US Bridges

I-10 over Farmer Branch

Fair

Mobile County, Alabama · 5.6 MI E Miss ST Line · Structure no. 008121

Built
1964
61 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
50,787
2022 count
Owner
State
State Highway Agency

About this bridge

I-10 over Farmer Branch is a concrete culvert carrying I-10 over Farmer Branch in Mobile County, Alabama. It was built in 1964, so it is 61 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 5 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 50,787 vehicles a day, roughly 28% of them trucks, projected to reach 76,181 by 2042. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesI-10
CrossesFarmer Branch
Location5.6 MI E Miss ST Line
RouteInterstate 10
CountyMobile County
StateAlabama
Coordinates30.50173, -88.31082
Functional classRural 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.8 US tons
Inventory rating35.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 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 traffic50,787 (2022)
Projected traffic76,181 by 2042
Trucks28%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.7 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-10 over Farmer Branch built?

It was built in 1964, making it 61 years old in 2025.

What condition is I-10 over Farmer Branch 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 November 2023.

How much traffic does I-10 over Farmer Branch carry?

About 50,787 vehicles per day (2022 count), of which roughly 28% are trucks.

How long is I-10 over Farmer Branch?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns I-10 over Farmer Branch?

It is owned by the State Highway Agency.