US Bridges

US 78 SR 10 SR 1 over I-20

Fair

McDuffie County, Georgia · 3.8 MI NE of Thomson · Structure no. 000000018950190

Built
2010
15 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
346 ft
4 main spans
Daily traffic
45,400
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 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 45,400 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
Coordinates33.51188, -82.49824
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to 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 traffic45,400 (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
NavigationNo navigation control on 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 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 January 2025.

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

About 45,400 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.