US Bridges

I0310 over I310 SB to US90

Good

St. Charles Parish, Louisiana · 0.40 Mi. N. of US 90 · Structure no. 024504503803581

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

About this bridge

I0310 over I310 SB to US90 is a prestressed concrete stringer/multi-beam or girder carrying I0310 over I310 SB to US90 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 425 ft (129.5 m) long and 71 ft wide.

CarriesI0310
CrossesI310 SB to US90
Location0.40 Mi. N. of US 90
RouteInterstate 310
Coordinates29.90001, -90.4022
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating35.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5 (+3 approach)
Design loadHS 20
Structure length425 ft (129.5 m)
Longest span70 ft (21.3 m)
Deck width71 ft (21.6 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,204 (2021)
Projected traffic44,224 by 2041
Trucks25%
Lanes on structure4
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I0310 over I310 SB to US90 built?

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

What condition is I0310 over I310 SB to US90 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 May 2024.

How much traffic does I0310 over I310 SB to US90 carry?

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

How long is I0310 over I310 SB to US90?

The structure is 425 ft (129.5 m) long with a longest span of 70 ft (21.3 m) and a deck 71 ft wide.

Who owns I0310 over I310 SB to US90?

It is owned by the State Highway Agency.