The South Gatehouse: E86

On the Reservoir rim are two fortress-like stone gatehouses, one on the south and the other on the north.
Built as stations for monitoring the amount and quality of the water, the south gatehouse, the larger of the two buildings is still minimally staffed.
The stone divide passing from one to the other enables one section to be isolated from the other for maintenance purposes.
Many runners begin their trek around the Reservoir at this spot a fact, which has made it a popular rendezvous spot for friends who meet here for their daily jog.