St Marys water level

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

Tidal gauge, Cornwall, United Kingdom

Directions

Latest reading

Water level

2.64m Up 0.35 m over the last 24 hours

Measured 17 Oct 2026, 13:15 BST (44 min ago)

History

7 days 30 days

Water level

What this means

The latest water level reported for St Marys is 2.64 m. There is no published reference for this tidal gauge yet, so we can't say whether that is high or low for the season.

The water is rising: up 0.35 m over the past 24 hours. Over the past 30 days it has moved between 0.75 m and 6.15 m.

Over the past seven days the change adds up to +1.12 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: 0.75 m – 6.15 m

Weather at the gauge

The forecast is not available right now.

Sunrise 07:50 AM Sunset 06:32 PM Daylight 10 hr, 42 min First quarter 40%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
St MarysTidal gauge	−0.27 m	No reference yet	+0.35 m	0.0 km
PenberthRiver gauge, Penberth Stream	0.19 m	Very low	−0.03 m	51 km
Newlyn CoombeRiver gauge, Newlyn Coombe River	0.10 m	Lowest on record	−0.01 m	59 km
Penzance AlvertonRiver gauge, Lariggan River	0.07 m	Very low	±0	59 km
NewlynTidal gauge	−0.23 m	No reference yet	+0.30 m	59 km
NewlynTidal gauge	2.82 m	No reference yet	+0.30 m	59 km
St Ives Consols FarmRiver gauge, River Stennack	0.06 m	Very low	±0	67 km
St ErthRiver gauge, River Hayle	0.18 m	Very low	−0.02 m	69 km

Questions and answers

What is the water level of St Marys today?

On 17 Oct 2026, 13:15 BST, the water level was 2.64 m. Up 0.35 m over the last 24 hours.

Is St Marys rising or falling?

Up 0.35 m over the last 24 hours. Up 1.12 m over the last 7 days.

Is the level of St Marys 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:E72324
Coordinates: 49.91786, -6.31722 (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	2.64 m	2026-10-17 12:15	Provisional

Download

Embed this gauge

Add a live card for this gauge to your website. It updates on its own and links back here.

<iframe src="https://nivelmap.com/embed/3136?lang=en" width="360" height="230" style="border:0;max-width:100%" loading="lazy" title="St Marys water level"></iframe>

How to cite

Environment Agency: St Marys (ea:E72324). Accessed October 17, 2026 via Nivelmap, https://nivelmap.com/en/united-kingdom/cornwall/st-marys

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