Nh 9(LOUDON Road) over Merrimack River
PoorMerrimack County, New Hampshire · 0.1 MI East JCT I-93 · Structure no. 005201630011100
- Built
- 1966
- 59 years old, rebuilt 1996
- Condition
- Poor
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 525 ft
- 4 main spans
- Daily traffic
- 23,721
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Nh 9(LOUDON Road) over Merrimack River is a steel continuous stringer/multi-beam or girder carrying Nh 9(LOUDON Road) over Merrimack River in Merrimack County, New Hampshire. It was built in 1966 and reconstructed in 1996, so it is 59 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 3 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 23,721 vehicles a day, roughly 4% of them trucks, projected to reach 35,107 by 2043. The structure is 525 ft (160 m) long and 77 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Nh 9(LOUDON Road) over Merrimack River built?
It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1996.
What condition is Nh 9(LOUDON Road) over Merrimack 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 Nh 9(LOUDON Road) over Merrimack River carry?
About 23,721 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Nh 9(LOUDON Road) over Merrimack River?
The structure is 525 ft (160 m) long with a longest span of 144 ft (43.9 m) and a deck 77 ft wide.
Who owns Nh 9(LOUDON Road) over Merrimack River?
It is owned by the City or Municipal Highway Agency.