US Bridges

Lake Irwin RD over Little Lake Lafourche

Poor

Morehouse Parish, Louisiana · 8.9 MI SW of LA 134 · Structure no. 053432316914751

Built
1999
26 years old
Condition
Poor
inspected September 2024
Type
Slab
Concrete
Length
247 ft
13 main spans
Daily traffic
280
1979 count
Owner
County
County Highway Agency

About this bridge

Lake Irwin RD over Little Lake Lafourche is a concrete slab carrying Lake Irwin RD over Little Lake Lafourche in Morehouse Parish, Louisiana. It was built in 1999, so it is 26 years old, younger 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.

It carries about 280 vehicles a day, projected to reach 308 by 1999. The structure is 247 ft (75.3 m) long and 27 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesLake Irwin RD
CrossesLittle Lake Lafourche
Location8.9 MI SW of LA 134
RouteCounty Highway 0
Coordinates32.52634, -91.87126
Functional classRural Minor Arterial

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.4 US tons
Inventory rating46.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans13
Design loadHS 20
Structure length247 ft (75.3 m)
Longest span19 ft (5.8 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic280 (1979)
Projected traffic308 by 1999
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 Lake Irwin RD over Little Lake Lafourche built?

It was built in 1999, making it 26 years old in 2025.

What condition is Lake Irwin RD over Little Lake Lafourche 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 September 2024.

How much traffic does Lake Irwin RD over Little Lake Lafourche carry?

About 280 vehicles per day (1979 count).

How long is Lake Irwin RD over Little Lake Lafourche?

The structure is 247 ft (75.3 m) long with a longest span of 19 ft (5.8 m) and a deck 27 ft wide.

Who owns Lake Irwin RD over Little Lake Lafourche?

It is owned by the County Highway Agency.