US Bridges

Rock Road over Bayou Jonas

Fair

Mobile County, Alabama · 2.9 MI E Henley RD · Structure no. 007590

Built
1992
33 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete
Length
72 ft
9 main spans
Daily traffic
129
2024 count
Owner
County
County Highway Agency

About this bridge

Rock Road over Bayou Jonas is a concrete culvert carrying Rock Road over Bayou Jonas in Mobile County, Alabama. It was built in 1992, so it is 33 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 129 vehicles a day, roughly 9% of them trucks, projected to reach 192 by 2044. The structure is 72 ft (21.9 m) long. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesRock Road
CrossesBayou Jonas
Location2.9 MI E Henley RD
RouteCounty Highway 0
CountyMobile County
StateAlabama
Coordinates30.39826, -88.18259
Functional classRural Local

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.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans9
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span7 ft (2.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic129 (2024)
Projected traffic192 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$1.3 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rock Road over Bayou Jonas built?

It was built in 1992, making it 33 years old in 2025.

What condition is Rock Road over Bayou Jonas 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 March 2024.

How much traffic does Rock Road over Bayou Jonas carry?

About 129 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Rock Road over Bayou Jonas?

The structure is 72 ft (21.9 m) long with a longest span of 7 ft (2.2 m).

Who owns Rock Road over Bayou Jonas?

It is owned by the County Highway Agency.