Llandudno tide gauge site
The tide gauge equipment and pressure points are located on the sub-platform under the pavilion at the seaward end of Llandudno Pier.
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Tide gauge location
The equipment is housed in a heated GRP building. The tide gauge consists of a pneumatic bubbler system supplying two full-tide and mid-tide pressure points which are mounted on steelwork attached to one of the pier legs beneath the pier pavilion. All pressure lines are monitored by the POL datalogger.
The tide gauge is levelled to the tide gauge bench mark supported by Ordnance Survey auxiliary marks.
External users
Sea level pressures and/or elevations from this site are supplied to the following authority:
- Environment Agency Wales / Asiantaeth yr Amgylchedd Cymru
Site history
1994 – DATARING system installed with two full-tide pressure points
2001 – POL data logger installed connected to the two full-tide measuring systems
2004 – Mid-tide measuring system connected to the POL data logger
| Location | |
| Latitude | 53° 19.908'N |
| Longitude | 3° 49.494'W |
| Grid ref | SH 7855 8319 |
| Earliest data | 1994 |
| Tidal levels | |
| HAT | 8.59 m |
| LAT | -0.42 m |
| MHWS | 7.68 m |
| MHWN | 5.97 m |
| MLWN | 2.20 m |
| MLWS | 0.48 m |
| H for 2024 | 8.53 m |
| L for 2024 | -0.40 m |
| H for 2025 | 8.39 m |
| L for 2025 | -0.28 m |
| MSR | 7.2 m |
| MNR | 3.77 m |
Abbreviations
HAT – highest astronomical tide
LAT – lowest astronomical tide
MHWS – mean high water springs
MHWN – mean high water neaps
MLWN – mean low water neaps
MLWS – mean low water springs
H – highest for year
L – lowest for year
MSR – mean spring range
MNR – mean neap range
Measurement devices
Tide gauge systemsFull-tide bubbler
Half-tide bubbler
Direct pressure transducer
Tide gauges
Ott pneumatic gauge
Munro float gauge
Wellhead float gauge
Lea float gauge
Instruments
DATARING logger
Datum probe