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Salmon Street EB over Merrimack R CSX Rd Ramp

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

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

Salmon Street EB over Merrimack R CSX Rd Ramp in Hillsborough 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 4 (poor condition) on the 0-9 scale.
It was built in 1970 and reconstructed in 1999, making it 55 years old at the 2025 inventory.
It carries about 13,150 vehicles a day (traffic count year 2023).
Its listed owner is a city or municipal highway agency.
It is one of 31 of the 385 inventoried bridges in Hillsborough County rated poor (8.1%); 31 (8.1%) 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	Continuous steel stringer or multi-beam girder
Length	about 1,022 ft
Location	0.3MI W of Jct Rt 3
NBI structure number	016101070007200
Condition class	Poor

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