US Bridges

LA3131 over Portage Canal

Fair

Pointe Coupee Parish, Louisiana · 5.3 MI N. of LA 78 · Structure no. 613908392401031

Built
1970
55 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete
Length
100 ft
5 main spans
Daily traffic
10,317
2021 count
Owner
State
State Highway Agency

About this bridge

LA3131 over Portage Canal is a concrete slab carrying LA3131 over Portage Canal in Pointe Coupee Parish, Louisiana. It was built in 1970, so it is 55 years old, older 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 10,317 vehicles a day, roughly 7% of them trucks, projected to reach 11,348 by 2041. The structure is 100 ft (30.5 m) long and 42 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesLA3131
CrossesPortage Canal
Location5.3 MI N. of LA 78
RouteState Highway 3131
CountyPointe Coupee Parish
StateLouisiana
Coordinates30.69429, -91.47211
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating79 US tons
Inventory rating48 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length100 ft (30.5 m)
Longest span20 ft (6.1 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,317 (2021)
Projected traffic11,348 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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 LA3131 over Portage Canal built?

It was built in 1970, making it 55 years old in 2025.

What condition is LA3131 over Portage Canal 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 2024.

How much traffic does LA3131 over Portage Canal carry?

About 10,317 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is LA3131 over Portage Canal?

The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.1 m) and a deck 42 ft wide.

Who owns LA3131 over Portage Canal?

It is owned by the State Highway Agency.