US 3 over Lost River
PoorGrafton County, New Hampshire · 5.6 MI from Thornton Tl · Structure no. 028401710015300
- Built
- 1931
- 94 years old
- Condition
- Poor
- inspected November 2024
- Type
- Arch - Deck
- Concrete
- Length
- 69 ft
- 1 main span
- Daily traffic
- 2,784
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 3 over Lost River is a concrete arch - deck carrying US 3 over Lost River in Grafton County, New Hampshire. It was built in 1931, so it is 94 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 2,784 vehicles a day, roughly 4% of them trucks, projected to reach 4,120 by 2043. The structure is 69 ft (21 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 3 over Lost River built?
It was built in 1931, making it 94 years old in 2025.
What condition is US 3 over Lost River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.
How much traffic does US 3 over Lost River carry?
About 2,784 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is US 3 over Lost River?
The structure is 69 ft (21 m) long with a longest span of 69 ft (21 m) and a deck 32 ft wide.
Who owns US 3 over Lost River?
It is owned by the State Highway Agency.