Llyn y Fan Fach Reservoir Dam is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 16 February 2022. A 20th century Dam.

Llyn y Fan Fach Reservoir Dam

WRENN ID
little-landing-kestrel
Grade
II
Local Planning Authority
Brecon Beacons National Park
Country
Wales
Date first listed
16 February 2022
Type
Dam
Address
Llyn y Fan Fach Reservoir Dam, Llanddeusant, Carmarthenshire
OS grid reference
SN 803 219
Coordinates
51.88356, -3.74014
Source
Cadw listing

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Description

The Llyn y Fan Fach Reservoir Dam is a Grade II listed structure, approximately 65 meters long and oriented from west-northwest to east-southeast. It features a concave concrete wall. At the center of the dam, there is a spillway and weir, which has side walls made of quarried rubble stone topped with concrete copings, along with a concrete stream bed. A circular valve tower is built into the rear face of the dam, allowing for water extraction from the reservoir via a siphon. This siphon leads to an outlet tunnel located about 75 meters to the north, which passes under a stone arch with splayed flanking walls. The keystone of the arch is inscribed with the date 1920.

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Nearby listed buildings

  1. Former filter beds on Afon Sawdde below Llyn y Fan Fach Reservoir, including weirs Grade II 1.0 km
  2. Valve House on former filter beds on Afon Sawdde below Llyn y Fan Fach Reservoir, including weirs Grade II 1.0 km
  3. Bridge over Nant Melyn Grade II 1.8 km
  4. Gorsddu Grade II 2.6 km
  5. Blaensawdde Grade II 2.7 km
  6. Barn range at Blaensawdde Grade II 2.7 km
  7. Range of outbuildings at Cwmsawdde Grade II 3.5 km
  8. Cwmsawdde Grade II 3.5 km
  9. Church of St Simon and St Jude Grade II* 3.7 km
  10. Ty Brych Grade II 4.8 km