Tripoli Road over Mad River
FairGrafton County, New Hampshire · .29 Mi. from Jct. Rte. 49 · Structure no. 026601260010300
- Built
- 1968
- 57 years old, rebuilt 2000
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 168 ft
- 3 main spans
- Daily traffic
- 415
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Tripoli Road over Mad River is a steel continuous stringer/multi-beam or girder carrying Tripoli Road over Mad River in Grafton County, New Hampshire. It was built in 1968 and reconstructed in 2000, 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 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 415 vehicles a day, roughly 4% of them trucks, projected to reach 614 by 2043. The structure is 168 ft (51.2 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Tripoli Road over Mad River built?
It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2000.
What condition is Tripoli Road over Mad 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 August 2024.
How much traffic does Tripoli Road over Mad River carry?
About 415 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Tripoli Road over Mad River?
The structure is 168 ft (51.2 m) long with a longest span of 73 ft (22.3 m) and a deck 36 ft wide.
Who owns Tripoli Road over Mad River?
It is owned by the State Highway Agency.