US 4 over Nhrr(abd)

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

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

• US 4 over Nhrr(abd) in Merrimack 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 9 (excellent condition) on the 0-9 scale.
• It was built in 2023, making it 2 years old at the 2025 inventory.
• It carries about 2,503 vehicles a day (traffic count year 2023).
• Its listed owner is the state highway agency.
• It is one of 146 of the 326 inventoried bridges in Merrimack County rated good (44.8%); 27 (8.3%) 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.

View this bridge on a map → (43.51948, -71.86418)

Component ratings

Bridge details

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

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Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.