US Bridges

LA0158 over Grappe Bayou

Good

Grant Parish, Louisiana · 0.14 Mile South JCT US 71 · Structure no. 082200000080532

Built
2009
16 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
350 ft
5 main spans
Daily traffic
1,561
2021 count
Owner
State
State Highway Agency

About this bridge

LA0158 over Grappe Bayou is a prestressed concrete continuous stringer/multi-beam or girder carrying LA0158 over Grappe Bayou in Grant Parish, Louisiana. It was built in 2009, so it is 16 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 1,561 vehicles a day, roughly 14% of them trucks, projected to reach 1,717 by 2041. The structure is 350 ft (106.7 m) long and 43 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesLA0158
CrossesGrappe Bayou
Location0.14 Mile South JCT US 71
RouteState Highway 158
Coordinates31.54865, -92.7135
Functional classRural Major Collector

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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating56.1 US tons
Inventory rating32.5 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length350 ft (106.7 m)
Longest span70 ft (21.3 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,561 (2021)
Projected traffic1,717 by 2041
Trucks14%
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0158 over Grappe Bayou built?

It was built in 2009, making it 16 years old in 2025.

What condition is LA0158 over Grappe Bayou 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 2024.

How much traffic does LA0158 over Grappe Bayou carry?

About 1,561 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA0158 over Grappe Bayou?

The structure is 350 ft (106.7 m) long with a longest span of 70 ft (21.3 m) and a deck 43 ft wide.

Who owns LA0158 over Grappe Bayou?

It is owned by the State Highway Agency.