Tumbling Bay Weir water level

Name: Tumbling Bay Weir water level (Environment Agency)
Creator: Environment Agency
License: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/

River gauge, Amwell Loop, Hertfordshire, United Kingdom

Directions

Within the normal range

Water level

30.37m Down 0.05 m over the last 24 hours

Measured 20 Oct 2026, 10:15 BST (31 min ago)

History

7 days 30 days

Water level Top of normal rangeBottom of normal range

What this means

Water levels are unremarkable at Tumbling Bay Weir, where the gauge shows 30.37 m.

The usual range here runs from 30.29 m to 30.73 m.

It is still going down, by 0.05 m over the past 24 hours. The 30-day range is 30.37 m – 30.49 m.

Autumn rain usually starts to lift rivers again after the summer low.

Compared with the normal range the agency publishes for this gauge. How to read levels

Key numbers

Normal range: 30.29 m – 30.73 m
Lowest and highest in 30 days: 30.37 m – 30.49 m
Lowest and highest in 12 months: 30.38 m – 30.46 m
Highest on record: 31.61 mMay 9, 2023
Lowest on record: 30.13 mSeptember 18, 2019

For anglers and canoeists

This is an ordinary level for the river: most put-ins, beats and weirs behave as they usually do.

Many angling and canoe clubs check gauges like this one before heading out.

Weather at the gauge

Rain in the last 3 days: 3.7 mm. Rain that falls upstream can take hours or days to show up at a river gauge.

19 Mon 13° 9° 1.1 mm, 97% Wind 15 km/h

20 Tue 12° 11° 3.3 mm, 80% Wind 17 km/h

21 Wed 12° 7° 5.6 mm, 49% Wind 38 km/h

22 Thu 11° 6° 2.9 mm, 62% Wind 23 km/h

23 Fri 12° 6° 19 mm, 81% Wind 48 km/h

24 Sat 11° 5° 6.1 mm, 62% Wind 32 km/h

25 Sun 18° 10° 3.2 mm, 51% Wind 35 km/h

Forecast: Open-Meteo

Sunrise 07:33 AM Sunset 05:58 PM Daylight 10 hr, 25 min First quarter 67%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
MardockRiver gauge, River Ash	0.10 m	Normal	±0	3.0 km
WadesmillRiver gauge, River Rib	0.19 m	Normal	±0	3.3 km
Hertford, Hartham ParkRiver gauge, River Beane	0.18 m	Normal	−0.04 m	4.0 km
Hoddesdon, Rye BridgeRiver gauge, River Lee	2.85 m	Normal	±0	4.8 km
Roydon, Glen FabaRiver gauge, River Stort	1.44 m	Normal	±0	5.6 km
WaterhallRiver gauge, River Lee	0.12 m	Low	±0	7.6 km
Harlow, Elizabeth WayRiver gauge, Canons Brook	0.05 m	Normal	−0.01 m	7.7 km
Dane EndRiver gauge, River Beane	1.04 m	Very high	+0.14 m	7.8 km

Questions and answers

What is the typical range for the Amwell Loop at Tumbling Bay Weir?

The Environment Agency gives a typical range of 30.29 m to 30.73 m for this gauge.

Is the river level the same as the depth of the water?

No. The reading is measured from a fixed zero mark at the gauge, so 30.37 m on the gauge does not mean the water is that deep.

What is the water level of Tumbling Bay Weir today?

On 20 Oct 2026, 10:15 BST, the water level was 30.37 m. Down 0.05 m over the last 24 hours.

Is Tumbling Bay Weir rising or falling?

Down 0.05 m over the last 24 hours. Down 0.02 m over the last 7 days.

Is the level of Tumbling Bay Weir normal?

Within the normal range. Compared with the normal range the agency publishes for this gauge.

What is the highest water level ever recorded at Tumbling Bay Weir?

The highest level on record is 31.61 m on May 9, 2023. The lowest is 30.13 m on September 18, 2019.

How often is this data updated?

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

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: Environment Agency
Station code: ea:5263TH (Agency page)
Coordinates: 51.80912, -0.02304 (WGS84)
Vertical datum: station datum
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
Water level	30.37 m	2026-10-20 09:15	Provisional

Download

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How to cite

Environment Agency: Tumbling Bay Weir (ea:5263TH). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-kingdom/hertfordshire/tumbling-bay-weir

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