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.

Tide gauge location 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

Latitude53° 19.908'N
Longitude3° 49.494'W
Grid refSH 7855 8319
Earliest data1994
Tidal levels
HAT8.59 m
LAT-0.42 m
MHWS7.68 m
MHWN5.97 m
MLWN2.20 m
MLWS0.48 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
MSR7.2 m
MNR3.77 m

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

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