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Mallard Road Bridges


Mallard Road Bridges

Distant elevation of concrete rigid frame bridge facing northeast

Photo taken by Nick Boppel in May 2020


BH Photo #471515



The Mallard Road Bridge is a unique instance of a "bridge under a bridge" - where two bridges serving two different purposes literally are built over each other.

In this case, a large concrete rigid-frame bridge carries the Windham Rail Trail (former Boston & Maine Railroad) over Mallard Road. Directly below, a much smaller concrete slab bridge carries Mallard Road over Flatrock Brook as the brook empties into Mallard Pond.

The Detroit-Superior Bridge and Center Street Bridge in Cleveland, Ohio is among the best known instances of an intentional "bridge under a bridge". Prior to its demolition, the safety structure built under the Breezewood Boulevard Bridge over Interstate 376 outside of Pittsburgh, PA was also referred to as a "bridge under a bridge".


Concrete rigid frame bridge over Mallard Road on Windham Rail-Trail & Concrete slab bridge over Flatrock Brook on Mallard Road
Windham, Rockingham County, New Hampshire
Open to traffic
- Boston & Maine Railroad (BM)
Concrete rigid frame (Windham Rail Trail over Mallard Road)
Concrete slab (Mallard Road over Flatrock Brook)
Approximate latitude, longitude
+42.84213, -71.28366   (decimal degrees)
42°50'32" N, 71°17'01" W   (degrees°minutes'seconds")
Approximate UTM coordinates
19/313382/4745813 (zone/easting/northing)
Inventory number
BH 88980 (Bridgehunter.com ID)

Update Log 

  • May 3, 2020: New photos from Nick Boppel
  • April 13, 2020: New photos from Nick Boppel


  • Nick Boppel - nickboppel01 [at] gmail [dot] com