US Bridges

Sc 170/FREEDOM Pky over Mongon Swamp

Fair

Jasper County, South Carolina · 4.6MI S of Hardeeville · Structure no. 000000000001725

Built
1950
75 years old, rebuilt 1976
Condition
Fair
inspected December 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
3,400
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 170/FREEDOM Pky over Mongon Swamp is a concrete culvert carrying Sc 170/FREEDOM Pky over Mongon Swamp in Jasper County, South Carolina. It was built in 1950 and reconstructed in 1976, so it is 75 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 3,400 vehicles a day, roughly 8% of them trucks, projected to reach 3,808 by 2043. The structure is 21 ft (6.4 m) long and 51 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSc 170/FREEDOM Pky
CrossesMongon Swamp
Location4.6MI S of Hardeeville
RouteState Highway 170
CountyJasper County
StateSouth Carolina
Coordinates32.22189, -81.04714
Functional classUrban Minor 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width51 ft (15.5 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,400 (2023)
Projected traffic3,808 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sc 170/FREEDOM Pky over Mongon Swamp built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1976.

What condition is Sc 170/FREEDOM Pky over Mongon Swamp 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 December 2023.

How much traffic does Sc 170/FREEDOM Pky over Mongon Swamp carry?

About 3,400 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Sc 170/FREEDOM Pky over Mongon Swamp?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 51 ft wide.

Who owns Sc 170/FREEDOM Pky over Mongon Swamp?

It is owned by the State Highway Agency.