Valve tower and access bridge, Pontsticill Reservoir

Valve tower and access bridge, Pontsticill Reservoir is a castle, fort or tower in Merthyr Tydfil, Wales. Perhaps the bridge is a tongue of stone reaching into water, testing depth before the main body follows. Maybe the tower holds a valve for rain, turning rainfall into drinking water for whole valleys. Imagine a keeper standing on the bridge at dawn, listening for the sound of clean water moving through hidden pipes.