US Bridges

ST Clair CO HWY 6 over Big Black Creek

Fair

St. Clair County, Alabama · 1 0 SW Margaret · Structure no. 005579

Built
1956
69 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete Continuous
Length
54 ft
5 main spans
Daily traffic
3,373
2006 count
Owner
County
County Highway Agency

About this bridge

ST Clair CO HWY 6 over Big Black Creek is a concrete continuous culvert carrying ST Clair CO HWY 6 over Big Black Creek in St. Clair County, Alabama. It was built in 1956, so it is 69 years old, older than the Alabama average of 51.1 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 3,373 vehicles a day, roughly 4% of them trucks, projected to reach 5,319 by 2029. The structure is 54 ft (16.5 m) long and 49 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesST Clair CO HWY 6
CrossesBig Black Creek
Location1 0 SW Margaret
RouteCounty Highway 50
CountySt. Clair County
StateAlabama
Coordinates33.67485, -86.49339
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating41.3 US tons
Inventory rating24.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 15
Structure length54 ft (16.5 m)
Longest span10 ft (3 m)
Deck width49 ft (14.8 m)
Roadway width49 ft (14.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,373 (2006)
Projected traffic5,319 by 2029
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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$728,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was ST Clair CO HWY 6 over Big Black Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is ST Clair CO HWY 6 over Big Black Creek 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 February 2025.

How much traffic does ST Clair CO HWY 6 over Big Black Creek carry?

About 3,373 vehicles per day (2006 count), of which roughly 4% are trucks.

How long is ST Clair CO HWY 6 over Big Black Creek?

The structure is 54 ft (16.5 m) long with a longest span of 10 ft (3 m) and a deck 49 ft wide.

Who owns ST Clair CO HWY 6 over Big Black Creek?

It is owned by the County Highway Agency.