US Bridges

SR 193 over Alligator Bayou

Fair

Mobile County, Alabama · 0.2 MI N Hamilton Blvd · Structure no. 012836

Built
1979
46 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
35 ft
2 main spans
Daily traffic
15,423
2023 count
Owner
State
State Highway Agency

About this bridge

SR 193 over Alligator Bayou is a concrete culvert carrying SR 193 over Alligator Bayou in Mobile County, Alabama. It was built in 1979, so it is 46 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 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 15,423 vehicles a day, roughly 7% of them trucks, projected to reach 23,134 by 2043. The structure is 35 ft (10.7 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSR 193
CrossesAlligator Bayou
Location0.2 MI N Hamilton Blvd
RouteState Highway 193
CountyMobile County
StateAlabama
Coordinates30.55464, -88.12347
Functional classUrban Other Principal Arterial

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 inspectionOctober 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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating98 US tons
Inventory rating98 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,423 (2023)
Projected traffic23,134 by 2043
Trucks7%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$6.6 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 193 over Alligator Bayou built?

It was built in 1979, making it 46 years old in 2025.

What condition is SR 193 over Alligator Bayou 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 October 2024.

How much traffic does SR 193 over Alligator Bayou carry?

About 15,423 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is SR 193 over Alligator Bayou?

The structure is 35 ft (10.7 m) long with a longest span of 8 ft (2.4 m).

Who owns SR 193 over Alligator Bayou?

It is owned by the State Highway Agency.