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LLYN GELLI-GAIN RESERVOIR, TRAWSFYNYDD

Manylion y Safle

© Copyright and database right 2019. All rights reserved. Ordnance Survey licence number 0100022206

NPRN 424210

Cyfeirnod Map SH73SW

Cyfeirnod Grid SH7340532805

Awdurdod Lleol Gwynedd 

Hen Sir Meirionnydd

Cymuned Trawsfynydd

Math o Safle CRONFA DDWR, LLYN

Dosbarth Cyffredinol CYFLENWI A DRAENIO DWR

Cyfnod Anhysbys

Disgrifiad o´r Safle LLyn Gelli-Gaer is located approximately two and a half miles south east of Trawsfynydd, and has a perimeter of 1.25 km. In 2018, Dŵr Cymru decided to look 'into the possible removal of the existing concrete dam (reservoir discontinuance)' in the lake. The following information was therefore supplied by Stillwater Associates Limited to Gwynedd Archaeological Trust on behalf of Dŵr Cymru, as part of a feasibility study and archaeological assessment.
'The reservoir was located within an upland area east of Trawsfynydd and Bronaber, within the Snowdonia National Park. It is a raised natural lake, impounded by a small gravity dam. The dam is a mass concrete stepped wall gravity structure 1.6m high and 27m long, with boulders placed on the downstream side. The spillway is constructed of concrete and comprises a broad-crested weir and a small downstream chute. The chute comprises wing walls and a base slab. There is also a small linear concrete structure within the reservoir some 50m upstream of the dam, the purpose of which is unknown. The removal strategy has not been confirmed, but may include removing all concrete parts above ground (possible leaving in concrete foundations/cut-off walls), with smaller infrastructure possibly also left behind, such as a small weir to control future water levels. The water body would return to a natural lake on its original footprint.'
Source: Gwynedd Archaeological Trust report entitled 'Gelli Gain Reservoir, Gwynedd: Archaeological Assessment' by Robert Evans and John Evans (report no. 1445 and project no. G2579)
M. Ryder, RCAHMW, 11th April 2019

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