River Levels
River Levels

Tryweryn at Bala Weir X

Current River Level


At 5:00pm, Monday 29th May BST
(4:00pm, Monday 29th May GMT)

Within the usual range for this location

Steady, no change from previous measurement at 3:00pm, Monday 29th May BST

Flood Warning Areas Covering Here

Upper Dee Valley

No current or recent warnings.

Other Nearby Flood Warning Areas

Dysynni Catchment

No current or recent warnings.

Glaslyn and Dwyryd Catchment

No current or recent warnings.

Mawddach and Wnion Catchment

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: Bala Weir X
  • Watercourse: Tryweryn
  • Nearest Town/Village: Llandderfel
  • Local Authority: Gwynedd
  • Ceremonial County: Gwynedd
  • Coordinates: 52°54'37"N 3°35'23"W (52.910425,-3.5897706)
  • OS Grid: SH9318735961 (,)
  • Mapcode (Local): GBR 6D.NQGV
  • Mapcode (Global): WH675.T3RM
  • Open Location Code: 9C4RWC66+53
  • Maidenhead Locator System: IO82ev98
  • Natural Resources Wales Location ID: 4153
  • Natural Resources Wales Gauge ID: 4153
  • Operational Area: Dee Upper above Alwen
  • Catchment Area: Dee
  • UK Hydrometric Area: Dee (Cheshire)

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 Tryweryn at Bala Weir X is between 0.22m and 1.10m. It has been between these levels for 90% of the time since monitoring began.

The typical recent level of the Tryweryn at Bala Weir X over the past 12 months has been between 0.22m and 1.16m. It has been between these levels for at least 150 days in the past year.

The highest level ever recorded at the Tryweryn at Bala Weir X is 1.51m, reached on Saturday 22nd February 2020 at 1:30am.

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

Nearby Monitoring Locations

There are no other monitoring stations on the Tryweryn

Monitoring locations on nearby rivers

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