I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
Wentwood Reservoir was completed by Newport Corporation 1896-1903, and opened in 1904, after geological difficulties crippled Glasgow contractors. There is a two and half mile tunnel from Castroggy Brook to the north. The dam was constructed using locally-quarried stone with an aerial ropeway from the east for clay. The area of the trout reservoir is 16.6 ha (41 acre) and it is located on the edge of Wentwood Forest.
Claire Parry, RCAHMW, 4 August 2011.
The reservoir itself is private land, however, there's a nearby car park suitable for TOAL.
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The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 12/03/2023. It remains the responsibility of any pilot to check for any changes before flying at the same location.