US Bridges

Thornton Road over I-20 & I-20 Ramp

Fair

Douglas County, Georgia · 8.3 MI E of Douglasville · Structure no. 000000009700050

Built
1963
62 years old, rebuilt 1990
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
302 ft
4 main spans
Daily traffic
20,251
2024 count
Owner
State
State Highway Agency

About this bridge

Thornton Road over I-20 & I-20 Ramp is a steel continuous stringer/multi-beam or girder carrying Thornton Road over I-20 & I-20 Ramp in Douglas County, Georgia. It was built in 1963 and reconstructed in 1990, so it is 62 years old, older 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 20,251 vehicles a day, roughly 1% of them trucks, projected to reach 89,100 by 2032. The structure is 302 ft (92 m) long and 102 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesThornton Road
CrossesI-20 & I-20 Ramp
Location8.3 MI E of Douglasville
RouteState Highway 6
StateGeorgia
Coordinates33.7769, -84.60561
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating34.9 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length302 ft (92 m)
Longest span84 ft (25.6 m)
Deck width102 ft (31.2 m)
Roadway width88 ft (26.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,251 (2024)
Projected traffic89,100 by 2032
Trucks1%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 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$4.2 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Thornton Road over I-20 & I-20 Ramp built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1990.

What condition is Thornton Road over I-20 & I-20 Ramp 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 November 2023.

How much traffic does Thornton Road over I-20 & I-20 Ramp carry?

About 20,251 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Thornton Road over I-20 & I-20 Ramp?

The structure is 302 ft (92 m) long with a longest span of 84 ft (25.6 m) and a deck 102 ft wide.

Who owns Thornton Road over I-20 & I-20 Ramp?

It is owned by the State Highway Agency.