US Bridges

I0310 over S.P. R.R. & LA-631

Good

St. Charles Parish, Louisiana · .50 MI N. of US 90 · Structure no. 024504503803667

Built
1986
39 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,534 ft
7 main spans
Daily traffic
40,204
2021 count
Owner
State
State Highway Agency

About this bridge

I0310 over S.P. R.R. & LA-631 is a prestressed concrete stringer/multi-beam or girder carrying I0310 over S.P. R.R. & LA-631 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 40,204 vehicles a day, roughly 25% of them trucks, projected to reach 44,224 by 2041. The structure is 1,534 ft (467.6 m) long and 28 ft wide.

Location

Open in Google Maps
CarriesI0310
CrossesS.P. R.R. & LA-631
Location.50 MI N. of US 90
RouteInterstate 310
CountySt. Charles Parish
StateLouisiana
Coordinates29.89901, -90.4015
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7 (+18 approach)
Design loadHS 20
Structure length1,534 ft (467.6 m)
Longest span111 ft (33.8 m)
Deck width28 ft (8.5 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,204 (2021)
Projected traffic44,224 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I0310 over S.P. R.R. & LA-631 built?

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

What condition is I0310 over S.P. R.R. & LA-631 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.

How much traffic does I0310 over S.P. R.R. & LA-631 carry?

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

How long is I0310 over S.P. R.R. & LA-631?

The structure is 1,534 ft (467.6 m) long with a longest span of 111 ft (33.8 m) and a deck 28 ft wide.

Who owns I0310 over S.P. R.R. & LA-631?

It is owned by the State Highway Agency.