NH104 over Smith River
PoorMerrimack County, New Hampshire · 1.0 MI from Hill Tl · Structure no. 005801390014500
- Built
- 1940
- 85 years old, rebuilt 1991
- Condition
- Poor
- inspected November 2024
- Type
- Girder and Floorbeam System
- Steel
- Length
- 106 ft
- 1 main span
- Daily traffic
- 2,913
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
NH104 over Smith River is a steel girder and floorbeam system carrying NH104 over Smith River in Merrimack County, New Hampshire. It was built in 1940 and reconstructed in 1991, 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 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 2,913 vehicles a day, roughly 7% of them trucks, projected to reach 4,311 by 2043. The structure is 106 ft (32.3 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was NH104 over Smith River built?
It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1991.
What condition is NH104 over Smith 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 NH104 over Smith River carry?
About 2,913 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is NH104 over Smith River?
The structure is 106 ft (32.3 m) long with a longest span of 96 ft (29.3 m) and a deck 31 ft wide.
Who owns NH104 over Smith River?
It is owned by the State Highway Agency.