US Bridges

Waterplant Rd. over Terrebonne Bayou

PoorPosted for load

Terrebonne Parish, Louisiana · 0.01 E of LA 24 · Structure no. 025500000003660

Built
1959
66 years old
Condition
Poor
inspected March 2024
Type
Slab
Concrete
Length
57 ft
3 main spans
Daily traffic
280
2015 count
Owner
State
State Highway Agency

About this bridge

Waterplant Rd. over Terrebonne Bayou is a concrete slab carrying Waterplant Rd. over Terrebonne Bayou in Terrebonne Parish, Louisiana. It was built in 1959, so it is 66 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 280 vehicles a day, roughly 11% of them trucks, projected to reach 308 by 2035. The structure is 57 ft (17.4 m) long and 29 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesWaterplant Rd.
CrossesTerrebonne Bayou
Location0.01 E of LA 24
RouteState Highway 24
CountyTerrebonne Parish
StateLouisiana
Coordinates29.72694, -90.80142
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating16.1 US tons
Inventory rating12.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 15
Structure length57 ft (17.4 m)
Longest span20 ft (6.1 m)
Deck width29 ft (8.9 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic280 (2015)
Projected traffic308 by 2035
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$312,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Waterplant Rd. over Terrebonne Bayou built?

It was built in 1959, making it 66 years old in 2025.

What condition is Waterplant Rd. over Terrebonne 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 March 2024.

How much traffic does Waterplant Rd. over Terrebonne Bayou carry?

About 280 vehicles per day (2015 count), of which roughly 11% are trucks.

How long is Waterplant Rd. over Terrebonne Bayou?

The structure is 57 ft (17.4 m) long with a longest span of 20 ft (6.1 m) and a deck 29 ft wide.

Who owns Waterplant Rd. over Terrebonne Bayou?

It is owned by the State Highway Agency.