.7 km
BrayGroundwater well	17.26 m	Low	+0.02 m	4.7 km
Bray LockRiver gauge, River Thames	0.24 m	Normal	+0.08 m	5.1 km
Old Windsor LockRiver gauge, River Thames	0.28 m	Very high	+0.03 m	5.5 km
TaplowRiver gauge, Jubilee River	1.69 m	Normal	+0.05 m	6.3 km
MaidenheadRiver gauge, River Thames	2.28 m	Low	+0.08 m	6.3 km

Questions and answers

Is Jubilee River at Chalvey Ditch A355 Siphon really 17.27 m deep?

No. 17.27 m is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.

What is the water level of Jubilee River at Chalvey Ditch A355 Siphon today?

On 20 Oct 2026, 20:30 BST, the surface elevation was 17.27 m. Up 0.07 m over the last 24 hours.

Is Jubilee River at Chalvey Ditch A355 Siphon rising or falling?

Up 0.07 m over the last 24 hours. Up 0.08 m over the last 7 days.

Is the level of Jubilee River at Chalvey Ditch A355 Siphon normal?

The agency publishes no normal range for this gauge yet, so we show the trend only.

How often is this data updated?

The Environment Agency publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

Where does this data come from?

The values come directly from the Environment Agency, the official operator of this gauge, and are published under the Open Government Licence v3.0. We do not estimate or model live values.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: Environment Agency
Station code: ea:2733TH
Coordinates: 51.50227, -0.61765 (WGS84)
Vertical datum: ODN
Update interval: every 15 minutes
Licence: Open Government Licence v3.0. Contains Environment Agency data licensed under the Open Government Licence v3.0

Published series

Parameter	Last value	Time (UTC)	Quality
Surface elevation	17.27 m	2026-10-20 19:30	Provisional

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How to cite

Environment Agency: Jubilee River at Chalvey Ditch A355 Siphon (ea:2733TH). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-kingdom/berkshire/jubilee-river-at-chalvey-ditch-a355-siphon

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer