Avonmouth tide gauge site

The tide gauge building is located on land between the wartime jetty and the fuel storage depot, with the measuring points being attached to the superstructure of the wartime Jetty.
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Tide gauge location

The tide gauge equipment is housed in a GRP building with the power and signal wires running under the land, along the jetty and down to the transducers. Both signal lines are monitored by the POL data logger.

Panoramic view of tide gauge location
The tide gauge is levelled to the tide gauge bench mark supported by Ordnance Survey auxiliary marks.

External users

There are currently no external users.

Site history

1984 – DATARING system installed with two full tide bubblers
1984 – A ship collided with the jetty causing extensive damage to the tide gauge
1985 – A temporary tide gauge was installed using an Aanderra gauge
1986 – DATARING system reinstalled with two full tide bubblers
1989 – Pressure points buried in mud; both pressure points lifted clear of the mud
1993 – The pneumatic system was replaced with transducers mounted underwater
2000 – New pressure transducers installed underwater
2001 – New POL data logger installed recording the two full tide sensors
2011 – Site decommissioned – superseded by Portbury (south side of the mouth of the River Avon)

Latitude51° 30.648'N
Longitude2° 42.906'W
Grid refST 5063 7900
Earliest data1984
Tidal levels
HAT14.65 m
LAT-0.20 m
MHWS13.33 m
MHWN9.99 m
MLWN3.78 m
MLWS1.06 m
H for 2024 14.53 m
L for 2024 -0.13 m
H for 2025 14.28 m
L for 2025 0.25 m
MSR12.27 m
MNR6.21 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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