Nh 1B over Little Harbor
PoorPosted for loadRockingham County, New Hampshire · 1.1 MI JCT Rt 1-A · Structure no. 018100660007100
- Built
- 1942
- 83 years old, rebuilt 1975
- Condition
- Poor
- inspected November 2024
- Type
- Movable - Bascule
- Steel
- Length
- 254 ft
- 1 main span
- Daily traffic
- 3,359
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Nh 1B over Little Harbor is a steel movable - bascule carrying Nh 1B over Little Harbor in Rockingham County, New Hampshire. It was built in 1942 and reconstructed in 1975, so it is 83 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 3,359 vehicles a day, roughly 5% of them trucks, projected to reach 4,971 by 2043. The structure is 254 ft (77.3 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Nh 1B over Little Harbor built?
It was built in 1942, making it 83 years old in 2025. It was reconstructed in 1975.
What condition is Nh 1B over Little Harbor 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 Nh 1B over Little Harbor carry?
About 3,359 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is Nh 1B over Little Harbor?
The structure is 254 ft (77.3 m) long with a longest span of 43 ft (13.1 m) and a deck 31 ft wide.
Who owns Nh 1B over Little Harbor?
It is owned by the State Highway Agency.