US Bridges

US 78 SR 10 SR 1 over I-20

Good

McDuffie County, Georgia · 3.8 MI NE of Thomson · Structure no. 000000018950200

Built
2010
15 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
346 ft
4 main spans
Daily traffic
3,790
2024 count
Owner
State
State Highway Agency

About this bridge

US 78 SR 10 SR 1 over I-20 is a prestressed concrete stringer/multi-beam or girder carrying US 78 SR 10 SR 1 over I-20 in McDuffie County, Georgia. It was built in 2010, so it is 15 years old, younger than the Georgia average of 47.5 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 3,790 vehicles a day, roughly 1% of them trucks, projected to reach 6,225 by 2031. The structure is 346 ft (105.5 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 78 SR 10 SR 1
CrossesI-20
Location3.8 MI NE of Thomson
RouteU.S. Route 78
StateGeorgia
Coordinates33.512, -82.49852
Functional classRural Minor 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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.9 US tons
Inventory rating35.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length346 ft (105.5 m)
Longest span128 ft (39 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,790 (2024)
Projected traffic6,225 by 2031
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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$2 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 78 SR 10 SR 1 over I-20 built?

It was built in 2010, making it 15 years old in 2025.

What condition is US 78 SR 10 SR 1 over I-20 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 January 2025.

How much traffic does US 78 SR 10 SR 1 over I-20 carry?

About 3,790 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is US 78 SR 10 SR 1 over I-20?

The structure is 346 ft (105.5 m) long with a longest span of 128 ft (39 m) and a deck 41 ft wide.

Who owns US 78 SR 10 SR 1 over I-20?

It is owned by the State Highway Agency.