US Bridges

US 301 over Agnay Swamp

Poor

Marion County, South Carolina · 3 MI N of Pee Dee · Structure no. 000000000000046

Built
1930
95 years old, rebuilt 1945
Condition
Poor
inspected June 2024
Type
Culvert
Concrete Continuous
Length
32 ft
3 main spans
Daily traffic
3,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 301 over Agnay Swamp is a concrete continuous culvert carrying US 301 over Agnay Swamp in Marion County, South Carolina. It was built in 1930 and reconstructed in 1945, so it is 95 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 3,000 vehicles a day, roughly 14% of them trucks, projected to reach 4,380 by 2043. The structure is 32 ft (9.8 m) long and 74 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 301
CrossesAgnay Swamp
Location3 MI N of Pee Dee
RouteU.S. Route 301
CountyMarion County
StateSouth Carolina
Coordinates34.21724, -79.51443
Functional classRural Major Collector

Condition and inspection

Poor

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.

ComponentRatingMeaning
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating24.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width74 ft (22.6 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2023)
Projected traffic4,380 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$69,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 301 over Agnay Swamp built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1945.

What condition is US 301 over Agnay Swamp 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 June 2024.

How much traffic does US 301 over Agnay Swamp carry?

About 3,000 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is US 301 over Agnay Swamp?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m) and a deck 74 ft wide.

Who owns US 301 over Agnay Swamp?

It is owned by the State Highway Agency.