US Bridges

Mills Road over Big Slough

Good

Decatur County, Georgia · 3.4 MI NE of Bainbridge · Structure no. 000000008750490

Built
1980
45 years old
Condition
Good
inspected October 2023
Type
Slab
Concrete
Length
160 ft
8 main spans
Daily traffic
430
2024 count
Owner
County
County Highway Agency

About this bridge

Mills Road over Big Slough is a concrete slab carrying Mills Road over Big Slough in Decatur County, Georgia. It was built in 1980, so it is 45 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 430 vehicles a day, roughly 1% of them trucks, projected to reach 735 by 2032. The structure is 160 ft (48.8 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesMills Road
CrossesBig Slough
Location3.4 MI NE of Bainbridge
RouteCounty Highway 318
StateGeorgia
Coordinates30.93738, -84.53033
Functional classRural Local

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.9 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans8
Design loadHS 15
Structure length160 ft (48.8 m)
Longest span20 ft (6.1 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic430 (2024)
Projected traffic735 by 2032
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$938,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Mills Road over Big Slough built?

It was built in 1980, making it 45 years old in 2025.

What condition is Mills Road over Big Slough 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 October 2023.

How much traffic does Mills Road over Big Slough carry?

About 430 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Mills Road over Big Slough?

The structure is 160 ft (48.8 m) long with a longest span of 20 ft (6.1 m) and a deck 35 ft wide.

Who owns Mills Road over Big Slough?

It is owned by the County Highway Agency.