NH111 WB over Merrimack River
FairHillsborough County, New Hampshire · .1 MI West of JCT Rt 3A · Structure no. 013101090006800
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 602 ft
- 4 main spans
- Daily traffic
- 17,275
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
NH111 WB over Merrimack River is a steel continuous stringer/multi-beam or girder carrying NH111 WB over Merrimack River in Hillsborough County, New Hampshire. It was built in 1970, so it is 55 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 17,275 vehicles a day, roughly 5% of them trucks, projected to reach 25,567 by 2043. The structure is 602 ft (183.5 m) long and 37 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 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 NH111 WB over Merrimack River built?
It was built in 1970, making it 55 years old in 2025.
What condition is NH111 WB over Merrimack River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2023.
How much traffic does NH111 WB over Merrimack River carry?
About 17,275 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is NH111 WB over Merrimack River?
The structure is 602 ft (183.5 m) long with a longest span of 173 ft (52.7 m) and a deck 37 ft wide.
Who owns NH111 WB over Merrimack River?
It is owned by the City or Municipal Highway Agency.