Participants in many of my water walking tours have consistently told me I must go see the basement of the Armory.

I finally did!

The building’s current owner, porn company Kink.com, gives studio tours that include a brief visit to the sub-basement. There, where many channels of water flow in rough concrete trenches, they tell us we’re looking at Mission Creek.

Our Kink.com guides, Odile and Miguel, were excited to see the official map of historic waterways in the Mission District that I’d brought along.

They noted the tributary creek that once ran past […]