US Bridges

US 17 NB over RR CSXT

Fair

Charleston County, South Carolina · 5 MI S of Charleston · Structure no. 000000000001603

Built
1957
68 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
165 ft
3 main spans
Daily traffic
25,250
2023 count
Owner
State
State Highway Agency

About this bridge

US 17 NB over RR CSXT is a steel stringer/multi-beam or girder carrying US 17 NB over RR CSXT in Charleston County, South Carolina. It was built in 1957, so it is 68 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 25,250 vehicles a day, roughly 9% of them trucks, projected to reach 36,108 by 2043. The structure is 165 ft (50.3 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 17 NB
CrossesRR CSXT
Location5 MI S of Charleston
RouteU.S. Route 17
CountyCharleston County
StateSouth Carolina
Coordinates32.80075, -80.09827
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.8 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length165 ft (50.3 m)
Longest span55 ft (16.8 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,250 (2023)
Projected traffic36,108 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$750,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 17 NB over RR CSXT built?

It was built in 1957, making it 68 years old in 2025.

What condition is US 17 NB over RR CSXT in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does US 17 NB over RR CSXT carry?

About 25,250 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is US 17 NB over RR CSXT?

The structure is 165 ft (50.3 m) long with a longest span of 55 ft (16.8 m) and a deck 34 ft wide.

Who owns US 17 NB over RR CSXT?

It is owned by the State Highway Agency.