US Bridges

LA0599 over Bonne Idee

FairPosted for load

Morehouse Parish, Louisiana · 3.1 MI East of US 165 · Structure no. 053403283006811

Built
1957
68 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
135 ft
7 main spans
Daily traffic
268
2021 count
Owner
State
State Highway Agency

About this bridge

LA0599 over Bonne Idee is a wood or timber stringer/multi-beam or girder carrying LA0599 over Bonne Idee in Morehouse Parish, Louisiana. It was built in 1957, so it is 68 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 268 vehicles a day, roughly 15% of them trucks, projected to reach 294 by 2041. The structure is 135 ft (41.1 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLA0599
CrossesBonne Idee
Location3.1 MI East of US 165
RouteState Highway 599
CountyMorehouse Parish
StateLouisiana
Coordinates32.8515, -91.7037
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating22 US tons
Inventory rating15 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans7
Design loadH 15
Structure length135 ft (41.1 m)
Longest span19 ft (5.8 m)
Deck width26 ft (8 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic268 (2021)
Projected traffic294 by 2041
Trucks15%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$643,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0599 over Bonne Idee built?

It was built in 1957, making it 68 years old in 2025.

What condition is LA0599 over Bonne Idee 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 December 2024.

How much traffic does LA0599 over Bonne Idee carry?

About 268 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is LA0599 over Bonne Idee?

The structure is 135 ft (41.1 m) long with a longest span of 19 ft (5.8 m) and a deck 26 ft wide.

Who owns LA0599 over Bonne Idee?

It is owned by the State Highway Agency.