I-93 NB over Mad River
GoodGrafton County, New Hampshire · 4.4 MI Plymouth Tl · Structure no. 003501340011500
- Built
- 1968
- 57 years old, rebuilt 2002
- Condition
- Good
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 105 ft
- 1 main span
- Daily traffic
- 10,012
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-93 NB over Mad River is a steel stringer/multi-beam or girder carrying I-93 NB over Mad River in Grafton County, New Hampshire. It was built in 1968 and reconstructed in 2002, so it is 57 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 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 10,012 vehicles a day, roughly 10% of them trucks, projected to reach 14,817 by 2043. The structure is 105 ft (31.9 m) long and 44 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 8 Very Good | No problems noted. |
| 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 I-93 NB over Mad River built?
It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2002.
What condition is I-93 NB over Mad 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 April 2023.
How much traffic does I-93 NB over Mad River carry?
About 10,012 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is I-93 NB over Mad River?
The structure is 105 ft (31.9 m) long with a longest span of 100 ft (30.5 m) and a deck 44 ft wide.
Who owns I-93 NB over Mad River?
It is owned by the State Highway Agency.