Just what are these things? Size-wise, they are about six feet tall, and about the width of a garage. They are massive, to prevent them being swept away during the plain's frequent flooding. I'm guessing they are some sort of valve. By the way, the valve, or fireplug, or fire hydrant to the right is manufactured by Kennedy Valve, right here in Elmira, NY, USA. Actually McWane International. If you check the valves in your town, they might just say, Elmira, NY on them, too.