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SwedenSt Marys water level
Tidal gauge, Cornwall, United Kingdom
Right now
Latest reading
Surface elevation
History
What this means
The Environment Agency has St Marys at −0.05 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.
It is still going down, by 0.48 m over the past 24 hours. The 30-day range is −2.16 m – 3.24 m.
Over the past seven days the change adds up to −2.76 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
- −2.16 m – 3.24 m
Weather at the gauge
Rain in the last 3 days: 4.4 mm. Rain that falls upstream can take hours or days to show up at a river gauge.
Forecast: Open-Meteo
Map
Nearby gauges
| Gauge | Level | Compared with normal | 24 hours | Distance |
|---|---|---|---|---|
| St MarysTidal gauge | 2.86 m | No reference yet | −0.48 m | 0.0 km |
| PenberthRiver gauge, Penberth Stream | 0.19 m | Very low | −0.03 m | 51 km |
| Newlyn CoombeRiver gauge, Newlyn Coombe River | 0.11 m | Lowest on record | −0.01 m | 59 km |
| Penzance AlvertonRiver gauge, Lariggan River | 0.07 m | Very low | ±0 | 59 km |
| NewlynTidal gauge | −0.07 m | No reference yet | −0.55 m | 59 km |
| NewlynTidal gauge | 2.98 m | No reference yet | −0.55 m | 59 km |
| St Ives Consols FarmRiver gauge, River Stennack | 0.05 m | Very low | −0.01 m | 67 km |
| St ErthRiver gauge, River Hayle | 0.17 m | Very low | −0.01 m | 69 km |
Questions and answers
Is St Marys really −0.05 m deep?
No. −0.05 m is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.
What is the water level of St Marys today?
On 17 Oct 2026, 18:15 BST, the surface elevation was −0.05 m. Down 0.48 m over the last 24 hours.
Is St Marys rising or falling?
Down 0.48 m over the last 24 hours. Down 2.76 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:E72339- Coordinates
49.91786, -6.31722(WGS84)- Vertical datum
- ODN
- 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 |
|---|---|---|---|
| Surface elevation | −0.05 m | 2026-10-17 17:15 | Provisional |
Download
Embed this gauge
Add a live card for this gauge to your website. It updates on its own and links back here.
How to cite
Environment Agency: St Marys (ea:E72339). Accessed October 17, 2026 via Nivelmap, https://nivelmap.com/en/united-kingdom/cornwall/st-marys-e72339
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