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
Source: Cadw listing

Description

The reservoir dam is approximately 65m long WNW-ESE, in the form of a concave concrete wall. In the centre is a spillway and weir, which has quarried rubble stone side walls with concrete copings, and concrete stream bed. Built into the rear face of the dam is a circular valve tower, enabling extraction of water from the reservoir by a siphon, leading to an outlet tunnel at the base of the dam wall, approximately 75 metres N, under a stone arch and splayed flanking walls, with the date 1920 inscribed on the keystone.

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