US Bridges

LA0151 over Darbonne Bayou

PoorPosted for load

Lincoln Parish, Louisiana · 1.7 MI East of LA 563 · Structure no. 053100890804651

Built
1975
50 years old
Condition
Poor
inspected November 2023
Type
Slab
Concrete
Length
363 ft
19 main spans
Daily traffic
2,216
2021 count
Owner
State
State Highway Agency

About this bridge

LA0151 over Darbonne Bayou is a concrete slab carrying LA0151 over Darbonne Bayou in Lincoln Parish, Louisiana. It was built in 1975, so it is 50 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 2,216 vehicles a day, roughly 15% of them trucks, projected to reach 2,437 by 2041. The structure is 363 ft (110.6 m) long and 31 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesLA0151
CrossesDarbonne Bayou
Location1.7 MI East of LA 563
RouteState Highway 151
CountyLincoln Parish
StateLouisiana
Coordinates32.68848, -92.7089
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating19.6 US tons
Inventory rating15 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans19
Design loadHS 20
Structure length363 ft (110.6 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,216 (2021)
Projected traffic2,437 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.5 million
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0151 over Darbonne Bayou built?

It was built in 1975, making it 50 years old in 2025.

What condition is LA0151 over Darbonne Bayou in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2023.

How much traffic does LA0151 over Darbonne Bayou carry?

About 2,216 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is LA0151 over Darbonne Bayou?

The structure is 363 ft (110.6 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns LA0151 over Darbonne Bayou?

It is owned by the State Highway Agency.