I-89 SB over Mascoma R Riverside DR
GoodGrafton County, New Hampshire · 2.0MI from Enfield T.L. · Structure no. 014401590011200
- Built
- 1966
- 59 years old, rebuilt 1987
- Condition
- Good
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 307 ft
- 4 main spans
- Daily traffic
- 16,677
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-89 SB over Mascoma R Riverside DR is a steel stringer/multi-beam or girder carrying I-89 SB over Mascoma R Riverside DR in Grafton County, New Hampshire. It was built in 1966 and reconstructed in 1987, so it is 59 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 16,677 vehicles a day, roughly 9% of them trucks, projected to reach 24,681 by 2043. The structure is 307 ft (93.6 m) long and 42 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. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-89 SB over Mascoma R Riverside DR built?
It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1987.
What condition is I-89 SB over Mascoma R Riverside DR 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 I-89 SB over Mascoma R Riverside DR carry?
About 16,677 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is I-89 SB over Mascoma R Riverside DR?
The structure is 307 ft (93.6 m) long with a longest span of 81 ft (24.7 m) and a deck 42 ft wide.
Who owns I-89 SB over Mascoma R Riverside DR?
It is owned by the State Highway Agency.