US Bridges

Mobile Street over Nall St. Drainage Canal

Fair

Mobile County, Alabama · 0.4M N of Spring Hill · Structure no. 018800

Built
1987
38 years old, rebuilt 2001
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
44 ft
2 main spans
Daily traffic
12,663
2024 count
Owner
City
City or Municipal Highway Agency

About this bridge

Mobile Street over Nall St. Drainage Canal is a concrete culvert carrying Mobile Street over Nall St. Drainage Canal in Mobile County, Alabama. It was built in 1987 and reconstructed in 2001, so it is 38 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 12,663 vehicles a day, roughly 2% of them trucks, projected to reach 18,994 by 2044. The structure is 44 ft (13.4 m) long and 32 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesMobile Street
CrossesNall St. Drainage Canal
Location0.4M N of Spring Hill
RouteCity Street 0
CountyMobile County
StateAlabama
Coordinates30.70316, -88.10296
Functional classUrban 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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating78.8 US tons
Inventory rating47.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span12 ft (3.7 m)
Deck width32 ft (9.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,663 (2024)
Projected traffic18,994 by 2044
Trucks2%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.1 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mobile Street over Nall St. Drainage Canal built?

It was built in 1987, making it 38 years old in 2025. It was reconstructed in 2001.

What condition is Mobile Street over Nall St. Drainage Canal 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 January 2024.

How much traffic does Mobile Street over Nall St. Drainage Canal carry?

About 12,663 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is Mobile Street over Nall St. Drainage Canal?

The structure is 44 ft (13.4 m) long with a longest span of 12 ft (3.7 m) and a deck 32 ft wide.

Who owns Mobile Street over Nall St. Drainage Canal?

It is owned by the City or Municipal Highway Agency.