US Bridges

I0310 over LA 3127

Fair

St. Charles Parish, Louisiana · 1.57 Mi. N. of US 90 · Structure no. 024504503802411

Built
1986
39 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
2,523 ft
5 main spans
Daily traffic
40,204
2021 count
Owner
State
State Highway Agency

About this bridge

I0310 over LA 3127 is a prestressed concrete stringer/multi-beam or girder carrying I0310 over LA 3127 in St. Charles Parish, Louisiana. It was built in 1986, so it is 39 years old, younger than the Louisiana average of 43 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 40,204 vehicles a day, roughly 25% of them trucks, projected to reach 44,224 by 2041. The structure is 2,523 ft (769 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesI0310
CrossesLA 3127
Location1.57 Mi. N. of US 90
RouteInterstate 310
CountySt. Charles Parish
StateLouisiana
Coordinates29.9155, -90.40715
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5 (+41 approach)
Design loadHS 20
Structure length2,523 ft (769 m)
Longest span124 ft (37.8 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,204 (2021)
Projected traffic44,224 by 2041
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I0310 over LA 3127 built?

It was built in 1986, making it 39 years old in 2025.

What condition is I0310 over LA 3127 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 May 2024.

How much traffic does I0310 over LA 3127 carry?

About 40,204 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is I0310 over LA 3127?

The structure is 2,523 ft (769 m) long with a longest span of 124 ft (37.8 m) and a deck 43 ft wide.

Who owns I0310 over LA 3127?

It is owned by the State Highway Agency.