NH175 over Pemigewasset River
GoodGrafton County, New Hampshire · 0.6 MI East JCT US 3 · Structure no. 028401950009300
- Built
- 1976
- 49 years old
- Condition
- Good
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 320 ft
- 3 main spans
- Daily traffic
- 682
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
NH175 over Pemigewasset River is a steel continuous stringer/multi-beam or girder carrying NH175 over Pemigewasset River in Grafton County, New Hampshire. It was built in 1976, so it is 49 years old, younger than the New Hampshire average of 56.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 682 vehicles a day, roughly 10% of them trucks, projected to reach 1,009 by 2043. The structure is 320 ft (97.5 m) long and 34 ft wide. If it were closed, the detour would be 8.7 mi (14 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was NH175 over Pemigewasset River built?
It was built in 1976, making it 49 years old in 2025.
What condition is NH175 over Pemigewasset River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2024.
How much traffic does NH175 over Pemigewasset River carry?
About 682 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is NH175 over Pemigewasset River?
The structure is 320 ft (97.5 m) long with a longest span of 121 ft (36.9 m) and a deck 34 ft wide.
Who owns NH175 over Pemigewasset River?
It is owned by the State Highway Agency.