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Trefriw flood alleviation


Summary (optional)
This scheme will reduce the frequency of road closures caused by flooding.
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Public drop ins:

Monday 28 July 1pm - 6pm
Trefriw Village Hall, Trefriw, LL27 0JH

Tuesday 29 July 1pm - 6pm
Dolgarrog Community Centre, Dolgarrog, LL32 8JU

About the scheme

Conwy County Borough Council has been awarded funding from UK Government to reduce the risk of Trefriw becoming isolated during floods.

The first phase of work took place in 2024. Before starting the first phase of work, we worked to make sure that we understand the causes of the flooding, and how to reduce it. This included confirming flow rates, topographical surveys and design work.

What are the issues?

During severe weather Trefriw gets cut off by flood water, making it difficult to access emergency services, schools, shops and work.

Flooding on the B5106 is mainly caused by:

  • high water levels in the Afon Conwy
  • problems with watercourse culverts under the B5106

What's happening?

Proposed work to reduce flooding includes:

  • making the culverts larger and improve their inlets (2024-2025)
  • lifting the B5106 above the Afon Conwy flood level (2025-2026)

This scheme will reduce the frequency of road closures caused by flooding.

What’s already happened?

During 2024/25 we worked on five watercourse culverts:

  • Little Canada – enlarged the culvert and straightened it out
  • Quarry – provided a screen to remove large rocks, enlarged the culvert across the quarry access and provided new pipes under the road
  • Coed Gwydyr (north) – enlarged the culvert and straightened out the inlet
  • Coed Gwydyr (south) – enlarged the culvert under the B5106, and collected overspills from ditches on Trefriw Terrace into a new highway drain
  • Glan Aber – enlarged the culvert and straightened out the inlet

What’s happening next?

During 2025/26, we will raise the B5106 in the low spots which dip below the river flood levels.

We will have to close the section of road to complete this work. There will be no access through this section of road at times - there will be a diversion signposted.

This scheme will reduce the frequency of road closures caused by flooding.

Diversions map

 

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