St. Helier tide gauge site

The tide gauge is located on Victoria Pier St Helier, adjacent to the Port Control building. The pressure points are located on the inside wall of the pier 2m from the tide gauge building.
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Tide gauge location

The equipment is housed in a heated instrument cabinet within the harbour tide gauge building, with the full-tide and mid-tide pressure points being mounted on steelwork attached to the pier wall. All three pressure lines are monitored by the POL data logger.

Tide gauge location The tide gauge is levelled to the tide gauge bench mark supported by States of Jersey Survey auxiliary marks.

External users

Sea level pressures and/or elevations from this site are supplied to the following authority:

  • States of Jersey Harbour

Site history

1992 – DATARING system installed with two full-tide and a mid-tide bubblers
2001 – POL data logger installed with two full-tide pressure points connected

Latitude49° 10.572'N
Longitude2° 6.876'W
Grid refNot available
Earliest data1992
Tidal levels
HAT12.18 m
LAT0.10 m
MHWS11.00 m
MHWN8.02 m
MLWN4.11 m
MLWS1.33 m
H for 2024 12.15 m
L for 2024 0.10 m
H for 2025 11.93 m
L for 2025 0.36 m
MSR9.67 m
MNR3.91 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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