US Bridges

Knight Avenue over Birmingham Sou RR

Good

Jefferson County, Alabama · Knight Ave * Birm Sou RR · Structure no. 016641

Built
1999
26 years old
Condition
Good
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
107 ft
1 main span
Daily traffic
1,200
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Knight Avenue over Birmingham Sou RR is a prestressed concrete box beam or girders - multiple carrying Knight Avenue over Birmingham Sou RR in Jefferson County, Alabama. It was built in 1999, so it is 26 years old, younger than the Alabama average of 51.1 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 1,200 vehicles a day, roughly 1% of them trucks, projected to reach 1,680 by 2044. The structure is 107 ft (32.6 m) long and 32 ft wide.

CarriesKnight Avenue
CrossesBirmingham Sou RR
LocationKnight Ave * Birm Sou RR
RouteCity Street 0
StateAlabama
Coordinates33.45839, -86.97983
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating70.2 US tons
Inventory rating31.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1 (+2 approach)
Design loadHS 20
Structure length107 ft (32.6 m)
Longest span63 ft (19.2 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9 m)
Vertical clearance over deck25 ft (7.6 m)

Traffic and service

Average daily traffic1,200 (2024)
Projected traffic1,680 by 2044
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$998,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Knight Avenue over Birmingham Sou RR built?

It was built in 1999, making it 26 years old in 2025.

What condition is Knight Avenue over Birmingham Sou RR 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 November 2024.

How much traffic does Knight Avenue over Birmingham Sou RR carry?

About 1,200 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Knight Avenue over Birmingham Sou RR?

The structure is 107 ft (32.6 m) long with a longest span of 63 ft (19.2 m) and a deck 32 ft wide.

Who owns Knight Avenue over Birmingham Sou RR?

It is owned by the City or Municipal Highway Agency.