US Bridges

I0310 over Swamp

Good

St. Charles Parish, Louisiana · 0.01 M South of I-10 · Structure no. 024504503600005

Built
1992
33 years old
Condition
Good
inspected September 2023
Type
Slab
Concrete Continuous
Length
2,206 ft
30 main spans
Daily traffic
56,783
2021 count
Owner
State
State Highway Agency

About this bridge

I0310 over Swamp is a concrete continuous slab carrying I0310 over Swamp in St. Charles Parish, Louisiana. It was built in 1992, so it is 33 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 56,783 vehicles a day, roughly 25% of them trucks, projected to reach 62,461 by 2041. The structure is 2,206 ft (672.4 m) long and 35 ft wide.

CarriesI0310
CrossesSwamp
Location0.01 M South of I-10
RouteInterstate 310
Coordinates30.00741, -90.29759
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.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating38 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans30
Design loadHS 20
Structure length2,206 ft (672.4 m)
Longest span74 ft (22.6 m)
Deck width35 ft (10.6 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56,783 (2021)
Projected traffic62,461 by 2041
Trucks25%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
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 Swamp built?

It was built in 1992, making it 33 years old in 2025.

What condition is I0310 over Swamp 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 September 2023.

How much traffic does I0310 over Swamp carry?

About 56,783 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is I0310 over Swamp?

The structure is 2,206 ft (672.4 m) long with a longest span of 74 ft (22.6 m) and a deck 35 ft wide.

Who owns I0310 over Swamp?

It is owned by the State Highway Agency.