US Bridges

Ramp on US 17 NB over Johnson ST & RR CSXT

Good

Charleston County, South Carolina · In Charleston · Structure no. 000000000005478

Built
2005
20 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
2,132 ft
10 main spans
Daily traffic
6,300
2015 count
Owner
State
State Highway Agency

About this bridge

Ramp on US 17 NB over Johnson ST & RR CSXT is a steel continuous stringer/multi-beam or girder carrying Ramp on US 17 NB over Johnson ST & RR CSXT in Charleston County, South Carolina. It was built in 2005, so it is 20 years old, younger than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,300 vehicles a day, projected to reach 9,387 by 2035. The structure is 2,132 ft (649.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRamp on US 17 NB
CrossesJohnson ST & RR CSXT
LocationIn Charleston
RouteU.S. Route 17
CountyCharleston County
StateSouth Carolina
Coordinates32.80297, -79.93666
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans10 (+12 approach)
Design loadHS 25 or greater
Structure length2,132 ft (649.8 m)
Longest span190 ft (57.9 m)
Deck width43 ft (13.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,300 (2015)
Projected traffic9,387 by 2035
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp on US 17 NB over Johnson ST & RR CSXT built?

It was built in 2005, making it 20 years old in 2025.

What condition is Ramp on US 17 NB over Johnson ST & RR CSXT in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does Ramp on US 17 NB over Johnson ST & RR CSXT carry?

About 6,300 vehicles per day (2015 count).

How long is Ramp on US 17 NB over Johnson ST & RR CSXT?

The structure is 2,132 ft (649.8 m) long with a longest span of 190 ft (57.9 m) and a deck 43 ft wide.

Who owns Ramp on US 17 NB over Johnson ST & RR CSXT?

It is owned by the State Highway Agency.