US Bridges

Ramp on US 17 SB over US 17 NB

Good

Charleston County, South Carolina · Mt Pleasant · Structure no. 000000000009830

Built
2005
20 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,275 ft
2 main spans
Daily traffic
18,750
2023 count
Owner
State
State Highway Agency

About this bridge

Ramp on US 17 SB over US 17 NB is a steel continuous stringer/multi-beam or girder carrying Ramp on US 17 SB over US 17 NB 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 18,750 vehicles a day, roughly 2% of them trucks, projected to reach 26,813 by 2043. The structure is 1,275 ft (388.6 m) long and 39 ft wide.

Location

Open in Google Maps
CarriesRamp on US 17 SB
CrossesUS 17 NB
LocationMt Pleasant
RouteU.S. Route 703
CountyCharleston County
StateSouth Carolina
Coordinates32.80091, -79.90065
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating22.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+5 approach)
Design loadHS 25 or greater
Structure length1,275 ft (388.6 m)
Longest span210 ft (64 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,750 (2023)
Projected traffic26,813 by 2043
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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$2.9 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp on US 17 SB over US 17 NB built?

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

What condition is Ramp on US 17 SB over US 17 NB 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 SB over US 17 NB carry?

About 18,750 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Ramp on US 17 SB over US 17 NB?

The structure is 1,275 ft (388.6 m) long with a longest span of 210 ft (64 m) and a deck 39 ft wide.

Who owns Ramp on US 17 SB over US 17 NB?

It is owned by the State Highway Agency.