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Marsh Lock water level

River gauge, River Thames, Oxfordshire, United Kingdom

Directions

Right now

Normal for mid-October

Water level

0.23m Steady over the last 24 hours

0 1 Highest onrecord 1.63 m Lowest on record -0.45 m

History

History
0.10.20.30.4mOct 16Oct 16Oct 17Oct 17Oct 18Top of normal rangeBottom of normal range0.10.20.30.4mOct 16Oct 17Oct 18Top of normal rangeBottom of normal range
0.20.40.60.8mOct 2025Jan 2026Apr 2026Jul 2026Oct 2026Top of normal rangeBottom of normal range0.20.40.60.8mOct 2025Apr 2026Oct 2026Top of normal rangeBottom of normal range
0.20.40.6mJanMarMayJulSepNov20260.20.40.6mJanAprJulOct2026

20252026

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

What this means

Water levels are unremarkable at Marsh Lock, where the gauge shows 0.23 m.

The median for mid-October is 0.22 m, based on 21 years of readings, so the river level is 0.01 m above typical. A year ago it stood at 0.23 m as well.

It has barely moved over the past 24 hours. The 30-day range is 0.22 m – 0.24 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
0.22 m0.01 m above the median for this date
Normal for this date
0.16 m – 0.27 m8 years in 10 fall in this range (21 years of records)
Normal range
0.11 m – 0.40 m
Same day last year
0.23 m0.00 m
Lowest and highest in 30 days
0.22 m – 0.24 m
Lowest and highest in 12 months
0.14 m – 0.68 m
Highest on record
1.63 mNovember 1, 2001
Lowest on record
−0.45 mNovember 7, 1997

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.

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: 1.8 mm. Rain that falls upstream can take hours or days to show up at a river gauge.

18 Sun 13° 7° 0.9 mm, 74% Wind 21 km/h
19 Mon 15° 9° 2.1 mm, 90% Wind 17 km/h
20 Tue 13° 10° 12 mm, 67% Wind 9 km/h
21 Wed 14° 7° 4.8 mm, 44% Wind 26 km/h
22 Thu 14° 5° 0.8 mm, 61% Wind 16 km/h
23 Fri 10° 7° 36 mm, 77% Wind 33 km/h
24 Sat 10° 3° – Wind 25 km/h

Forecast: Open-Meteo

Sunrise 07:33 AM Sunset 06:06 PM Daylight 10 hr, 33 min First quarter 45%

Map

Other gauges on the River Thames

Gauge Level Compared with normal 24 hours Distance
Shiplake LockRiver gauge, River Thames 0.04 m Low +0.01 m 3.1 km
Hambleden LockRiver gauge, River Thames 0.09 m Normal ±0 3.6 km
Hurley LockRiver gauge, River Thames 0.05 m Low ±0 5.9 km
Sonning LockRiver gauge, River Thames 0.24 m Very high ±0 6.6 km
Temple LockRiver gauge, River Thames 0.03 m Low ±0 6.9 km
Marlow LockRiver gauge, River Thames 0.07 m Low ±0 9.1 km
Caversham LockRiver gauge, River Thames 0.14 m Low +0.01 m 9.3 km
ReadingRiver gauge, River Thames 6.69 m Normal +0.01 m 9.4 km
Mapledurham LockRiver gauge, River Thames 0.07 m Normal +0.01 m 12 km
MaidenheadRiver gauge, River Thames 2.21 m Very low +0.01 m 13 km
Boulters LockRiver gauge, River Thames 0.14 m Low ±0 13 km
Cookham LockRiver gauge, River Thames 0.08 m Normal ±0 14 km

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
TwyfordRiver gauge, River Loddon 0.99 m Normal +0.02 m 4.9 km
Stonor EstateGroundwater well 72.36 m Normal −0.07 m 8.3 km
Blakes LockRiver gauge, River Kennet 0.06 m Low ±0 9.4 km

Questions and answers

Is the River Thames at Marsh Lock higher than last year?

It is about the same as on this day last year, when the reading was 0.23 m.

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

The median for mid-October is 0.22 m. In 8 years out of 10 the reading falls between 0.16 m and 0.27 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 0.23 m on the gauge does not mean the water is that deep.

What is the water level of Marsh Lock today?

On 18 Oct 2026, 03:15 BST, the water level was 0.23 m. Steady over the last 24 hours.

Is Marsh Lock rising or falling?

Steady over the last 24 hours.

Is the level of Marsh Lock normal?

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

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

The highest level on record is 1.63 m on November 1, 2001. The lowest is −0.45 m on November 7, 1997.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
Environment Agency
Station code
ea:2495TH (Agency page)
Coordinates
51.52878, -0.88570 (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 0.23 m 2026-10-18 02:15 Provisional

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How to cite

Environment Agency: Marsh Lock (ea:2495TH). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-kingdom/oxfordshire/marsh-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.