NANT-Y-GRO DAM, CABAN COCH RESERVOIR, ELAN VALLEY WATER SCHEME; USED FOR DAMBUSTERS TESTING

Site Details



NPRN
408280
Map Reference
SN96SW
Grid Reference
SN92196348
Unitary (Local) Authority
Powys
Old County
Brecknockshire
Community
Llanwrthwl
Type of Site
DAM
Broad Class
Water Supply and Drainage
Period
Post Medieval;19th Century

Site Description

Nant-y-Gro dam was a small gravity dam built during the construction of the Elan Valley Water Scheme (nprn 96459) between 1893 and 1904 to supply water to the workmen's village below and was abandoned on completion of the Scheme. It was used in 1942 for Dr. Barnes Wallis' secret tests during the development of the 'bouncing bomb' used to attack dams in Germany during the Dambusters raids. The test explosion left the dam with a large break in its centre measuring 19m wide and 8m high; the two remaining ends of the dam wall stand to their full height of 11m.
Source: Cadw scheduling description.
RCAHMW, 04 March 2011.

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