US 17 Alt over Combahee River
PoorColleton County, South Carolina · Hamp/Coll CO LN · Structure no. 000000000001026
- Built
- 1940
- 85 years old
- Condition
- Poor
- inspected February 2025
- Type
- Tee Beam
- Concrete
- Length
- 810 ft
- 27 main spans
- Daily traffic
- 1,350
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 17 Alt over Combahee River is a concrete tee beam carrying US 17 Alt over Combahee River in Colleton County, South Carolina. It was built in 1940, so it is 85 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 1,350 vehicles a day, roughly 16% of them trucks, projected to reach 2,147 by 2043. The structure is 810 ft (246.9 m) long and 28 ft wide.
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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 17 Alt over Combahee River built?
It was built in 1940, making it 85 years old in 2025.
What condition is US 17 Alt over Combahee 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 February 2025.
How much traffic does US 17 Alt over Combahee River carry?
About 1,350 vehicles per day (2023 count), of which roughly 16% are trucks.
How long is US 17 Alt over Combahee River?
The structure is 810 ft (246.9 m) long with a longest span of 30 ft (9.1 m) and a deck 28 ft wide.
Who owns US 17 Alt over Combahee River?
It is owned by the State Highway Agency.