US Bridges

Columbia Nitrogen over Unknown Creek

Good

Richmond County, Georgia · 12.1 MI NE of Hephzibah · Structure no. 000000024550670

Built
2001
24 years old
Condition
Good
inspected December 2023
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
790
2024 count
Owner
County
County Highway Agency

About this bridge

Columbia Nitrogen over Unknown Creek is a concrete culvert carrying Columbia Nitrogen over Unknown Creek in Richmond County, Georgia. It was built in 2001, so it is 24 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 790 vehicles a day, roughly 1% of them trucks, projected to reach 1,920 by 2032. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesColumbia Nitrogen
CrossesUnknown Creek
Location12.1 MI NE of Hephzibah
RouteCounty Highway 683
StateGeorgia
Coordinates33.43324, -81.9385
Functional classUrban Local

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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating35.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length22 ft (6.7 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 traffic790 (2024)
Projected traffic1,920 by 2032
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$129,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Columbia Nitrogen over Unknown Creek built?

It was built in 2001, making it 24 years old in 2025.

What condition is Columbia Nitrogen over Unknown Creek 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 December 2023.

How much traffic does Columbia Nitrogen over Unknown Creek carry?

About 790 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Columbia Nitrogen over Unknown Creek?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns Columbia Nitrogen over Unknown Creek?

It is owned by the County Highway Agency.