Llyn Tegid, Gwynedd

Natural Resources Wales (NRW) is planning work to make sure Wales’ largest natural lake, Llyn Tegid in Bala, remains safe in the long-term

Work to keep Llyn Tegid safe


Although Llyn Tegid is a natural lake, it also needs to be managed under reservoir legislation as the lake’s embankments give protection from flooding to the town of Bala. This was seen most recently following heavy rain in March 2019 (see photos from this event and how Bala used to be affected before the 1950’s defences were constructed). The lake also plays a vital role in managing floods in the Dee Valley. During an inspection, some issues were raised about the embankments’ ability to withstand extreme events in the long-term, although there are no immediate concerns.

The work will involve strengthening the embankments and improving the lakeshore wave protection. This is part of our work to regulate Llyn Tegid under the Reservoirs Act 1975 and is part of a wider ongoing programme of reservoir safety work across Wales. The proposals are now being developed in detail and we intend to submit a Full Planning Application early in the new year.

We are planning to hold a drop-in session on the 17th December from 14:00 – 19:30 at Penllyn Leisure Centre where you can find out more about our plans in detail and how we have taken on board your views.

Some key feedback from our previous drop-in event in July 2018 and discussions since then with local groups and individuals included:

  • The importance of local community engagement in developing the mitigation and enhancement plans associated with the scheme.
  • The desire to retain some mature trees within the proposals to strengthen the lake’s embankments where possible.
  • Concern over construction impact on Bala over summer and effect on local traffic.
  • The potential to improve existing pubic rights of way .
  • The opportunity to establish wildflower areas along the Dee and Tryweryn.

We have been working closely with key stakeholders recently to try and address these points as we have been developing our plans in detail. These have included Bala Town Council, Snowdonia National Park Authority, Gwynedd Council, Councillor Dilwyn Morgan, Lord Dafydd Elis-Thomas AM, Woodland Trust, Women’s Institute and Merched y Wawr.

The feedback from this engagement has been very valuable. We have received ideas including:

  • footpath and access improvements (including improving access for people of all abilities by; reducing barriers, upgrading surfaces, reducing ramp gradients and targeted improvements around Penllyn Leisure Centre)
  • new public seating areas
  • car park upgrades
  • habitat restoration and new tree and hedgerow planting

At this early stage, it’s difficult to give an overall timescale for the project. However, construction is not expected to start until late Autumn 2020, subject to the necessary planning permission and other approvals that might be necessary.

You can find out more about this work by reading our answers to frequently asked questions about the Llyn Tegid safety works.

If you have any further enquiries at this stage, please let us know by emailing: LlynTegid@cyfoethnaturiolcymru.gov.uk