US Bridges

SR 163 over Robinson Bayou

Fair

Mobile County, Alabama · 1.8 MI S I-10 · Structure no. 007492

Built
1961
64 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
24,334
2021 count
Owner
State
State Highway Agency

About this bridge

SR 163 over Robinson Bayou is a concrete culvert carrying SR 163 over Robinson Bayou in Mobile County, Alabama. It was built in 1961, so it is 64 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 24,334 vehicles a day, roughly 2% of them trucks, projected to reach 36,501 by 2041. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 21.1 mi (34 km).

Location

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CarriesSR 163
CrossesRobinson Bayou
Location1.8 MI S I-10
RouteState Highway 163
CountyMobile County
StateAlabama
Coordinates30.5531, -88.0998
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating98 US tons
Inventory rating65.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 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 traffic24,334 (2021)
Projected traffic36,501 by 2041
Trucks2%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 163 over Robinson Bayou built?

It was built in 1961, making it 64 years old in 2025.

What condition is SR 163 over Robinson 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 163 over Robinson Bayou carry?

About 24,334 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is SR 163 over Robinson Bayou?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).

Who owns SR 163 over Robinson Bayou?

It is owned by the State Highway Agency.