US 17 NB over Ashley River
PoorCharleston County, South Carolina · In Charleston · Structure no. 000000000003607
- Built
- 1961
- 64 years old
- Condition
- Poor
- inspected November 2024
- Type
- Movable - Bascule
- Steel
- Length
- 1,634 ft
- 1 main span
- Daily traffic
- 38,250
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 17 NB over Ashley River is a steel movable - bascule carrying US 17 NB over Ashley River in Charleston County, South Carolina. It was built in 1961, so it is 64 years old, older than the South Carolina average of 48 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 38,250 vehicles a day, roughly 2% of them trucks, projected to reach 54,698 by 2043. The structure is 1,634 ft (498 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 17 NB over Ashley River built?
It was built in 1961, making it 64 years old in 2025.
What condition is US 17 NB over Ashley 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 17 NB over Ashley River carry?
About 38,250 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is US 17 NB over Ashley River?
The structure is 1,634 ft (498 m) long with a longest span of 236 ft (71.9 m) and a deck 47 ft wide.
Who owns US 17 NB over Ashley River?
It is owned by the State Highway Agency.