Milford Haven tide gauge site

The tide gauge housing is located in the workshop at the landward end of the Milford Haven Port Authority jetty.
Click here to see a map of the site in a separate window.

Tide gauge location

A GRP cabinet houses the tide gauge equipment which consists of a POL data logger and a 3 channel bubbler system. Pneumatic tubes run down the jetty and the pressure points are fixed to the jetty wall.

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

1953 – A Munro gauge was operational in the Royal Naval Armaments depot at Newton Noyes, Milford Haven
1989 – New site established on the Milford Haven Port Authority jetty; the DATARING system was installed with two full-tide bubblers
1995 – New full- and mid-tide bubblers installed
2001 – New POL data logger installed
2003 – New full- and mid-tide bubblers installed; the pneumatic tubes along the jetty were also replaced

Latitude51° 42.444'N
Longitude5° 3.108'W
Grid refSM 8924 0537
Earliest data1953
Tidal levels
HAT7.85 m
LAT-0.04 m
MHWS7.04 m
MHWN5.29 m
MLWN2.47 m
MLWS0.76 m
H for 2024 7.80 m
L for 2024 -0.01 m
H for 2025 7.64 m
L for 2025 0.08 m
MSR6.28 m
MNR2.82 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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