Mill Hill Road over Dan Hole River
GoodCarroll County, New Hampshire · 146 Ft FR Dana Merrow RD · Structure no. 020401470023500
- Built
- 1940
- 85 years old, rebuilt 2019
- Condition
- Good
- inspected October 2024
- Type
- Slab
- Concrete
- Length
- 21 ft
- 1 main span
- Daily traffic
- 22
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Mill Hill Road over Dan Hole River is a concrete slab carrying Mill Hill Road over Dan Hole River in Carroll County, New Hampshire. It was built in 1940 and reconstructed in 2019, so it is 85 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 22 vehicles a day, roughly 4% of them trucks, projected to reach 32 by 2043. The structure is 21 ft (6.5 m) long and 23 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mill Hill Road over Dan Hole River built?
It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2019.
What condition is Mill Hill Road over Dan Hole 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 October 2024.
How much traffic does Mill Hill Road over Dan Hole River carry?
About 22 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Mill Hill Road over Dan Hole River?
The structure is 21 ft (6.5 m) long with a longest span of 20 ft (6.1 m) and a deck 23 ft wide.
Who owns Mill Hill Road over Dan Hole River?
It is owned by the City or Municipal Highway Agency.