US Bridges

LA0345 over Coulee Du Portage

Fair

St. Martin Parish, Louisiana · 2.7 MI South of LA 96 · Structure no. 035004010201001

Built
1962
63 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete
Length
60 ft
3 main spans
Daily traffic
1,319
2021 count
Owner
State
State Highway Agency

About this bridge

LA0345 over Coulee Du Portage is a concrete slab carrying LA0345 over Coulee Du Portage in St. Martin Parish, Louisiana. It was built in 1962, so it is 63 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 1,319 vehicles a day, roughly 12% of them trucks, projected to reach 1,450 by 2041. The structure is 60 ft (18.3 m) long and 30 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesLA0345
CrossesCoulee Du Portage
Location2.7 MI South of LA 96
RouteState Highway 345
CountySt. Martin Parish
StateLouisiana
Coordinates30.09154, -91.7769
Functional classRural Minor Collector

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.1 US tons
Inventory rating20 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,319 (2021)
Projected traffic1,450 by 2041
Trucks12%
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 LA0345 over Coulee Du Portage built?

It was built in 1962, making it 63 years old in 2025.

What condition is LA0345 over Coulee Du Portage 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 August 2024.

How much traffic does LA0345 over Coulee Du Portage carry?

About 1,319 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is LA0345 over Coulee Du Portage?

The structure is 60 ft (18.3 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns LA0345 over Coulee Du Portage?

It is owned by the State Highway Agency.