NH175 over Pemigewasset River
PoorPosted for loadGrafton County, New Hampshire · 0.05 MI from JCT RTE 3 · Structure no. 028401770014800
- Built
- 1939
- 86 years old
- Condition
- Poor
- inspected November 2024
- Type
- Arch - Thru
- Steel
- Length
- 183 ft
- 1 main span
- Daily traffic
- 674
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
NH175 over Pemigewasset River is a steel arch - thru carrying NH175 over Pemigewasset River in Grafton County, New Hampshire. It was built in 1939, so it is 86 years old, older than the New Hampshire average of 56.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.
It carries about 674 vehicles a day, roughly 10% of them trucks, projected to reach 997 by 2043. The structure is 183 ft (55.8 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was NH175 over Pemigewasset River built?
It was built in 1939, making it 86 years old in 2025.
What condition is NH175 over Pemigewasset River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.
How much traffic does NH175 over Pemigewasset River carry?
About 674 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is NH175 over Pemigewasset River?
The structure is 183 ft (55.8 m) long with a longest span of 172 ft (52.4 m) and a deck 31 ft wide.
Who owns NH175 over Pemigewasset River?
It is owned by the State Highway Agency.