Station Information

Station ID: 350
Latitude: 50.80225
Longitude: -1.11125
Coastline code: 170
Station code: 131
Time span of RLR data: 1961 – 2023
RLR completeness (%): 92
Time span of metric data: 1930 – 2023
Metric completeness (%): 63
Link to ellipsoid: Available
Date of last update: 02 Feb 2024

Green Arrow: Current Station
Yellow Marker: Neighbouring RLR Station
Red Marker: Neighbouring Metric Station

Please note: In many cases, the station position in our database is accurate to only one minute. Thus, the tide gauge may not appear to be on the coast.

Additional Data Sources (guide to additional data sources)

Nearby GNSS Stations from SONEL: PMTG
Nearby Real Time Stations from VLIZ: ptmt

Station Documentation

Link to RLR information.

Documentation added 1991-06-11

Portsmouth 170/131 RLR(1971) is 10.2m below BM SU6270 0053

Documentation added 1992-05-05

Prior to 1991 data were received from UK Hydrographic Office

Documentation added 1994-07-21

Gauge details prior to 1960 are unclear. In 1960 a Lea stilling well gauge was installed, replaced in January 1991 by an "A Class" bubbler system.

Documentation added 1994-10-27

A letter to the Dock and Harbour Authority, No.61, page 385, 1981 by Webber and Walden castes doubts on the stability of the datum at Portsmouth during the 1960s and 1970s.

Documentation added 1997-07-16

Revised BM information for 1980-96

Documentation added 2001-01-02

Recent work on vertical land movements in the UK can be found from the University of Nottingham web site:http://ukcogr.iessg.nottingham.ac.uk/~eosi/

Documentation added 2012-05-24

Following re-leveling the Grid Reference for the Primary banchmark has changed from SU 6270 0053 to SU 6269 0053.

Documentation added 2014-07-04

There were no MSL's calculated for Portsmouth before August 2013 this was due to the fact that the primary channel, channel 2 was recording a constant -1.124m because of a leak on the

Documentation added 2015-05-18

TGI were at site 16.01.14 to carry out general maintenance and change the compressor.

Data Authority

Horizon House
Deanery Road