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Griffin Mill Road over Maple Falls Brook

Rockingham County, New Hampshire · rated Poor in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Griffin Mill Road over Maple Falls Brook in Rockingham County, New Hampshire, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 1 (imminent failure condition) on the 0-9 scale.
It was built in 1850 and reconstructed in 1991, making it 175 years old at the 2025 inventory.
It carries about 208 vehicles a day (traffic count year 2023).
Its listed owner is a city or municipal highway agency.
It is one of 22 of the 309 inventoried bridges in Rockingham County rated poor (7.1%); 22 (7.1%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 28 ft
Location	300 Yds N. of Nh 121
NBI structure number	001300950012700
Condition class	Poor

Source: FHWA National Bridge Inventory, 2025 data as reported by the New Hampshire department of transportation.

Bridge	Built	Vehicles/day	Condition
I-95 over Access Road	1950	86,429	Fair
I-95 over Maplewood Avenue	1970	76,465	Fair
I-95 over Preble Way CSX	1971	74,766	Fair
I-95 over Piscataqua River	1971	74,766	Fair
I-95 over Market Street	1970	70,573	Good
US 4 Nh 16 Sp Tpk over Shawayttuck	1983	68,236	Good