US Bridges

Dyer Rd. over Blackwater Bayou

Good

East Baton Rouge Parish, Louisiana · 2.5 MI E of LA 67 · Structure no. 611700000000166

Built
2019
6 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete
Length
80 ft
4 main spans
Daily traffic
1,267
2024 count
Owner
County
County Highway Agency

About this bridge

Dyer Rd. over Blackwater Bayou is a concrete slab carrying Dyer Rd. over Blackwater Bayou in East Baton Rouge Parish, Louisiana. It was built in 2019, so it is 6 years old, younger than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,267 vehicles a day, projected to reach 1,393 by 2044. The structure is 80 ft (24.4 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesDyer Rd.
CrossesBlackwater Bayou
Location2.5 MI E of LA 67
RouteCounty Highway 0
CountyEast Baton Rouge Parish
StateLouisiana
Coordinates30.59786, -91.07951
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadGreater than HL 93
Structure length80 ft (24.4 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,267 (2024)
Projected traffic1,393 by 2044
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Dyer Rd. over Blackwater Bayou built?

It was built in 2019, making it 6 years old in 2025.

What condition is Dyer Rd. over Blackwater Bayou in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does Dyer Rd. over Blackwater Bayou carry?

About 1,267 vehicles per day (2024 count).

How long is Dyer Rd. over Blackwater Bayou?

The structure is 80 ft (24.4 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns Dyer Rd. over Blackwater Bayou?

It is owned by the County Highway Agency.