US Bridges

Allen Mann RD over Drain to Darbonne Lake

Fair

Union Parish, Louisiana · .7 Mi. SE Int. 343 · Structure no. 055632422922251

Built
1983
42 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete
Length
95 ft
5 main spans
Daily traffic
317
2019 count
Owner
County
County Highway Agency

About this bridge

Allen Mann RD over Drain to Darbonne Lake is a concrete slab carrying Allen Mann RD over Drain to Darbonne Lake in Union Parish, Louisiana. It was built in 1983, so it is 42 years old, younger 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 317 vehicles a day, projected to reach 348 by 2039. The structure is 95 ft (29 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesAllen Mann RD
CrossesDrain to Darbonne Lake
Location.7 Mi. SE Int. 343
RouteCounty Highway 0
CountyUnion Parish
StateLouisiana
Coordinates32.70311, -92.3744
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating36.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans5
Design loadHS 20
Structure length95 ft (29 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 traffic317 (2019)
Projected traffic348 by 2039
Trucks—
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Allen Mann RD over Drain to Darbonne Lake built?

It was built in 1983, making it 42 years old in 2025.

What condition is Allen Mann RD over Drain to Darbonne Lake 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 January 2024.

How much traffic does Allen Mann RD over Drain to Darbonne Lake carry?

About 317 vehicles per day (2019 count).

How long is Allen Mann RD over Drain to Darbonne Lake?

The structure is 95 ft (29 m) long with a longest span of 19 ft (5.8 m) and a deck 27 ft wide.

Who owns Allen Mann RD over Drain to Darbonne Lake?

It is owned by the County Highway Agency.