US Bridges

Milldale RD over Drainage Bayou

PoorPosted for load

East Baton Rouge Parish, Louisiana · 2.9 M W of LA 409 · Structure no. 611730396911731

Built
1959
66 years old
Condition
Poor
inspected June 2023
Type
Slab
Concrete
Length
58 ft
3 main spans
Daily traffic
377
2019 count
Owner
County
County Highway Agency

About this bridge

Milldale RD over Drainage Bayou is a concrete slab carrying Milldale RD over Drainage Bayou in East Baton Rouge 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 377 vehicles a day, projected to reach 414 by 2039. The structure is 58 ft (17.7 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesMilldale RD
CrossesDrainage Bayou
Location2.9 M W of LA 409
RouteCounty Highway 0
CountyEast Baton Rouge Parish
StateLouisiana
Coordinates30.66761, -91.01972
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
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating29.3 US tons
Inventory rating22.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 15
Structure length58 ft (17.7 m)
Longest span19 ft (5.8 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic377 (2019)
Projected traffic414 by 2039
Trucks—
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

OwnerCounty Highway Agency
Maintained byCounty 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$220,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Milldale RD over Drainage Bayou built?

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

What condition is Milldale RD over Drainage 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 June 2023.

How much traffic does Milldale RD over Drainage Bayou carry?

About 377 vehicles per day (2019 count).

How long is Milldale RD over Drainage Bayou?

The structure is 58 ft (17.7 m) long with a longest span of 19 ft (5.8 m) and a deck 28 ft wide.

Who owns Milldale RD over Drainage Bayou?

It is owned by the County Highway Agency.