US Bridges

County 3 over Cahaba River

Fair

Bibb County, Alabama · 2.2MI E Harrisburg CO.3 · Structure no. 007615

Built
1962
63 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
601 ft
3 main spans
Daily traffic
50
1989 count
Owner
County
County Highway Agency

About this bridge

County 3 over Cahaba River is a steel continuous stringer/multi-beam or girder carrying County 3 over Cahaba River in Bibb County, Alabama. It was built in 1962, so it is 63 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 50 vehicles a day, projected to reach 75 by 2034. The structure is 601 ft (183.2 m) long and 29 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesCounty 3
CrossesCahaba River
Location2.2MI E Harrisburg CO.3
RouteCounty Highway 3
CountyBibb County
StateAlabama
Coordinates32.85552, -87.19866
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating41 US tons
Inventory rating22.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+10 approach)
Design loadH 15
Structure length601 ft (183.2 m)
Longest span100 ft (30.5 m)
Deck width29 ft (8.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (1989)
Projected traffic75 by 2034
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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$4.2 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County 3 over Cahaba River built?

It was built in 1962, making it 63 years old in 2025.

What condition is County 3 over Cahaba River 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 December 2024.

How much traffic does County 3 over Cahaba River carry?

About 50 vehicles per day (1989 count).

How long is County 3 over Cahaba River?

The structure is 601 ft (183.2 m) long with a longest span of 100 ft (30.5 m) and a deck 29 ft wide.

Who owns County 3 over Cahaba River?

It is owned by the County Highway Agency.