US Bridges

SR 120 Loop over Rottenwood Creek Trib.

Good

Cobb County, Georgia · In SE Marietta · Structure no. 000000006701820

Built
1969
56 years old, rebuilt 1989
Condition
Good
inspected May 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
48,100
2024 count
Owner
State
State Highway Agency

About this bridge

SR 120 Loop over Rottenwood Creek Trib. is a concrete culvert carrying SR 120 Loop over Rottenwood Creek Trib. in Cobb County, Georgia. It was built in 1969 and reconstructed in 1989, so it is 56 years old, older 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 48,100 vehicles a day, roughly 1% of them trucks, projected to reach 67,800 by 2032. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR 120 Loop
CrossesRottenwood Creek Trib.
LocationIn SE Marietta
RouteState Highway 120
StateGeorgia
Coordinates33.94218, -84.50201
Functional classUrban 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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic48,100 (2024)
Projected traffic67,800 by 2032
Trucks1%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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$324,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 120 Loop over Rottenwood Creek Trib. built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 1989.

What condition is SR 120 Loop over Rottenwood Creek Trib. 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 May 2023.

How much traffic does SR 120 Loop over Rottenwood Creek Trib. carry?

About 48,100 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is SR 120 Loop over Rottenwood Creek Trib.?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns SR 120 Loop over Rottenwood Creek Trib.?

It is owned by the State Highway Agency.