US Bridges

Roy RD over Logan Bayou

Good

Caddo Parish, Louisiana · 1.4 Mi. No. of LA 173 · Structure no. 040932343935081

Built
1982
43 years old
Condition
Good
inspected March 2023
Type
Slab
Concrete
Length
59 ft
3 main spans
Daily traffic
200
2019 count
Owner
County
County Highway Agency

About this bridge

Roy RD over Logan Bayou is a concrete slab carrying Roy RD over Logan Bayou in Caddo Parish, Louisiana. It was built in 1982, so it is 43 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 200 vehicles a day, projected to reach 220 by 2039. The structure is 59 ft (18 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesRoy RD
CrossesLogan Bayou
Location1.4 Mi. No. of LA 173
RouteCounty Highway 0
Coordinates32.57242, -93.84648
Functional classUrban Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length59 ft (18 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2019)
Projected traffic220 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Roy RD over Logan Bayou built?

It was built in 1982, making it 43 years old in 2025.

What condition is Roy RD over Logan 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 March 2023.

How much traffic does Roy RD over Logan Bayou carry?

About 200 vehicles per day (2019 count).

How long is Roy RD over Logan Bayou?

The structure is 59 ft (18 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns Roy RD over Logan Bayou?

It is owned by the County Highway Agency.