I-89 over South Street
PoorMerrimack County, New Hampshire · Bow Interchange · Structure no. 002701320016000
- Built
- 1959
- 66 years old
- Condition
- Poor
- inspected November 2024
- Type
- Frame
- Concrete
- Length
- 55 ft
- 1 main span
- Daily traffic
- 46,612
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-89 over South Street is a concrete frame carrying I-89 over South Street in Merrimack County, New Hampshire. It was built in 1959, so it is 66 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 46,612 vehicles a day, roughly 6% of them trucks, projected to reach 68,985 by 2043. The structure is 55 ft (16.8 m) long and 101 ft wide. If it were closed, the detour would be 11.2 mi (18 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-89 over South Street built?
It was built in 1959, making it 66 years old in 2025.
What condition is I-89 over South Street 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 I-89 over South Street carry?
About 46,612 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is I-89 over South Street?
The structure is 55 ft (16.8 m) long with a longest span of 51 ft (15.5 m) and a deck 101 ft wide.
Who owns I-89 over South Street?
It is owned by the State Highway Agency.