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North River Road over Purgatory Brook

Hillsborough County, New Hampshire · rated Good in the 2025 National Bridge Inventory

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

North River Road over Purgatory Brook in Hillsborough County, New Hampshire, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1978, making it 47 years old at the 2025 inventory.
It carries about 2,702 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 201 of the 385 inventoried bridges in Hillsborough County rated good (52.2%); 31 (8.1%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 40 ft
Location	.64 Mi Lyndeboro Tl.
NBI structure number	017200760015200
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Fee Tpk N&S Ramps over Salmon Brook	1955	128,889	Good
Fee Tpk over Greeley Street	1993	78,063	Good
Fee Tpk over Souhegan River	1953	75,081	Good
Fee Tpk over Baboosic Brook	1954	75,081	Good
US 3 Fee Tpk NB over Nashua River	1955	73,979	Fair
US 3 Fee Tpk SB over Nashua River	1959	71,221	Good