US 4 over Crystal Lake Brook
GoodGrafton County, New Hampshire · 0.6 MI from Enfield Tl · Structure no. 003600960003900
- Built
- 1941
- 84 years old, rebuilt 1993
- Condition
- Good
- inspected May 2024
- Type
- Slab
- Concrete Continuous
- Length
- 76 ft
- 3 main spans
- Daily traffic
- 7,633
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 4 over Crystal Lake Brook is a concrete continuous slab carrying US 4 over Crystal Lake Brook in Grafton County, New Hampshire. It was built in 1941 and reconstructed in 1993, so it is 84 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 7,633 vehicles a day, roughly 7% of them trucks, projected to reach 11,296 by 2043. The structure is 76 ft (23.2 m) long and 47 ft wide. If it were closed, the detour would be 31.7 mi (51 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 | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 4 over Crystal Lake Brook built?
It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1993.
What condition is US 4 over Crystal Lake Brook 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 2024.
How much traffic does US 4 over Crystal Lake Brook carry?
About 7,633 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is US 4 over Crystal Lake Brook?
The structure is 76 ft (23.2 m) long with a longest span of 26 ft (7.9 m) and a deck 47 ft wide.
Who owns US 4 over Crystal Lake Brook?
It is owned by the State Highway Agency.