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Boulters Lock water level

River gauge, River Thames, Berkshire, United Kingdom

Directions

Right now

Low for mid-October

Water level

0.15m Steady over the last 24 hours

0.0 0.5 1.0 Highest onrecord 1.13 m Lowest on record -0.22 m

History

History
-0.00.10.20.3mOct 16Oct 16Oct 17Oct 18Oct 18Top of normal rangeBottom of normal range-0.00.10.20.3mOct 16Oct 17Oct 18Top of normal rangeBottom of normal range
-0.00.10.20.3mOct 2025Jan 2026Apr 2026Jul 2026Oct 2026Top of normal rangeBottom of normal range-0.00.10.20.3mOct 2025Apr 2026Oct 2026Top of normal rangeBottom of normal range
0.10.20.3mJanMarMayJulSepNov20260.10.20.3mJanAprJulOct2026

20252026

Water level Normal range (10–90 %) Top of normal rangeBottom of normal range

What this means

The River Thames at Boulters Lock is running below normal at 0.15 m.

That puts it 0.03 m below the median of 0.18 m for mid-October, based on 21 years of readings. A year ago it stood at 0.15 m as well.

The level has held steady over the past 24 hours. Without real rain upstream, that is unlikely to change quickly. In the last month it has stayed between 0.06 m and 0.17 m.

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

Compared with 21 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date
0.18 m0.03 m below the median for this date
Normal for this date
0.12 m – 0.25 m8 years in 10 fall in this range (21 years of records)
Normal range
0.00 m – 0.30 m
Same day last year
0.15 m0.00 m
Lowest and highest in 30 days
0.06 m – 0.17 m
Lowest and highest in 12 months
0.07 m – 0.34 m
Highest on record
1.13 mDecember 12, 2000
Lowest on record
−0.22 mSeptember 6, 1999

Fishing and paddling

At low levels, many rivers become a walk-and-paddle trip. Fish hold in deeper pools and spook easily.

Flood alerts and warnings come from the Environment Agency.

About the River Thames

River Thames

The River Thames, or simply the Thames, known alternatively in parts as the River Isis, is a river that flows through southern England including London. At 215 miles (346 km), it is the longest river entirely in England and the second-longest in the United Kingdom, after the River Severn.

Read more on Wikipedia

Text and image from Wikipedia and Wikimedia Commons, licensed under CC BY-SA.

Weather at the gauge

Rain in the last 3 days: 2.3 mm. Rain that falls upstream can take hours or days to show up at a river gauge.

18 Sun 13° 7° 0.2 mm, 91% Wind 21 km/h
19 Mon 14° 9° 2.1 mm, 90% Wind 16 km/h
20 Tue 13° 11° 13 mm, 76% Wind 11 km/h
21 Wed 12° 6° 12 mm, 53% Wind 28 km/h
22 Thu 12° 4° 0.9 mm, 71% Wind 14 km/h
23 Fri 13° 7° 26 mm, 85% Wind 40 km/h
24 Sat 13° 6° 2.8 mm, 45% Wind 25 km/h

Forecast: Open-Meteo

Sunrise 07:32 AM Sunset 06:05 PM Daylight 10 hr, 33 min First quarter 51%

Map

Other gauges on the River Thames

Gauge Level Compared with normal 24 hours Distance
MaidenheadRiver gauge, River Thames 2.21 m Very low ±0 1.0 km
Bray LockRiver gauge, River Thames 0.17 m Very low +0.01 m 2.7 km
Cookham LockRiver gauge, River Thames 0.09 m Normal +0.01 m 3.2 km
Boveney LockRiver gauge, River Thames 0.19 m Normal +0.01 m 6.2 km
Marlow LockRiver gauge, River Thames 0.07 m Low +0.01 m 6.2 km
Temple LockRiver gauge, River Thames 0.03 m Low ±0 6.9 km
Hurley LockRiver gauge, River Thames 0.05 m Low ±0 7.8 km
Romney LockRiver gauge, River Thames 0.26 m Very high +0.01 m 8.0 km
Windsor ParkRiver gauge, River Thames 3.31 m Normal +0.01 m 9.2 km
Old Windsor LockRiver gauge, River Thames 0.26 m Very high +0.03 m 12 km
Hambleden LockRiver gauge, River Thames 0.09 m Normal ±0 12 km
Marsh LockRiver gauge, River Thames 0.24 m Normal ±0 13 km

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
TaplowRiver gauge, Jubilee River 1.64 m Normal +0.01 m 0.4 km
Raymill RoadRiver gauge, Maidenhead Ditch −0.02 m Lowest on record +0.01 m 1.3 km
The BinghamsRiver gauge, The Cut 0.94 m Normal −0.01 m 3.0 km
BrayGroundwater well 17.26 m Low +0.02 m 3.8 km
Bourne EndRiver gauge, River Wye 0.17 m Normal +0.01 m 4.3 km

Questions and answers

How does the River Thames at Boulters Lock compare with last year?

It is about the same as on this day last year, when the reading was 0.15 m.

What is a normal level for the River Thames at Boulters Lock in mid-October?

The median for mid-October is 0.18 m. In 8 years out of 10 the reading falls between 0.12 m and 0.25 m, based on 21 years of records.

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 0.15 m on the gauge does not mean the water is that deep.

What is the water level of Boulters Lock today?

On 18 Oct 2026, 18:45 BST, the water level was 0.15 m. Steady over the last 24 hours.

Is Boulters Lock rising or falling?

Steady over the last 24 hours.

Is the level of Boulters Lock normal?

Low for mid-October. Compared with 21 years of daily readings for this time of year.

What is the highest water level ever recorded at Boulters Lock?

The highest level on record is 1.13 m on December 12, 2000. The lowest is −0.22 m on September 6, 1999.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
Environment Agency
Station code
ea:2602TH (Agency page)
Coordinates
51.53271, -0.69947 (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

ParameterLast valueTime (UTC)Quality
Water level 0.15 m 2026-10-18 17:45 Provisional

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How to cite

Environment Agency: Boulters Lock (ea:2602TH). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-kingdom/berkshire/boulters-lock

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.