Portsmouth tide gauge site

The brick tide gauge building is located on Victory jetty in Portsmouth Royal Naval Base.
Click here to see a map of the site in a separate window.

Tide gauge location

The measuring system is located on the south west corner of Victory jetty. In the building there is an instrument cabinet with a pneumatic bubbler system with two full-tide and mid-tide sensors.

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, Southern Region

Site history

1960 – A Lea gauge was installed over the stilling well in the tide gauge building at Kings Stairs jetty
1991 – The DATARING system was installed with two full-tide bubbler systems
1999 – A new tide gauge site was established on Victory jetty; two full-tide and mid-tide bubblers were installed
2001 – POL data logger installed

Latitude50° 48.131'N
Longitude1° 6.671'W
Grid refSU 6273 0067
Earliest data1991
Tidal levels
HAT5.13 m
LAT0.14 m
MHWS4.72 m
MHWN3.87 m
MLWN1.90 m
MLWS0.73 m
H for 2024 5.08 m
L for 2024 0.20 m
H for 2025 5.02 m
L for 2025 0.26 m
MSR3.99 m
MNR1.97 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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