Bergmann Boardwalk.

Teatown Lake Reservation has a number of trails. One of my favorites is the Lakeside Trail, a pleasant 45 minutes to one hour (depending on how quickly you walk) stroll around the lake. Along the way you come across a variety of boardwalks – from the short ones designed to cross small muddy areas to the much longer Bergmann Boardwalk seen in the first and last pictures.

Short boardwalk – maybe puncheon is a better word for it.