This is a small chamber-like structure near a road in Danbury. When I found this place (October 2009) the structure had water running through it and into a modern culvert under the road. Behind the berm that the structure is built into, there is a swampy area. Some of the stonework at the back of the chamber is visible but there is no entrance at the rear. It seems possible that the structure is dry at some times of the year.