US Bridges

LA0680 over Coulee Du Portage

Good

Iberia Parish, Louisiana · 1.33 MI North of LA 86 · Structure no. 032308233101331

Built
1971
54 years old
Condition
Good
inspected August 2023
Type
Culvert
Concrete
Length
23 ft
3 main spans
Daily traffic
923
2021 count
Owner
State
State Highway Agency

About this bridge

LA0680 over Coulee Du Portage is a concrete culvert carrying LA0680 over Coulee Du Portage in Iberia Parish, Louisiana. It was built in 1971, so it is 54 years old, older 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 923 vehicles a day, roughly 9% of them trucks, projected to reach 1,015 by 2041. The structure is 23 ft (7 m) long and 53 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesLA0680
CrossesCoulee Du Portage
Location1.33 MI North of LA 86
RouteState Highway 680
Coordinates30.07613, -91.791
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length23 ft (7 m)
Longest span7 ft (2.1 m)
Deck width53 ft (16.2 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic923 (2021)
Projected traffic1,015 by 2041
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 LA0680 over Coulee Du Portage built?

It was built in 1971, making it 54 years old in 2025.

What condition is LA0680 over Coulee Du Portage 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 August 2023.

How much traffic does LA0680 over Coulee Du Portage carry?

About 923 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is LA0680 over Coulee Du Portage?

The structure is 23 ft (7 m) long with a longest span of 7 ft (2.1 m) and a deck 53 ft wide.

Who owns LA0680 over Coulee Du Portage?

It is owned by the State Highway Agency.