River Levels
River Levels

Mawddach at Tyddyn Gwladys

Current River Level

0.450m

At 6:00am, Tuesday 19th March GMT

Within the usual range for this location

Rising, 0.050 from previous measurement at 4:00am, Tuesday 19th March GMT

Flood Warning Areas Covering Here

Mawddach and Wnion Catchment

Recent warnings or alerts no longer in force

Lleyn Peninsula and Cardigan Bay Coastline

Recent warnings or alerts no longer in force

Glaslyn and Dwyryd Catchment

Recent warnings or alerts no longer in force

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: Tyddyn Gwladys
  • Watercourse: Mawddach
  • Nearest Town/Village: Ganllwyd
  • Local Authority: Gwynedd
  • Ceremonial County: Gwynedd
  • Coordinates: 52°49'12"N 3°52'37"W (52.82019,-3.8770838)
  • OS Grid: SH7360526391 (,)
  • Mapcode (Local): GBR 61.V6PX
  • Mapcode (Global): WH569.FC0T
  • Open Location Code: 9C4RR4CF+35
  • Maidenhead Locator System: IO82bt46
  • Natural Resources Wales Location ID: 4150
  • Natural Resources Wales Gauge ID: 4150
  • Operational Area: Mawddach
  • Catchment Area: Meirionnydd
  • UK Hydrometric Area: Dyfi Group

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 Mawddach at Tyddyn Gwladys is between 0.16m and 1.23m. It has been between these levels for 90% of the time since monitoring began.

The typical recent level of the Mawddach at Tyddyn Gwladys over the past 12 months has been between 0.14m and 0.73m. It has been between these levels for at least 151 days in the past year.

The highest level ever recorded at the Mawddach at Tyddyn Gwladys is 4.08m, reached on Tuesday 3rd July 2001 at 8:15pm.

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 Mawddach

There are no other monitored rivers nearby

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