US Bridges

Richardson RD over Grappe Bayou

Good

Grant Parish, Louisiana · 0.21 Mi. West of US 71 · Structure no. 082231338924411

Built
2007
18 years old
Condition
Good
inspected February 2023
Type
Culvert
Concrete
Length
31 ft
3 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

Richardson RD over Grappe Bayou is a concrete culvert carrying Richardson RD over Grappe Bayou in Grant Parish, Louisiana. It was built in 2007, so it is 18 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 100 vehicles a day, projected to reach 110 by 2042. The structure is 31 ft (9.4 m) long and 45 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesRichardson RD
CrossesGrappe Bayou
Location0.21 Mi. West of US 71
RouteCounty Highway 0
Coordinates31.56317, -92.7346
Functional classRural Local

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 inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span9 ft (2.7 m)
Deck width45 ft (13.7 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic110 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Richardson RD over Grappe Bayou built?

It was built in 2007, making it 18 years old in 2025.

What condition is Richardson RD 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 February 2023.

How much traffic does Richardson RD over Grappe Bayou carry?

About 100 vehicles per day (2022 count).

How long is Richardson RD over Grappe Bayou?

The structure is 31 ft (9.4 m) long with a longest span of 9 ft (2.7 m) and a deck 45 ft wide.

Who owns Richardson RD over Grappe Bayou?

It is owned by the County Highway Agency.