US Bridges

Sigman Road over I-20

Good

Rockdale County, Georgia · 2 MI NW of Conyers · Structure no. 000000024700230

Built
1992
33 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
194 ft
2 main spans
Daily traffic
20,251
2024 count
Owner
State
State Highway Agency

About this bridge

Sigman Road over I-20 is a prestressed concrete stringer/multi-beam or girder carrying Sigman Road over I-20 in Rockdale County, Georgia. It was built in 1992, so it is 33 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 20,251 vehicles a day, roughly 1% of them trucks, projected to reach 1,965 by 2032. The structure is 194 ft (59.1 m) long and 91 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesSigman Road
CrossesI-20
Location2 MI NW of Conyers
RouteCounty Highway 9335
StateGeorgia
Coordinates33.68306, -84.06372
Functional classUrban Other Principal 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.9 US tons
Inventory rating38.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length194 ft (59.1 m)
Longest span97 ft (29.6 m)
Deck width91 ft (27.6 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,251 (2024)
Projected traffic1,965 by 2032
Trucks1%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed8.1 mi (13 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$2.4 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Sigman Road over I-20 built?

It was built in 1992, making it 33 years old in 2025.

What condition is Sigman Road 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 April 2023.

How much traffic does Sigman Road over I-20 carry?

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

How long is Sigman Road over I-20?

The structure is 194 ft (59.1 m) long with a longest span of 97 ft (29.6 m) and a deck 91 ft wide.

Who owns Sigman Road over I-20?

It is owned by the State Highway Agency.