River Levels
River Levels

Dorset Coast at Portland

Latest Tidal Level

0.670m

At 6:00am, Sunday 5th February GMT

Within the usual range for this location

Rising, 0.780 from previous measurement at 4:00am, Sunday 5th February GMT


This is a tidal level, measured from mean sea level rather than from the river bed. It can, therefore, be negative, and does not give any indication of water depth. Tidal levels are not necessarily updated frequently, and may not reflect tidal movements throughout the day.

Flood Warning Areas Covering Here

Portland Harbour at Osprey Quay

No current or recent warnings.

West coast of Dorset

No current or recent warnings.

Dorset coast at Chiswell

No current or recent warnings.

Other Nearby Flood Warning Areas

Portland Harbour at Ferry Bridge

No current or recent warnings.

Weymouth Harbour at Weymouth Town

No current or recent warnings.

Seven Day Level Chart

Long Term Level Chart

Darker blue shaded areas on long term data indicate maximum and minimum levels for the date (you may need to zoom in closer to see them).

Long term data may have gaps where the API data was not available.

Download long term data as csv

Note: CSV data will include any outlying values that have been ignored by our graphing system as probably erroneous (eg, because they are ridiculously high compared to the values either side of them). It is your responsibility to filter these out if necessary.

Important! If you are planning to retrieve the csv data automatically, you must read and understand the limitations on the data and its availability.

Location and Technical Data

  • Monitoring Station: Portland
  • Watercourse: Dorset Coast
  • Nearest Town/Village: Portland
  • Local Authority:
  • Ceremonial County: Dorset
  • Coordinates: 50°34'11"N 2°26'27"W (50.569876,-2.441027)
  • OS Grid: SY688745 (368863,74552)
  • Mapcode (Local): GBR PZ.20X0
  • Mapcode (Global): FRA 57SK.DTM
  • Open Location Code: 9C2VHH95+XH
  • Maidenhead Locator System: IO80sn76
  • Environment Agency Location ID: 44106
  • Environment Agency Gauge ID: 44106-level-tidal_level-i-15_min-mAOD
  • Operational Area: West Dorset Rivers
  • Catchment Area: Dorset
  • UK Hydrometric Area: Frome Group
  • Environment Agency Region: South West
  • Level Datum: Above Ordnance Datum (AOD)

Please note: Geographic coordinates may reflect the access point for the gauge, and not the precise location in the watercourse that it is taking readings from.

The usual range of the Dorset Coast at Portland is between -0.73m and 1.36m. It has been between these levels for 90% of the time since monitoring began.

The typical recent level of the Dorset Coast at Portland over the past 12 months has been between -0.99m and 1.53m. It has been between these levels for at least 150 days in the past year.

The highest level ever recorded at the Dorset Coast at Portland is 2.02m, reached on Friday 14th February 2014 at 7:30pm.

Note that this data may not take account of recent measurements, as we wait until a level has been verified by the Environment Agency before adding it to our records.

Nearby Monitoring Locations

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