US Bridges

I0310 over LA 3127 & I-310

Fair

St. Charles Parish, Louisiana · 2.9 MI East of LA 3160 · Structure no. 024504280310815

Built
1986
39 years old
Condition
Fair
inspected September 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
3,300 ft
2 main spans
Daily traffic
15,642
2021 count
Owner
State
State Highway Agency

About this bridge

I0310 over LA 3127 & I-310 is a steel continuous girder and floorbeam system carrying I0310 over LA 3127 & I-310 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 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 15,642 vehicles a day, roughly 25% of them trucks, projected to reach 17,206 by 2041. The structure is 3,300 ft (1,005.8 m) long and 28 ft wide.

Location

Open in Google Maps
CarriesI0310
CrossesLA 3127 & I-310
Location2.9 MI East of LA 3160
RouteInterstate 310
CountySt. Charles Parish
StateLouisiana
Coordinates29.91755, -90.414
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.8 US tons
Inventory rating17.5 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+46 approach)
Design loadHS 20
Structure length3,300 ft (1,005.8 m)
Longest span205 ft (62.5 m)
Deck width28 ft (8.5 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,642 (2021)
Projected traffic17,206 by 2041
Trucks25%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$12.9 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I0310 over LA 3127 & I-310 built?

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

What condition is I0310 over LA 3127 & I-310 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 September 2023.

How much traffic does I0310 over LA 3127 & I-310 carry?

About 15,642 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is I0310 over LA 3127 & I-310?

The structure is 3,300 ft (1,005.8 m) long with a longest span of 205 ft (62.5 m) and a deck 28 ft wide.

Who owns I0310 over LA 3127 & I-310?

It is owned by the State Highway Agency.