US Bridges

I-10 EB over Mobile Bay * US 90

Fair

Mobile County, Alabama · East Tunnel Interchange · Structure no. 011931

Built
1978
47 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
39,728 ft
2 main spans
Daily traffic
32,384
2022 count
Owner
State
State Highway Agency

About this bridge

I-10 EB over Mobile Bay * US 90 is a steel continuous stringer/multi-beam or girder carrying I-10 EB over Mobile Bay * US 90 in Mobile County, Alabama. It was built in 1978, so it is 47 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 32,384 vehicles a day, roughly 15% of them trucks, projected to reach 48,581 by 2042. The structure is 39,728 ft (12,109.1 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-10 EB
CrossesMobile Bay * US 90
LocationEast Tunnel Interchange
RouteInterstate 10
CountyMobile County
StateAlabama
Coordinates30.69185, -88.02888
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating40.3 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, precast panels
Main spans2 (+610 approach)
Design loadHS 20
Structure length39,728 ft (12,109.1 m)
Longest span154 ft (46.9 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,384 (2022)
Projected traffic48,581 by 2042
Trucks15%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$383.6 million (2025 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I-10 EB over Mobile Bay * US 90 built?

It was built in 1978, making it 47 years old in 2025.

What condition is I-10 EB over Mobile Bay * US 90 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 August 2023.

How much traffic does I-10 EB over Mobile Bay * US 90 carry?

About 32,384 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is I-10 EB over Mobile Bay * US 90?

The structure is 39,728 ft (12,109.1 m) long with a longest span of 154 ft (46.9 m) and a deck 42 ft wide.

Who owns I-10 EB over Mobile Bay * US 90?

It is owned by the State Highway Agency.