Nh 18 over I-93 Parkway
GoodGrafton County, New Hampshire · 3 Mi.N Lincoln Tl · Structure no. 008701320007900
- Built
- 1986
- 39 years old
- Condition
- Good
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 155 ft
- 1 main span
- Daily traffic
- 587
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Nh 18 over I-93 Parkway is a steel stringer/multi-beam or girder carrying Nh 18 over I-93 Parkway in Grafton County, New Hampshire. It was built in 1986, so it is 39 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 587 vehicles a day, roughly 10% of them trucks, projected to reach 868 by 2043. The structure is 155 ft (47.2 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Nh 18 over I-93 Parkway built?
It was built in 1986, making it 39 years old in 2025.
What condition is Nh 18 over I-93 Parkway 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 May 2023.
How much traffic does Nh 18 over I-93 Parkway carry?
About 587 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is Nh 18 over I-93 Parkway?
The structure is 155 ft (47.2 m) long with a longest span of 150 ft (45.7 m) and a deck 46 ft wide.
Who owns Nh 18 over I-93 Parkway?
It is owned by the State Highway Agency.