Millport tide gauge site

The tide gauge housing is located in the tide gauge room at the landward end of the University jetty.
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Tide gauge location

The tide gauge system is housed in an instrument cabinet in the tide gauge store room. There is also an Ott pneumatic chart recorder in the room attached to the bubbler system. The pneumatic tubes run down the jetty and the pressure points are fixed to a jetty leg.

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:

  • University Marine Biological Station, Millport

Site history

1966 – A Lea gauge was installed at Keppel Pier and operated by the University Marine Biological Station
1983 – The tide gauge structure was in poor condition and has been demolished
1985 – A new pier has been built
1985 – The DATARING system was installed with a single full-tide bubbler and a potentiometer attached to an Ott pneumatic gauge
1995 – All equipment removed for the refurbishment of the tide gauge room
1996 – New full- and mid-tide bubblers installed; the pneumatic tubes along the jetty were also replaced
2001 – New POL data logger installed
2003 – Jetty legs required refurbishment, and a temporary seabed frame mounted with pressure points was installed
2004 – New full- and mid-tide bubblers installed

Latitude55° 44.988'N
Longitude4° 54.36'W
Grid refNS 1769 5454
Earliest data1978
Tidal levels
HAT3.86 m
LAT-0.04 m
MHWS3.39 m
MHWN2.83 m
MLWN1.06 m
MLWS0.44 m
H for 2024 3.76 m
L for 2024 -0.04 m
H for 2025 3.69 m
L for 2025 0.00 m
MSR2.95 m
MNR1.77 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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