US Bridges

I - 20/59 South over Dolonah Road

Fair

Jefferson County, Alabama · I59 * Dolonah Road · Structure no. 011749

Built
1977
48 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
545 ft
7 main spans
Daily traffic
31,758
2022 count
Owner
State
State Highway Agency

About this bridge

I - 20/59 South over Dolonah Road is a steel continuous stringer/multi-beam or girder carrying I - 20/59 South over Dolonah Road in Jefferson County, Alabama. It was built in 1977, so it is 48 years old, younger 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 31,758 vehicles a day, roughly 18% of them trucks, projected to reach 47,637 by 2042. The structure is 545 ft (166.1 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI - 20/59 South
CrossesDolonah Road
LocationI59 * Dolonah Road
RouteInterstate 20
CountyJefferson County
StateAlabama
Coordinates33.39528, -86.98278
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.4 US tons
Inventory rating31.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length545 ft (166.1 m)
Longest span91 ft (27.8 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,758 (2022)
Projected traffic47,637 by 2042
Trucks18%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$5.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I - 20/59 South over Dolonah Road built?

It was built in 1977, making it 48 years old in 2025.

What condition is I - 20/59 South over Dolonah Road 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 August 2023.

How much traffic does I - 20/59 South over Dolonah Road carry?

About 31,758 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is I - 20/59 South over Dolonah Road?

The structure is 545 ft (166.1 m) long with a longest span of 91 ft (27.8 m) and a deck 42 ft wide.

Who owns I - 20/59 South over Dolonah Road?

It is owned by the State Highway Agency.