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NH-111 Flatrock Brook Bridge


NH-111 Flatrock Brook Bridge

Elevation from the southwest quadrant, showing curved stringer spans

Photo taken by Nick Boppel in June 2020


BH Photo #473981



This bridge was constructed as part of the project to relocate Route 111 away from the narrow road and sharp curves around Shadow Lake that was completed in 2007. The resulting "Shadow Lake Bypass" necessitated the construction of this bridge over Flatrock Brook and some associated wetlands, as well as Harris Road. While the bridge itself is not particularly noteworthy on a greater scale, it is a locally significant structure as it was one of the longest bridges built in the area at the time (this has since been surpassed) and is also noted for its unusual curved stringers. Good views of the bridge and the wetlands that it crosses can be had from a pulloff area on Harris Road directly underneath the bridge. The bridge is sometimes referred to as "The Big Bridge" by locals.


Steel stringer bridge over Flatrock Brook & Harris Road on New Hampshire Route 111
Windham, Rockingham County, New Hampshire
Open to traffic
Built 2007 as part of Shadow Lake Bypass project
Curved steel stringer
Length of largest span: 160.8 ft.
Total length: 601.1 ft.
Deck width: 31.2 ft.
Also called
The Big Bridge
Approximate latitude, longitude
+42.81465, -71.24649   (decimal degrees)
42°48'53" N, 71°14'47" W   (degrees°minutes'seconds")
Approximate UTM coordinates
19/316339/4742679 (zone/easting/northing)
Average daily traffic (as of 2010)
Inventory number
BH 89620 (Bridgehunter.com ID)
Inspection report (as of May 2017)
Overall condition: Good
Superstructure condition rating: Excellent (9 out of 9)
Substructure condition rating: Very Good (8 out of 9)
Deck condition rating: Very Good (8 out of 9)
Sufficiency rating: 81 (out of 100)
View more at BridgeReports.com

Update Log 

  • June 17, 2020: New photos from Nick Boppel


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