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Nh 28 Bypass over Cohas Brook

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

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

Nh 28 Bypass over Cohas Brook in Rockingham County, New Hampshire, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1937, making it 88 years old at the 2025 inventory.
It carries about 5,769 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 87 of the 309 inventoried bridges in Rockingham County rated fair (28.2%); 22 (7.1%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings

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