US Bridges

I-10 over Rattlesnake Branch

Fair

Mobile County, Alabama · 0.4 MI E US 90 · Structure no. 008137

Built
1964
61 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete
Length
37 ft
3 main spans
Daily traffic
72,338
2020 count
Owner
State
State Highway Agency

About this bridge

I-10 over Rattlesnake Branch is a concrete culvert carrying I-10 over Rattlesnake 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 72,338 vehicles a day, roughly 18% of them trucks, projected to reach 108,507 by 2040. The structure is 37 ft (11.3 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesI-10
CrossesRattlesnake Branch
Location0.4 MI E US 90
RouteInterstate 10
CountyMobile County
StateAlabama
Coordinates30.58378, -88.16502
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98 US tons
Inventory rating98 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic72,338 (2020)
Projected traffic108,507 by 2040
Trucks18%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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$1.9 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-10 over Rattlesnake Branch built?

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

What condition is I-10 over Rattlesnake 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 Rattlesnake Branch carry?

About 72,338 vehicles per day (2020 count), of which roughly 18% are trucks.

How long is I-10 over Rattlesnake Branch?

The structure is 37 ft (11.3 m) long with a longest span of 12 ft (3.7 m).

Who owns I-10 over Rattlesnake Branch?

It is owned by the State Highway Agency.