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.
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
Location | |
Latitude | 49° 10.572'N |
Longitude | 2° 6.876'W |
Grid ref | Not available |
Earliest data | 1992 |
Tidal levels | |
HAT | 12.18 m |
LAT | 0.10 m |
MHWS | 11.00 m |
MHWN | 8.02 m |
MLWN | 4.11 m |
MLWS | 1.33 m |
H for 2023 | 12.03 m |
L for 2023 | 0.26 m |
H for 2024 | 12.15 m |
L for 2024 | 0.10 m |
MSR | 9.67 m |
MNR | 3.91 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