US Bridges

SR 20 over I-75

Fair

Henry County, Georgia · 2 MI SW of Mcdonough · Structure no. 000000015150630

Built
1999
26 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
308 ft
4 main spans
Daily traffic
25,500
2024 count
Owner
State
State Highway Agency

About this bridge

SR 20 over I-75 is a prestressed concrete stringer/multi-beam or girder carrying SR 20 over I-75 in Henry County, Georgia. It was built in 1999, so it is 26 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 25,500 vehicles a day, roughly 1% of them trucks, projected to reach 35,070 by 2031. The structure is 308 ft (93.9 m) long and 102 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSR 20
CrossesI-75
Location2 MI SW of Mcdonough
RouteState Highway 20
StateGeorgia
Coordinates33.42739, -84.18159
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2024
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 alignment6: Equal to present minimum criteria
Operating rating66.9 US tons
Inventory rating39.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length308 ft (93.9 m)
Longest span107 ft (32.6 m)
Deck width102 ft (31.2 m)
Roadway width89 ft (27 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,500 (2024)
Projected traffic35,070 by 2031
Trucks1%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.7 mi (6 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$4.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 20 over I-75 built?

It was built in 1999, making it 26 years old in 2025.

What condition is SR 20 over I-75 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 2024.

How much traffic does SR 20 over I-75 carry?

About 25,500 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is SR 20 over I-75?

The structure is 308 ft (93.9 m) long with a longest span of 107 ft (32.6 m) and a deck 102 ft wide.

Who owns SR 20 over I-75?

It is owned by the State Highway Agency.