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St Johns Lock water level

River gauge, River Thames, Gloucestershire, United Kingdom

Directions

Right now

Normal for mid-October

Water level

0.07m Down 0.02 m over the last 24 hours

0.0 0.5 1.0 Highest onrecord 0.95 m Lowest on record -0.27 m

History

History
-0.00.10.2mOct 16Oct 16Oct 17Oct 18Oct 18Top of normal rangeBottom of normal range-0.00.10.2mOct 16Oct 17Oct 18Top of normal rangeBottom of normal range
-0.00.20.4mOct 2025Jan 2026Apr 2026Jul 2026Oct 2026Top of normal rangeBottom of normal range-0.00.20.4mOct 2025Apr 2026Oct 2026Top of normal rangeBottom of normal range
-0.00.20.4mJanMarMayJulSepNov2026-0.00.20.4mJanAprJulOct2026

20252026

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

What this means

The gauge at St Johns Lock reads 0.07 m, a normal level for mid-October.

The median for mid-October is 0.09 m, based on 21 years of readings, so the river level is 0.03 m below typical. On the same day last year the reading was 0.11 m, a difference of −0.04 m.

The level is falling, down 0.02 m over the past 24 hours. Over the past 30 days it has moved between 0.06 m and 0.09 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
0.09 m0.03 m below the median for this date
Normal for this date
0.02 m – 0.22 m8 years in 10 fall in this range (21 years of records)
Normal range
−0.01 m – 0.25 m
Same day last year
0.11 m−0.04 m
Lowest and highest in 30 days
0.06 m – 0.09 m
Lowest and highest in 12 months
0.03 m – 0.49 m
Highest on record
0.95 mNovember 23, 1995
Lowest on record
−0.27 mMarch 20, 2008

On the river at St Johns Lock

A level in the typical range is usually good news for both anglers and canoeists, but conditions can change quickly after rain in the hills.

Flood warnings for the area 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: 1.4 mm. Rain that falls upstream can take hours or days to show up at a river gauge.

18 Sun 12° 7° 0.1 mm, 38% Wind 22 km/h
19 Mon 14° 8° 5.0 mm, 100% Wind 23 km/h
20 Tue 12° 9° 3.6 mm, 89% Wind 10 km/h
21 Wed 11° 4° 12 mm, 55% Wind 32 km/h
22 Thu 12° 5° 2.2 mm, 76% Wind 19 km/h
23 Fri 12° 7° 28 mm, 80% Wind 44 km/h
24 Sat 13° 5° – Wind 25 km/h

Forecast: Open-Meteo

Sunrise 07:36 AM Sunset 06:09 PM Daylight 10 hr, 33 min First quarter 51%

Map

Other gauges on the River Thames

Gauge Level Compared with normal 24 hours Distance
Buscot LockRiver gauge, River Thames 0.14 m Normal −0.03 m 1.1 km
Grafton LockRiver gauge, River Thames 0.17 m Normal −0.01 m 4.9 km
Hannington BridgeRiver gauge, River Thames 1.97 m Very low −0.05 m 5.7 km
Radcot LockRiver gauge, River Thames 0.14 m Normal ±0 7.4 km
Rushey LockRiver gauge, River Thames 0.13 m Normal ±0 10 km
CrickladeRiver gauge, River Thames 0.04 m Very low ±0 14 km
Shifford LockRiver gauge, River Thames 0.15 m Normal ±0 15 km
Somerford KeynesRiver gauge, River Thames 0.44 m Low ±0 21 km
Northmoor LockRiver gauge, River Thames 0.12 m Normal ±0 21 km
EwenRiver gauge, River Thames −0.02 m Normal ±0 22 km
FarmoorRiver gauge, River Thames 0.76 m Very low +0.01 m 23 km
Pinkhill LockRiver gauge, River Thames 0.01 m Very low +0.01 m 23 km

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
LechladeRiver gauge, River Leach 0.05 m Low ±0 0.6 km
IngleshamRiver gauge, River Cole 0.06 m Low −0.02 m 2.5 km
ClanfieldRiver gauge, Clanfield Brook 0.68 m High ±0 7.0 km
FairfordRiver gauge, River Coln 0.41 m Low −0.01 m 7.6 km
BamptonRiver gauge, Shill Brook 0.89 m Low ±0 9.8 km
Whetstone BridgeRiver gauge, Marston Meysey Brook 0.08 m Normal ±0 9.8 km

Questions and answers

Is the River Thames at St Johns Lock higher than last year?

No, it is 0.04 m lower than on the same day last year, when the reading was 0.11 m.

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

The median for mid-October is 0.09 m. In 8 years out of 10 the reading falls between 0.02 m and 0.22 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 0.07 m on the gauge does not mean the water is that deep.

What is the water level of St Johns Lock today?

On 18 Oct 2026, 17:00 BST, the water level was 0.07 m. Down 0.02 m over the last 24 hours.

Is St Johns Lock rising or falling?

Down 0.02 m over the last 24 hours.

Is the level of St Johns 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 St Johns Lock?

The highest level on record is 0.95 m on November 23, 1995. The lowest is −0.27 m on March 20, 2008.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
Environment Agency
Station code
ea:0701TH (Agency page)
Coordinates
51.68931, -1.67880 (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 0.07 m 2026-10-18 16:00 Provisional

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How to cite

Environment Agency: St Johns Lock (ea:0701TH). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-kingdom/gloucestershire/st-johns-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.