Mill Street over Conway Lake Outlet
GoodCarroll County, New Hampshire · 0.8 MI FR US RTE 302 · Structure no. 005401660013100
- Built
- 1940
- 85 years old, rebuilt 1994
- Condition
- Good
- inspected July 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 44 ft
- 1 main span
- Daily traffic
- 1,629
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Mill Street over Conway Lake Outlet is a prestressed concrete box beam or girders - multiple carrying Mill Street over Conway Lake Outlet in Carroll County, New Hampshire. It was built in 1940 and reconstructed in 1994, 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 1,629 vehicles a day, roughly 4% of them trucks, projected to reach 2,410 by 2043. The structure is 44 ft (13.4 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 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 Mill Street over Conway Lake Outlet built?
It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1994.
What condition is Mill Street over Conway Lake Outlet 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 July 2023.
How much traffic does Mill Street over Conway Lake Outlet carry?
About 1,629 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Mill Street over Conway Lake Outlet?
The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 40 ft wide.
Who owns Mill Street over Conway Lake Outlet?
It is owned by the City or Municipal Highway Agency.